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From: Laurence Lundblade <lgl@island-resort.com>
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Date: Wed, 1 Jul 2020 18:46:58 -0700
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Cc: "rats@ietf.org" <rats@ietf.org>
To: Dave Thaler <dthaler=40microsoft.com@dmarc.ietf.org>
References: <878E068C-DAFD-4441-94F7-BA79CAF7FED6@island-resort.com> <BL0PR2101MB10279501A4ECA5BB7B6AED63A36F0@BL0PR2101MB1027.namprd21.prod.outlook.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/LjO-KkNZ6UzElgRWyxfJHslgS7U>
Subject: Re: [Rats] Verifier Input instead of Endorsement?
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Here=E2=80=99s rough proposed text and diagram. Not sure where it would =
go in the doc yet.

LL

          *******************   ************     ****************
          * Manufacturer(s) *   * Verifier *     * Relying Party*
          *******************   *  Owner   *     *  Owner       *
                       |        ************     ****************
                       |              |                 |
          Manufacturer |              |                 |
              Verifier |              |Owner            |
                Input  |              |Verifier         |
                       |              |Input            | Appraisal
                       |              |                 | Policy for
                       |              |                 | Attestation
                       |              |                 |  Result
                       v              v                 |
                     .-----------------.                |
              .----->|     Verifier    |------.         |
              |      '-----------------'      |         |
              |                               |         |
              |                    Attestation|         |
              |                    Results    |         |
              | Evidence                      |         |
              |                               |         |
              |                               v         v
        .----------.                      .-----------------.
        | Attester |                      | Relying Party   |
        '----------'                      '=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=98

Conceptually there are four main inputs to the Verifier aside from the =
Attestation Evidence. They are:

   - Key material for verifying trust in the Attester
   - Known-good/reference values for comparison with Claims in the =
Attestation Evidence
   - Static implicit claims for the particular Attester that are pass to =
the Relying Party in Attestation Results
   - Policy Configuration

Any of these four can come from either the Manufacturer as Manufacturer =
Verifier Input or from the Verifier Owner as Owner Verifier Input. They =
key material usually always comes from the manufacturer and the policy =
from the Verifier Owner, but there is no strict requirement for this. =
The known-good/reference values and static implicit claims often come =
from either or both.=20

There is no strict separation between Manufacturer and Verifier Owner. =
They could be the same. There could also be 3rd party intermediaries =
between the Manufacturer and the Verifier.

An Endorsement is one established format for some of these inputs. It =
usually comes from an Endorser that is usually the Manufacturer. It is =
usually a signed document. Alternatively, the Verifier may perform =
queries against a database, perhaps one maintained by a Manufacturer, to =
get inputs. Alternatively, the root key of a key hierarchy may be =
transferred in a one-time physical ceremony. This architecture sets no =
protocol or procedure for this input.

The transfer of all these inputs to the Verifier does need to be =
secured. For all cases, authenticity of the Manufacturer and Verifier =
Owner and their inputs are required. Without authentic inputs, the =
Verifier will not do its job correctly. In some cases confidentiality of =
the inputs is required. Finally, in some cases the Manufacturer and =
Verifier Owner will authenticate the Verifier.

This architecture sets no requirement for a particular protocol or =
security mechanism. For example, TLS could be used, but it is not the =
only protocol that could be used,




> On Jun 29, 2020, at 8:56 PM, Dave Thaler =
<dthaler=3D40microsoft.com@dmarc.ietf.org> wrote:
>=20
> I don=E2=80=99t like the term =E2=80=9CVerifier Input=E2=80=9D since =
=E2=80=9CAppraisal Policy for Evidence=E2=80=9D is also Verifier Input, =
so I would find it confusing.
> I think that the rules for what to put in Attestation Results (bullet =
3), as well as =E2=80=9Cknown-good/reference values=E2=80=9D if such =
exist
> (and there can be valid policies where they may not exist, or rather =
where the policies use more complex rules than
> a simple test for equality against a constant) are conceptually part =
of Appraisal Policy.
> =20
> I do agree that Appraisal Policy can be conveyed to the Verifier in =
many different ways, and may be composed
> of different things from different sources.
> =20
> Dave
> =20
> From: RATS <rats-bounces@ietf.org> On Behalf Of Laurence Lundblade
> Sent: Monday, June 29, 2020 11:34 AM
> To: rats@ietf.org
> Subject: [Rats] Verifier Input instead of Endorsement?
> =20
> Stepping back a bit on the definition of an Endorsement, I think the =
four inputs to a Verifier are these:
>   - Key material for verifying trust in the Attester
>   - Known-good/Reference values for comparison with claims
>   - Static implicit claims that are passed to RP's via Attestation =
Results
>   - Appraisal Policy
> =20
> These can and will be conveyed to the Verifier in many different ways:
>   - X.509 certs with extensions
>   - Signed documents
>   - HTTP queries against the Attester/device manufacturer
>   - Remote SQL or some other sort of database access to =
manufacturer(s)
>   - Data storage like flash drives the are hand carried into the =
Verifier's site
>   - One-time special file transfers
>   - Ceremonial procedures with M out of N people physical present =
approving transfer
> =20
> It seems like shoe-horning all of the above (except policy) into an =
Endorsement, like I=E2=80=99ve tried to do =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0>  is too much. I tried this =
shoe-horning because I think the architecture document needs to cover =
all this and Endorsements was what was in it. A typical Endorsement =
seems to be just the first two mentioned, X.509 and signed documents =
expanding its definition to include database access is a stretch.
> =20
> Rather than defining Endorsement, I=E2=80=99d like to define Verifier =
Input:
> =20
>           *******************   ************     ****************
>           * Manufacturer(s) *   * Verifier *     * Relying Party*
>           *******************   *  Owner   *     *  Owner       *
>                        |        ************     ****************
>                        |              |                 |
>          Verifier Input|              |                 |
>                        |              |Appraisal        |
>                        |              |Policy           |
>                        |              |for              | Appraisal
>                        |              |Evidence         | Policy for
>                        |              |                 | Attestation
>                        |              |                 |  Result
>                        v              v                 |
>                      .-----------------.                |
>               .----->|     Verifier    |------.         |
>               |      '-----------------'      |         |
>               |                               |         |
>               |                    Attestation|         |
>               |                    Results    |         |
>               | Evidence                      |         |
>               |                               |         |
>               |                               v         v
>         .----------.                      .-----------------.
>         | Attester |                      | Relying Party   |
>         '----------'                      '=E2=80=94=E2=80=94=E2=80=94=E2=
=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=98
> =20
> =20
>=20
> Endorsements must still be mentioned, but as one form of Verifier =
input just like EAT is one form of Attestation Evidence.
> =20
> Verifier Input would be defined as:
>   - Key material for verifying trust in the Attester
>   - Known-good/Reference values for comparison with claims
>   - Static implicit claims that are passed to RP's via Attestation =
Results
> =20
> To do this, I=E2=80=99d replace the current PR =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0> and issue =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&data=3D02%7C01%7Cdthaler=
%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab=
2d7cd011db47%7C1%7C0%7C637290524986375092&sdata=3DGfM5qElO4teNdjfABlmVayeG=
XuYHWBDqHTVtpeeew7g%3D&reserved=3D0> I have on Endorsements with a new =
PR. It will be a fair bit of work, so I want to see if there is some =
consensus first.
> =20
> LL
> =20
> =20
> =20
> =20
> =20
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D""><div class=3D"">Here=E2=80=99s rough proposed text and =
diagram. Not sure where it would go in the doc yet.</div></div><div =
class=3D""><br class=3D""></div><div class=3D"">LL</div><div =
class=3D""><br class=3D""></div><div class=3D""><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
******************* &nbsp; ************ &nbsp; &nbsp; =
****************</font></div><div class=3D""><font face=3D"Courier New" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; * Manufacturer(s) * &nbsp; =
* Verifier * &nbsp; &nbsp; * Relying Party*</font></div><div =
class=3D""><font face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; ******************* &nbsp; * &nbsp;Owner &nbsp; * &nbsp; =
&nbsp; * &nbsp;Owner &nbsp; &nbsp; &nbsp; *</font></div><div =
class=3D""><font face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp;************ &nbsp; &nbsp; =
****************</font></div><div class=3D""><font face=3D"Courier New" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
|</font></div><div class=3D""><font face=3D"Courier New" class=3D"">&nbsp;=
 &nbsp; &nbsp; &nbsp; &nbsp; Manufacturer | &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; |</font></div><div class=3D""><font face=3D"Courier New" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Verifier | =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Owner &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;|</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; Input &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|Verifier &nbsp; &nbsp; &nbsp; &nbsp; |</font></div><div =
class=3D""><font face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Input &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;| Appraisal</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | Policy for</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | Attestation</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | &nbsp;Result</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;v &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;v &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; |</font></div><div class=3D""><font face=3D"Courier New" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;.-----------------. &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;|</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; .-----&gt;| &nbsp; &nbsp; Verifier &nbsp; &nbsp;|------. =
&nbsp; &nbsp; &nbsp; &nbsp; |</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | &nbsp; &nbsp; &nbsp;'-----------------' &nbsp; &nbsp; =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; |</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; =
&nbsp; |</font></div><div class=3D""><font face=3D"Courier New" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;Attestation| &nbsp; &nbsp; &nbsp; &nbsp; |</font></div><div =
class=3D""><font face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;Results &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; |</font></div><div class=3D""><font face=3D"Courier New" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | Evidence =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; |</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; =
&nbsp; |</font></div><div class=3D""><font face=3D"Courier New" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; v &nbsp; &nbsp; &nbsp; &nbsp; =
v</font></div><div class=3D""><font face=3D"Courier New" class=3D"">&nbsp;=
 &nbsp; &nbsp; &nbsp; .----------. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;.-----------------.</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; | Attester | =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| Relying Party &nbsp; |</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; '----------' =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;'=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=98</font></div></div><div class=3D""><br class=3D""></div><div =
class=3D"">Conceptually there are four main inputs to the Verifier aside =
from the Attestation Evidence. They are:</div><div class=3D""><br =
class=3D""></div><div class=3D"">&nbsp; &nbsp;- Key material for =
verifying trust in the Attester</div><div class=3D"">&nbsp; &nbsp;- =
Known-good/reference values for comparison with Claims in the =
Attestation Evidence</div><div class=3D"">&nbsp; &nbsp;- Static implicit =
claims for the particular Attester that are pass to the Relying Party in =
Attestation Results</div><div class=3D"">&nbsp; &nbsp;- Policy =
Configuration</div><div class=3D""><br class=3D""></div><div =
class=3D"">Any of these four can come from either the Manufacturer as =
Manufacturer Verifier Input or from the Verifier Owner as Owner Verifier =
Input. They key material usually always comes from the manufacturer and =
the policy from the Verifier Owner, but there is no strict requirement =
for this. The known-good/reference values and static implicit claims =
often come from either or both.&nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D"">There is no strict separation between =
Manufacturer and Verifier Owner. They could be the same. There could =
also be 3rd party intermediaries between the Manufacturer and the =
Verifier.</div><div class=3D""><br class=3D""></div><div class=3D"">An =
Endorsement is one established format for some of these inputs. It =
usually comes from an Endorser that is usually the Manufacturer. It is =
usually a signed document. Alternatively, the Verifier may perform =
queries against a database, perhaps one maintained by a Manufacturer, to =
get inputs. Alternatively, the root key of a key hierarchy may be =
transferred in a one-time physical ceremony. This architecture sets no =
protocol or procedure for this input.</div><div class=3D""><br =
class=3D""></div><div class=3D"">The transfer of all these inputs to the =
Verifier does need to be secured. For all cases, authenticity of the =
Manufacturer and Verifier Owner and their inputs are required. Without =
authentic inputs, the Verifier will not do its job correctly. In some =
cases confidentiality of the inputs is required. Finally, in some cases =
the Manufacturer and Verifier Owner will authenticate the =
Verifier.</div><div class=3D""><br class=3D""></div><div class=3D"">This =
architecture sets no requirement for a particular protocol or security =
mechanism. For example, TLS could be used, but it is not the only =
protocol that could be used,</div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">On Jun 29, 2020, at 8:56 PM, Dave Thaler =
&lt;<a href=3D"mailto:dthaler=3D40microsoft.com@dmarc.ietf.org" =
class=3D"">dthaler=3D40microsoft.com@dmarc.ietf.org</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">I don=E2=80=99t like =
the term =E2=80=9CVerifier Input=E2=80=9D since =E2=80=9CAppraisal =
Policy for Evidence=E2=80=9D is also Verifier Input, so I would find it =
confusing.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">I think that the rules =
for what to put in Attestation Results (bullet 3), as well as =
=E2=80=9Cknown-good/reference values=E2=80=9D if such exist<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">(and there can be valid =
policies where they may not exist, or rather where the policies use more =
complex rules than<o:p class=3D""></o:p></span></div><div style=3D"margin:=
 0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">a =
simple test for equality against a constant) are conceptually part of =
Appraisal Policy.<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">I =
do agree that Appraisal Policy can be conveyed to the Verifier in many =
different ways, and may be composed<o:p class=3D""></o:p></span></div><div=
 style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">of different things from different sources.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Dave<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div class=3D""><div =
style=3D"border-style: solid none none; border-top-width: 1pt; =
border-top-color: rgb(225, 225, 225); padding: 3pt 0in 0in;" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><b =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">From:</span></b><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>RATS &lt;<a =
href=3D"mailto:rats-bounces@ietf.org" =
class=3D"">rats-bounces@ietf.org</a>&gt;<span =
class=3D"Apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>Laurence =
Lundblade<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Monday, June 29, 2020 11:34 =
AM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:rats@ietf.org" class=3D"">rats@ietf.org</a><br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>[Rats] Verifier Input =
instead of Endorsement?<o:p class=3D""></o:p></span></div></div></div><div=
 style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D"">Stepping back a bit on the definition of an Endorsement, I =
think the four inputs to a Verifier are these:<br class=3D"">&nbsp; - =
Key material for verifying trust in the Attester<br class=3D"">&nbsp; - =
Known-good/Reference values for comparison with claims<br =
class=3D"">&nbsp; - Static implicit claims that are passed to RP's via =
Attestation Results<br class=3D"">&nbsp; - Appraisal Policy<o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">These can =
and will be conveyed to the Verifier in many different ways:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">&nbsp; - X.509 certs with extensions<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">&nbsp; - Signed documents<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">&nbsp; - HTTP queries against the Attester/device =
manufacturer<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D"">&nbsp; - Remote SQL or =
some other sort of database access to manufacturer(s)<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">&nbsp; - Data storage like flash drives the are hand =
carried into the Verifier's site<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">&nbsp; - =
One-time special file transfers<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">&nbsp; - =
Ceremonial procedures with M out of N people physical present approving =
transfer<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">It seems like shoe-horning all of the =
above (except policy) into an Endorsement,&nbsp;<a =
href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C01%=
7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f=
141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2B3L=
JXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0" style=3D"color: =
purple; text-decoration: underline;" class=3D"">like I=E2=80=99ve tried =
to do</a>&nbsp; is too much. I tried this shoe-horning because I think =
the architecture document needs to cover all this and Endorsements was =
what was in it. A typical Endorsement seems to be just the first two =
mentioned, X.509 and signed documents expanding its definition to =
include database access is a stretch.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">Rather than =
defining Endorsement, I=E2=80=99d like to define Verifier Input:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ******************* &nbsp; =
************ &nbsp; &nbsp; ****************</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; * Manufacturer(s) * &nbsp; =
* Verifier * &nbsp; &nbsp; * Relying Party*</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ******************* &nbsp; =
* &nbsp;Owner &nbsp; * &nbsp; &nbsp; * &nbsp;Owner &nbsp; &nbsp; &nbsp; =
*</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| =
&nbsp; &nbsp; &nbsp; &nbsp;************ &nbsp; &nbsp; =
****************</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Verifier Input| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; |</span><o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Appraisal &nbsp; &nbsp; =
&nbsp; &nbsp;|</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Policy &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; |</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|for &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| Appraisal</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;|Evidence &nbsp; &nbsp; &nbsp; &nbsp; | Policy for</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | =
Attestation</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp;Result</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;v &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;v &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
|</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;.-----------------. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .-----&gt;| &nbsp; &nbsp; Verifier =
&nbsp; &nbsp;|------. &nbsp; &nbsp; &nbsp; &nbsp; |</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp;'-----------------' &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; =
&nbsp; &nbsp; |</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | =
&nbsp; &nbsp; &nbsp; &nbsp; |</span><o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Attestation| &nbsp; &nbsp; &nbsp; =
&nbsp; |</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Results &nbsp; &nbsp;| &nbsp; &nbsp; =
&nbsp; &nbsp; |</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | Evidence &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; =
&nbsp; &nbsp; |</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | =
&nbsp; &nbsp; &nbsp; &nbsp; |</span><o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; v =
&nbsp; &nbsp; &nbsp; &nbsp; v</span><o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; .----------. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;.-----------------.</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; | Attester | &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| Relying Party =
&nbsp; |</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; '----------' &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;'=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=98</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><p class=3D"MsoNormal" style=3D"margin:=
 0in 0in 12pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;"><o:p class=3D"">&nbsp;</o:p></p></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">Endorsements =
must still be mentioned, but as one form of Verifier input just like EAT =
is one form of Attestation Evidence.<o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">Verifier Input would be defined as:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">&nbsp; - Key material for verifying trust in the =
Attester<br class=3D"">&nbsp; - Known-good/Reference values for =
comparison with claims<br class=3D"">&nbsp; - Static implicit claims =
that are passed to RP's via Attestation Results<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">To do this, =
I=E2=80=99d replace the current&nbsp;<a =
href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C01%=
7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f=
141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2B3L=
JXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0" style=3D"color: =
purple; text-decoration: underline;" class=3D"">PR</a>&nbsp;and&nbsp;<a =
href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&amp;data=3D02%7C0=
1%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf8=
6f141af91ab2d7cd011db47%7C1%7C0%7C637290524986375092&amp;sdata=3DGfM5qElO4=
teNdjfABlmVayeGXuYHWBDqHTVtpeeew7g%3D&amp;reserved=3D0" style=3D"color: =
purple; text-decoration: underline;" class=3D"">issue</a>&nbsp;I have on =
Endorsements with a new PR. It will be a fair bit of work, so I want to =
see if there is some consensus first.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">LL<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div></div><span style=3D"caret-color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">_______________________________________________</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">RATS mailing list</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D""><a href=3D"mailto:RATS@ietf.org" =
class=3D"">RATS@ietf.org</a></span><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/rats" =
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ockquote></div><br class=3D""></body></html>=

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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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Hi Laurence,

while I think that I understand where you are coming from here, I have 
to say that I also think that:

* "manufacturer(s)" is a too arbitrarily restricting term, which is why 
we agreed on endorser
* every arrow is of course "input/output", but we are not calling 
evidence "Attester Output". So, Verifier Input is in contrast a too 
ambiguous category (it does not add any semantics to the arrow)
* the itemized list that starts with key material provides a very 
intuitive example and maybe we could use that kind of list as a more 
prominent example in the arch I-D

The question, if reference values are endorsements or appraisal policies 
or a third item is... probably okay and I am interested in an answer - 
but that is a detail, I think. As long as they are also mentioned, I can 
follow all three lines of thought.

Also, I am in strong doubt that the following statement is always 
correct: "The transfer of all these inputs to the Verifier does need to 
be secured.". I am confused by the exceptions that follow that statement 
which basically say, I think: in some cases they have to be secured. 
Maybe we mean different things by "secured"?

Viele Grüße,

Henk

On 02.07.20 03:46, Laurence Lundblade wrote:
> Here’s rough proposed text and diagram. Not sure where it would go in 
> the doc yet.
> 
> LL
> 
>            *******************   ************     ****************
>            * Manufacturer(s) *   * Verifier *     * Relying Party*
>            *******************   *  Owner   *     *  Owner       *
>                         |        ************     ****************
>                         |              |                 |
>            Manufacturer |              |                 |
>                Verifier |              |Owner            |
>                  Input  |              |Verifier         |
>                         |              |Input            | Appraisal
>                         |              |                 | Policy for
>                         |              |                 | Attestation
>                         |              |                 |  Result
>                         v              v                 |
>                       .-----------------.                |
>                .----->|     Verifier    |------.         |
>                |      '-----------------'      |         |
>                |                               |         |
>                |                    Attestation|         |
>                |                    Results    |         |
>                | Evidence                      |         |
>                |                               |         |
>                |                               v         v
>          .----------.                      .-----------------.
>          | Attester |                      | Relying Party   |
>          '----------'                      '————————‘
> 
> Conceptually there are four main inputs to the Verifier aside from the 
> Attestation Evidence. They are:
> 
>     - Key material for verifying trust in the Attester
>     - Known-good/reference values for comparison with Claims in the 
> Attestation Evidence
>     - Static implicit claims for the particular Attester that are pass 
> to the Relying Party in Attestation Results
>     - Policy Configuration
> 
> Any of these four can come from either the Manufacturer as Manufacturer 
> Verifier Input or from the Verifier Owner as Owner Verifier Input. They 
> key material usually always comes from the manufacturer and the policy 
> from the Verifier Owner, but there is no strict requirement for this. 
> The known-good/reference values and static implicit claims often come 
> from either or both.
> 
> There is no strict separation between Manufacturer and Verifier Owner. 
> They could be the same. There could also be 3rd party intermediaries 
> between the Manufacturer and the Verifier.
> 
> An Endorsement is one established format for some of these inputs. It 
> usually comes from an Endorser that is usually the Manufacturer. It is 
> usually a signed document. Alternatively, the Verifier may perform 
> queries against a database, perhaps one maintained by a Manufacturer, to 
> get inputs. Alternatively, the root key of a key hierarchy may be 
> transferred in a one-time physical ceremony. This architecture sets no 
> protocol or procedure for this input.
> 
> The transfer of all these inputs to the Verifier does need to be 
> secured. For all cases, authenticity of the Manufacturer and Verifier 
> Owner and their inputs are required. Without authentic inputs, the 
> Verifier will not do its job correctly. In some cases confidentiality of 
> the inputs is required. Finally, in some cases the Manufacturer and 
> Verifier Owner will authenticate the Verifier.
> 
> This architecture sets no requirement for a particular protocol or 
> security mechanism. For example, TLS could be used, but it is not the 
> only protocol that could be used,
> 
> 
> 
> 
>> On Jun 29, 2020, at 8:56 PM, Dave Thaler 
>> <dthaler=40microsoft.com@dmarc.ietf.org 
>> <mailto:dthaler=40microsoft.com@dmarc.ietf.org>> wrote:
>>
>> I don’t like the term “Verifier Input” since “Appraisal Policy for 
>> Evidence” is also Verifier Input, so I would find it confusing.
>> I think that the rules for what to put in Attestation Results (bullet 
>> 3), as well as “known-good/reference values” if such exist
>> (and there can be valid policies where they may not exist, or rather 
>> where the policies use more complex rules than
>> a simple test for equality against a constant) are conceptually part 
>> of Appraisal Policy.
>> I do agree that Appraisal Policy can be conveyed to the Verifier in 
>> many different ways, and may be composed
>> of different things from different sources.
>> Dave
>> *From:*RATS <rats-bounces@ietf.org <mailto:rats-bounces@ietf.org>>*On 
>> Behalf Of*Laurence Lundblade
>> *Sent:*Monday, June 29, 2020 11:34 AM
>> *To:*rats@ietf.org <mailto:rats@ietf.org>
>> *Subject:*[Rats] Verifier Input instead of Endorsement?
>> Stepping back a bit on the definition of an Endorsement, I think the 
>> four inputs to a Verifier are these:
>>   - Key material for verifying trust in the Attester
>>   - Known-good/Reference values for comparison with claims
>>   - Static implicit claims that are passed to RP's via Attestation Results
>>   - Appraisal Policy
>> These can and will be conveyed to the Verifier in many different ways:
>>   - X.509 certs with extensions
>>   - Signed documents
>>   - HTTP queries against the Attester/device manufacturer
>>   - Remote SQL or some other sort of database access to manufacturer(s)
>>   - Data storage like flash drives the are hand carried into the 
>> Verifier's site
>>   - One-time special file transfers
>>   - Ceremonial procedures with M out of N people physical present 
>> approving transfer
>> It seems like shoe-horning all of the above (except policy) into an 
>> Endorsement, like I’ve tried to do 
>> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=02%7C01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&sdata=2NktPX%2B3LJXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&reserved=0>  
>> is too much. I tried this shoe-horning because I think the 
>> architecture document needs to cover all this and Endorsements was 
>> what was in it. A typical Endorsement seems to be just the first two 
>> mentioned, X.509 and signed documents expanding its definition to 
>> include database access is a stretch.
>> Rather than defining Endorsement, I’d like to define Verifier Input:
>>           *******************   ************     ****************
>>           * Manufacturer(s) *   * Verifier *     * Relying Party*
>>           *******************   *  Owner   *     *  Owner       *
>>                        |        ************     ****************
>>                        |              |                 |
>>          Verifier Input|              |                 |
>>                        |              |Appraisal        |
>>                        |              |Policy           |
>>                        |              |for              | Appraisal
>>                        |              |Evidence         | Policy for
>>                        |              |                 | Attestation
>>                        |              |                 |  Result
>>                        v              v                 |
>>                      .-----------------.                |
>>               .----->|     Verifier    |------.         |
>>               |      '-----------------'      |         |
>>               |                               |         |
>>               |                    Attestation|         |
>>               |                    Results    |         |
>>               | Evidence                      |         |
>>               |                               |         |
>>               |                               v         v
>>         .----------.                      .-----------------.
>>         | Attester |                      | Relying Party   |
>>         '----------'                      '————————‘
>>
>> Endorsements must still be mentioned, but as one form of Verifier 
>> input just like EAT is one form of Attestation Evidence.
>> Verifier Input would be defined as:
>>   - Key material for verifying trust in the Attester
>>   - Known-good/Reference values for comparison with claims
>>   - Static implicit claims that are passed to RP's via Attestation Results
>> To do this, I’d replace the current PR 
>> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=02%7C01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&sdata=2NktPX%2B3LJXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&reserved=0> and 
>> issue 
>> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&data=02%7C01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986375092&sdata=GfM5qElO4teNdjfABlmVayeGXuYHWBDqHTVtpeeew7g%3D&reserved=0> I 
>> have on Endorsements with a new PR. It will be a fair bit of work, so 
>> I want to see if there is some consensus first.
>> LL
>> _______________________________________________
>> RATS mailing list
>> RATS@ietf.org <mailto:RATS@ietf.org>
>> https://www.ietf.org/mailman/listinfo/rats
> 
> 
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
> 


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To: Thomas Fossati <Thomas.Fossati@arm.com>, "rats@ietf.org" <rats@ietf.org>
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From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Hi Thomas,
hi authors,

please let me start with: I really like what this I-D is about; 
especially how everything is basically arranged around how to use 
timestamps and nonces in several specific interactions. The essence here 
is the qualified data conveyed via restful operations that are used to 
create Conceptual Messages, such as Evidence or Attestation Results.

The fact that all these different types of qualifying data are bound 
with each other via sequences of restful operations makes the 
relationship of the sequence diagrams rather complex and renders the use 
of the qualified data / handles hard to read. At the same time, I am 
uncertain how to avoid that, though.

You managed to get all the semantic relationships into the sequence 
diagrams themselves. I am quite impressed. But I could only decipher the 
notation while parsing them with the help of a little cheat sheet that I 
wrote down on a piece of paper.

This topic is intrinsically complex, so - as I already said - I am 
unable to provide an immediate proposal how to increase readability. The 
fact remains that this is a very useful -00 I-D. Suffice to say that I 
would rather have this content in this form than not at all!

Coincidentally, more generic versions of your diagrams with respect to 
the reference interaction models can be found in this editor's version:

> https://ietf-rats.github.io/draft-birkholz-rats-reference-interaction-model/draft-birkholz-rats-reference-interaction-model.html#name-interaction-models

These diagrams use simpler annotation, but therefore are also way more 
generic. They match with your more specific semantics, though, and I am 
very happy about that.

We also struggled a bit with the illustration of the processing of 
qualified data in TUDA and based on your new I-D we can now try to 
improve them.

Viele Grüße,

Henk


On 12.06.20 19:00, Thomas Fossati wrote:
> Hi, all,
> 
> We have just submitted a new draft "RESTful attested resources" (details
> below).
> 
> The main goal here is creating a mechanism to expose attested system
> state as RESTful resources (i.e., "things" that can be de-referenced by
> their URIs) together with a way to securely bind said system state with
> an EAT token.
> 
> We define two REST interfaces: one to the Attester and one to the
> Verifier, with timestamp- and nonce-based freshness.  We show how these
> can be composed into the usual "background check", "passport" and
> "time-based unidirectional" patterns.  HTTP and CoAP instantiations are
> provided, together with the associated MIME machinery.  A discovery
> method is also discussed based on the CoRE Resource Directory.
> 
> This proposal seems in scope with the RATS charter, in particular its
> "Standardize interoperable protocols to securely convey
> assertions/claims." bit.  We hope this provides a valid contribution on
> how the RATS architecture and basic protocol elements can be used in
> high level protocol(s), and would really appreciate any feedback with
> regards to its usefulness, correctness and completeness.
> 
> cheers, thanks!
> 
> On 12/06/2020, 17:48, "internet-drafts@ietf.org" <internet-drafts@ietf.org> wrote:
>> A new version of I-D, draft-shaw-rats-rear-00.txt
>> has been successfully submitted by Thomas Fossati and posted to the
>> IETF repository.
>>
>> Name:draft-shaw-rats-rear
>> Revision:00
>> Title:Restful Attested Resources
>> Document date:2020-06-12
>> Group:Individual Submission
>> Pages:23
>> URL:            https://www.ietf.org/internet-drafts/draft-shaw-rats-rear-00.txt
>> Status:         https://datatracker.ietf.org/doc/draft-shaw-rats-rear/
>> Htmlized:       https://tools.ietf.org/html/draft-shaw-rats-rear-00
>> Htmlized:       https://datatracker.ietf.org/doc/html/draft-shaw-rats-rear
>>
>>
>> Abstract:
>>     This memo describes a REST interface based on the RATS architecture
>>     that can be used to retrieve attested system state, for example the
>>     reading of a security critical sensor.  The objective is to present a
>>     common vocabulary of data formats and basic protocol transactions
>>     that can be pieced together into a cohesive interface that is capable
>>     of serving different attestation workflows.
> 
> 
> 
> 
> IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
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To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, "rats@ietf.org" <rats@ietf.org>
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Subject: Re: [Rats] FW: New Version Notification for draft-shaw-rats-rear-00.txt
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To: Thomas Fossati <Thomas.Fossati@arm.com>, "rats@ietf.org" <rats@ietf.org>
References: <159198048358.5204.2551532653126853410@ietfa.amsl.com> <9CB821D0-26D5-499C-9F60-CFF066AE6A87@arm.com> <045cab6d-16d0-d828-50cd-313f1a1affd7@sit.fraunhofer.de> <613BB736-C15F-44D1-848A-5554C9EE858C@arm.com>
From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Hi Thomas,

On 02.07.20 18:06, Thomas Fossati wrote:
> Hi Henk,
> 
> On 02/07/2020, 15:05, "Henk Birkholz" <henk.birkholz@sit.fraunhofer.de> wrote:
>> Hi Thomas,
>> hi authors,
>>
>> please let me start with: I really like what this I-D is about;
>> especially how everything is basically arranged around how to use
>> timestamps and nonces in several specific interactions. The essence
>> here is the qualified data conveyed via restful operations that are
>> used to create Conceptual Messages, such as Evidence or Attestation
>> Results.
>>
>> The fact that all these different types of qualifying data are bound
>> with each other via sequences of restful operations makes the
>> relationship of the sequence diagrams rather complex and renders the use
>> of the qualified data / handles hard to read. At the same time, I am
>> uncertain how to avoid that, though.
>>
>> You managed to get all the semantic relationships into the sequence
>> diagrams themselves. I am quite impressed. But I could only decipher the
>> notation while parsing them with the help of a little cheat sheet that I
>> wrote down on a piece of paper.
>>
>> This topic is intrinsically complex, so - as I already said - I am
>> unable to provide an immediate proposal how to increase readability. The
>> fact remains that this is a very useful -00 I-D. Suffice to say that I
>> would rather have this content in this form than not at all!
> 
> Thank you for your taking the time to parse the document - and making
> the cheat sheet!  Also glad you found the topic interesting.
> 
> Re: readability.  It seemed to us that it would be easier to use a
> top-down approach, presenting the abstract protocol first and then
> giving a number of possible instantiations.  Apparently it didn't work
> as smoothly as expected.  Maybe to lower the barriers to entry we could
> give a short primer at (one of) the next meeting(s)?

Yes, please. I think with floating this document more, we might get some 
additional hints and tips and, of course, feedback on how this currently 
addresses the needs of implementers. I'd encourage to request a slot for 
the upcoming IETF 108 sessions.

> 
>> Coincidentally, more generic versions of your diagrams with respect to
>> the reference interaction models can be found in this editor's version:
>>
>>> https://ietf-rats.github.io/draft-birkholz-rats-reference-interaction-model/draft-birkholz-rats-reference-interaction-model.html#name-interaction-models
>>
>> These diagrams use simpler annotation, but therefore are also way more
>> generic. They match with your more specific semantics, though, and I am
>> very happy about that.
> 
> Thanks for the pointer.  I like the more human-friendly notation.  I'll
> have a look and see if I can make our diagrams look similar.  I'm also
> going to swap our reference to TUDA with the more generic reference to
> your section 7.2 (Uni-Directional Remote Attestation).  When are you
> going to publish the new version?

That sounds great. With respect to submission... yes, we should do a 
submit soon and then another before the submission moratorium, if we are 
able to pull in the expected content about Direct Anonymous Attestation. 
Let me see, if I can do another pass on the relatively fresh and clumsy 
text around the diagrams in section 7, first.

Viele Grüße,

Henk

> 
> cheers, thanks!
> 
>> We also struggled a bit with the illustration of the processing of
>> qualified data in TUDA and based on your new I-D we can now try to
>> improve them.
>>
>> Viele Grüße,
>>
>> Henk
> 
> IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
> 


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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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> On Jul 2, 2020, at 6:31 AM, Henk Birkholz =
<henk.birkholz@sit.fraunhofer.de> wrote:
>=20
> Hi Laurence,
>=20
> while I think that I understand where you are coming from here, I have =
to say that I also think that:
>=20
> * "manufacturer(s)" is a too arbitrarily restricting term, which is =
why we agreed on endorser

The problem with Endorser is that they produce Endorsements and I think =
there are problems with Endorsements:
 - In Berlin you told me they don=E2=80=99t have keys in them. So then =
how do keys get into the Verifier?
 - Endorsements seem to be small signed documents of attributes so =
they=E2=80=99re not so good for:
     - Representing a database of millions of keys
     - Representing HTTP access to a manufacturers database of =
known-good/reference values
     - One-time physical / ceremonial transfer of a root key
- Endorsements seem like a somewhat narrowed, specific way of providing =
verifier input
- Endorsements imply signing as the security mechanism, which is too =
narrow.
    =20
Maybe we can find a term other than manufacturer?  What I want to avoid =
is the general use of the term Endorsement for the above reasons. Using =
the term Endorsement to me is like using the protocol-specific term EAT =
instead of conceptual term Attestation Evidence. Use of the term =
Endorser implies Endorsement, but maybe it is OK if we don=E2=80=99t use =
the term Endorsement.

> * every arrow is of course "input/output", but we are not calling =
evidence "Attester Output". So, Verifier Input is in contrast a too =
ambiguous category (it does not add any semantics to the arrow)

Maybe the non-specificity of =E2=80=9CVerifier Input=E2=80=9D seems =
useful? It allows the list of four (keys, ref values, static claims, =
policy) to be used and for them to be variable. It is just a grouping.

Maybe we can find a better term? Here=E2=80=99s a few:
   Verifier Criteria
   Verifier Data
   Attester Verification Criteria
   Attester Trust Materials


> * the itemized list that starts with key material provides a very =
intuitive example and maybe we could use that kind of list as a more =
prominent example in the arch I-D

I=E2=80=99d prefer the list of four to be explicit architecture, not =
just an example.

>=20
> The question, if reference values are endorsements or appraisal =
policies or a third item is... probably okay and I am interested in an =
answer - but that is a detail, I think. As long as they are also =
mentioned, I can follow all three lines of thought.

We should assume our audience knows little to nothing about TCG work =
(like me) and little about attestation, so I=E2=80=99d prefer they not =
be details, but rather up front and clear.

>=20
> Also, I am in strong doubt that the following statement is always =
correct: "The transfer of all these inputs to the Verifier does need to =
be secured.". I am confused by the exceptions that follow that statement =
which basically say, I think: in some cases they have to be secured. =
Maybe we mean different things by "secured"?

Let me try again:
- The Verifier must always establish the authenticity of the =
Manufacturer
- All input from the Manufacturer must be integrity protected
- The Verifier must always establish the authenticity of the Verifier =
Owner
- All input from the Verifier Owner must be integrity protected
- In some cases the Manufacturer may wish to establish the authenticity =
of the Verifier before giving inputs
- In some cases the Owner may wish to establish the authenticity of the =
Verifier before giving inputs
- In some cases confidentiality of the inputs is required

LL


>=20
> Viele Gr=C3=BC=C3=9Fe,
>=20
> Henk
>=20
> On 02.07.20 03:46, Laurence Lundblade wrote:
>> Here=E2=80=99s rough proposed text and diagram. Not sure where it =
would go in the doc yet.
>> LL
>>           *******************   ************     ****************
>>           * Manufacturer(s) *   * Verifier *     * Relying Party*
>>           *******************   *  Owner   *     *  Owner       *
>>                        |        ************     ****************
>>                        |              |                 |
>>           Manufacturer |              |                 |
>>               Verifier |              |Owner            |
>>                 Input  |              |Verifier         |
>>                        |              |Input            | Appraisal
>>                        |              |                 | Policy for
>>                        |              |                 | Attestation
>>                        |              |                 |  Result
>>                        v              v                 |
>>                      .-----------------.                |
>>               .----->|     Verifier    |------.         |
>>               |      '-----------------'      |         |
>>               |                               |         |
>>               |                    Attestation|         |
>>               |                    Results    |         |
>>               | Evidence                      |         |
>>               |                               |         |
>>               |                               v         v
>>         .----------.                      .-----------------.
>>         | Attester |                      | Relying Party   |
>>         '----------'                      =
'=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=
=80=98
>> Conceptually there are four main inputs to the Verifier aside from =
the Attestation Evidence. They are:
>>    - Key material for verifying trust in the Attester
>>    - Known-good/reference values for comparison with Claims in the =
Attestation Evidence
>>    - Static implicit claims for the particular Attester that are pass =
to the Relying Party in Attestation Results
>>    - Policy Configuration
>> Any of these four can come from either the Manufacturer as =
Manufacturer Verifier Input or from the Verifier Owner as Owner Verifier =
Input. They key material usually always comes from the manufacturer and =
the policy from the Verifier Owner, but there is no strict requirement =
for this. The known-good/reference values and static implicit claims =
often come from either or both.
>> There is no strict separation between Manufacturer and Verifier =
Owner. They could be the same. There could also be 3rd party =
intermediaries between the Manufacturer and the Verifier.
>> An Endorsement is one established format for some of these inputs. It =
usually comes from an Endorser that is usually the Manufacturer. It is =
usually a signed document. Alternatively, the Verifier may perform =
queries against a database, perhaps one maintained by a Manufacturer, to =
get inputs. Alternatively, the root key of a key hierarchy may be =
transferred in a one-time physical ceremony. This architecture sets no =
protocol or procedure for this input.
>> The transfer of all these inputs to the Verifier does need to be =
secured. For all cases, authenticity of the Manufacturer and Verifier =
Owner and their inputs are required. Without authentic inputs, the =
Verifier will not do its job correctly. In some cases confidentiality of =
the inputs is required. Finally, in some cases the Manufacturer and =
Verifier Owner will authenticate the Verifier.
>> This architecture sets no requirement for a particular protocol or =
security mechanism. For example, TLS could be used, but it is not the =
only protocol that could be used,
>>> On Jun 29, 2020, at 8:56 PM, Dave Thaler =
<dthaler=3D40microsoft.com@dmarc.ietf.org =
<mailto:dthaler=3D40microsoft.com@dmarc.ietf.org> =
<mailto:dthaler=3D40microsoft.com@dmarc.ietf.org =
<mailto:dthaler=3D40microsoft.com@dmarc.ietf.org>>> wrote:
>>>=20
>>> I don=E2=80=99t like the term =E2=80=9CVerifier Input=E2=80=9D since =
=E2=80=9CAppraisal Policy for Evidence=E2=80=9D is also Verifier Input, =
so I would find it confusing.
>>> I think that the rules for what to put in Attestation Results =
(bullet 3), as well as =E2=80=9Cknown-good/reference values=E2=80=9D if =
such exist
>>> (and there can be valid policies where they may not exist, or rather =
where the policies use more complex rules than
>>> a simple test for equality against a constant) are conceptually part =
of Appraisal Policy.
>>> I do agree that Appraisal Policy can be conveyed to the Verifier in =
many different ways, and may be composed
>>> of different things from different sources.
>>> Dave
>>> *From:*RATS <rats-bounces@ietf.org <mailto:rats-bounces@ietf.org> =
<mailto:rats-bounces@ietf.org <mailto:rats-bounces@ietf.org>>>*On Behalf =
Of*Laurence Lundblade
>>> *Sent:*Monday, June 29, 2020 11:34 AM
>>> *To:*rats@ietf.org <mailto:rats@ietf.org> <mailto:rats@ietf.org =
<mailto:rats@ietf.org>>
>>> *Subject:*[Rats] Verifier Input instead of Endorsement?
>>> Stepping back a bit on the definition of an Endorsement, I think the =
four inputs to a Verifier are these:
>>>   - Key material for verifying trust in the Attester
>>>   - Known-good/Reference values for comparison with claims
>>>   - Static implicit claims that are passed to RP's via Attestation =
Results
>>>   - Appraisal Policy
>>> These can and will be conveyed to the Verifier in many different =
ways:
>>>   - X.509 certs with extensions
>>>   - Signed documents
>>>   - HTTP queries against the Attester/device manufacturer
>>>   - Remote SQL or some other sort of database access to =
manufacturer(s)
>>>   - Data storage like flash drives the are hand carried into the =
Verifier's site
>>>   - One-time special file transfers
>>>   - Ceremonial procedures with M out of N people physical present =
approving transfer
>>> It seems like shoe-horning all of the above (except policy) into an =
Endorsement, like I=E2=80=99ve tried to do =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0 =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0>>  is too much. I tried this =
shoe-horning because I think the architecture document needs to cover =
all this and Endorsements was what was in it. A typical Endorsement =
seems to be just the first two mentioned, X.509 and signed documents =
expanding its definition to include database access is a stretch.
>>> Rather than defining Endorsement, I=E2=80=99d like to define =
Verifier Input:
>>>           *******************   ************     ****************
>>>           * Manufacturer(s) *   * Verifier *     * Relying Party*
>>>           *******************   *  Owner   *     *  Owner       *
>>>                        |        ************     ****************
>>>                        |              |                 |
>>>          Verifier Input|              |                 |
>>>                        |              |Appraisal        |
>>>                        |              |Policy           |
>>>                        |              |for              | Appraisal
>>>                        |              |Evidence         | Policy for
>>>                        |              |                 | =
Attestation
>>>                        |              |                 |  Result
>>>                        v              v                 |
>>>                      .-----------------.                |
>>>               .----->|     Verifier    |------.         |
>>>               |      '-----------------'      |         |
>>>               |                               |         |
>>>               |                    Attestation|         |
>>>               |                    Results    |         |
>>>               | Evidence                      |         |
>>>               |                               |         |
>>>               |                               v         v
>>>         .----------.                      .-----------------.
>>>         | Attester |                      | Relying Party   |
>>>         '----------'                      =
'=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=
=80=98
>>>=20
>>> Endorsements must still be mentioned, but as one form of Verifier =
input just like EAT is one form of Attestation Evidence.
>>> Verifier Input would be defined as:
>>>   - Key material for verifying trust in the Attester
>>>   - Known-good/Reference values for comparison with claims
>>>   - Static implicit claims that are passed to RP's via Attestation =
Results
>>> To do this, I=E2=80=99d replace the current PR =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0 =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0>> and issue =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&data=3D02%7C01%7Cdthaler=
%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab=
2d7cd011db47%7C1%7C0%7C637290524986375092&sdata=3DGfM5qElO4teNdjfABlmVayeG=
XuYHWBDqHTVtpeeew7g%3D&reserved=3D0 =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&data=3D02%7C01%7Cdthaler=
%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab=
2d7cd011db47%7C1%7C0%7C637290524986375092&sdata=3DGfM5qElO4teNdjfABlmVayeG=
XuYHWBDqHTVtpeeew7g%3D&reserved=3D0>> I have on Endorsements with a new =
PR. It will be a fair bit of work, so I want to see if there is some =
consensus first.
>>> LL
>>> _______________________________________________
>>> RATS mailing list
>>> RATS@ietf.org <mailto:RATS@ietf.org> <mailto:RATS@ietf.org =
<mailto:RATS@ietf.org>>
>>> https://www.ietf.org/mailman/listinfo/rats =
<https://www.ietf.org/mailman/listinfo/rats>
>> _______________________________________________
>> RATS mailing list
>> RATS@ietf.org <mailto:RATS@ietf.org>
>> https://www.ietf.org/mailman/listinfo/rats =
<https://www.ietf.org/mailman/listinfo/rats>
>=20
> _______________________________________________
> RATS mailing list
> RATS@ietf.org <mailto:RATS@ietf.org>
> https://www.ietf.org/mailman/listinfo/rats =
<https://www.ietf.org/mailman/listinfo/rats>

--Apple-Mail=_B35491BE-DF49-4D7C-AB0F-92DED4D23548
Content-Transfer-Encoding: quoted-printable
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	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Jul 2, 2020, at 6:31 AM, Henk Birkholz &lt;<a =
href=3D"mailto:henk.birkholz@sit.fraunhofer.de" =
class=3D"">henk.birkholz@sit.fraunhofer.de</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">Hi =
Laurence,</span></div></blockquote><blockquote type=3D"cite" =
class=3D""><div class=3D""><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">while I think that I understand where you are coming from =
here, I have to say that I also think that:</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">* "manufacturer(s)" is a too =
arbitrarily restricting term, which is why we agreed on =
endorser</span><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""></div></blockquote><div><br class=3D""></div><div>The =
problem with Endorser is that they produce Endorsements and I think =
there are problems with Endorsements:</div><div>&nbsp;- In Berlin you =
told me they don=E2=80=99t have keys in them. So then how do keys get =
into the Verifier?</div><div>&nbsp;- Endorsements seem to be small =
signed documents of attributes so they=E2=80=99re not so good =
for:</div><div>&nbsp; &nbsp; &nbsp;- Representing a database of millions =
of keys</div><div>&nbsp; &nbsp; &nbsp;- Representing HTTP access to a =
manufacturers database of known-good/reference values</div><div>&nbsp; =
&nbsp; &nbsp;- One-time physical / ceremonial transfer of a root =
key</div><div>- Endorsements seem like a somewhat narrowed, specific way =
of providing verifier input</div><div>- Endorsements imply signing as =
the security mechanism, which is too narrow.</div><div>&nbsp; &nbsp; =
&nbsp;</div><div>Maybe we can find a term other than manufacturer? =
&nbsp;What I want to avoid is the general use of the term Endorsement =
for the above reasons. Using the term Endorsement to me is like using =
the protocol-specific term EAT instead of conceptual term Attestation =
Evidence. Use of the term Endorser implies Endorsement, but maybe it is =
OK if we don=E2=80=99t use the term Endorsement.</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">* every arrow is of course =
"input/output", but we are not calling evidence "Attester Output". So, =
Verifier Input is in contrast a too ambiguous category (it does not add =
any semantics to the arrow)</span><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""></div></blockquote><div><br =
class=3D""></div><div>Maybe the non-specificity of =E2=80=9CVerifier =
Input=E2=80=9D seems useful? It allows the list of four (keys, ref =
values, static claims, policy) to be used and for them to be variable. =
It is just a grouping.</div><div><br class=3D""></div><div>Maybe we can =
find a better term? Here=E2=80=99s a few:</div><div>&nbsp; =
&nbsp;Verifier Criteria</div><div>&nbsp; &nbsp;Verifier =
Data</div><div>&nbsp; &nbsp;Attester Verification =
Criteria</div><div>&nbsp; &nbsp;Attester Trust Materials</div><div><br =
class=3D""></div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><span style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline !important;" class=3D"">* the =
itemized list that starts with key material provides a very intuitive =
example and maybe we could use that kind of list as a more prominent =
example in the arch I-D</span><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""></div></blockquote><div><br =
class=3D""></div><div>I=E2=80=99d prefer the list of four to be explicit =
architecture, not just an example.</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><br style=3D"caret-color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">The question, if reference values are endorsements or =
appraisal policies or a third item is... probably okay and I am =
interested in an answer - but that is a detail, I think. As long as they =
are also mentioned, I can follow all three lines of thought.</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" =
class=3D""></div></blockquote><div><br class=3D""></div><div>We should =
assume our audience knows little to nothing about TCG work (like me) and =
little about attestation, so I=E2=80=99d prefer they not be details, but =
rather up front and clear.</div></div><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><br style=3D"caret-color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">Also, I am in strong doubt that the following statement is =
always correct: "The transfer of all these inputs to the Verifier does =
need to be secured.". I am confused by the exceptions that follow that =
statement which basically say, I think: in some cases they have to be =
secured. Maybe we mean different things by "secured"?</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" =
class=3D""></div></blockquote><div><br class=3D""></div>Let me try =
again:</div><div>- The Verifier must always establish the authenticity =
of the Manufacturer</div><div>- All input from the Manufacturer must be =
integrity protected</div><div><div>- The Verifier must always establish =
the authenticity of the Verifier Owner</div><div>- All input from =
the&nbsp;Verifier Owner&nbsp;must be integrity protected</div><div>- In =
some cases the Manufacturer may wish to establish the authenticity of =
the Verifier before giving inputs</div><div><div>- In some cases the =
Owner may wish to establish the authenticity of the Verifier before =
giving inputs</div><div class=3D""><div>- In some cases confidentiality =
of the inputs is required</div></div><div class=3D""><br =
class=3D""></div><div class=3D"">LL</div></div><div><br =
class=3D""></div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><span style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline !important;" class=3D"">Viele =
Gr=C3=BC=C3=9Fe,</span><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">Henk</span><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">On 02.07.20 03:46, Laurence Lundblade wrote:</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" =
class=3D""><blockquote type=3D"cite" style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px; text-decoration: none;" =
class=3D"">Here=E2=80=99s rough proposed text and diagram. Not sure =
where it would go in the doc yet.<br class=3D"">LL<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>******************* &nbsp; =
************ &nbsp; &nbsp; ****************<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;<span class=3D"Apple-converted-space">&nbsp;</span>* =
Manufacturer(s) * &nbsp; * Verifier * &nbsp; &nbsp; * Relying Party*<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>******************* &nbsp; =
* &nbsp;Owner &nbsp; * &nbsp; &nbsp; * &nbsp;Owner &nbsp; &nbsp; &nbsp; =
*<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp;************ =
&nbsp; &nbsp; ****************<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;<span class=3D"Apple-converted-space">&nbsp;</span>Manufacturer | =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>Verifier | &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Owner &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;<span class=3D"Apple-converted-space">&nbsp;</span>Input =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Verifier &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;|Input &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| Appraisal<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | Policy for<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; | Attestation<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | &nbsp;Result<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;v =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;v &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;.-----------------. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;<span class=3D"Apple-converted-space">&nbsp;</span>.-----&gt;| =
&nbsp; &nbsp; Verifier &nbsp; &nbsp;|------. &nbsp; &nbsp; &nbsp; &nbsp; =
|<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>| &nbsp; &nbsp; =
&nbsp;'-----------------' &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;<span class=3D"Apple-converted-space">&nbsp;</span>| &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Attestation| &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;<span class=3D"Apple-converted-space">&nbsp;</span>| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Results =
&nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>| Evidence &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;<span class=3D"Apple-converted-space">&nbsp;</span>| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; v &nbsp; &nbsp; &nbsp; &nbsp; v<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>.----------. &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;.-----------------.<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>| Attester | &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| Relying =
Party &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>'----------' &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;'=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=98<br class=3D"">Conceptually there are four main inputs to =
the Verifier aside from the Attestation Evidence. They are:<br =
class=3D"">&nbsp; &nbsp;- Key material for verifying trust in the =
Attester<br class=3D"">&nbsp; &nbsp;- Known-good/reference values for =
comparison with Claims in the Attestation Evidence<br class=3D"">&nbsp; =
&nbsp;- Static implicit claims for the particular Attester that are pass =
to the Relying Party in Attestation Results<br class=3D"">&nbsp; &nbsp;- =
Policy Configuration<br class=3D"">Any of these four can come from =
either the Manufacturer as Manufacturer Verifier Input or from the =
Verifier Owner as Owner Verifier Input. They key material usually always =
comes from the manufacturer and the policy from the Verifier Owner, but =
there is no strict requirement for this. The known-good/reference values =
and static implicit claims often come from either or both.<br =
class=3D"">There is no strict separation between Manufacturer and =
Verifier Owner. They could be the same. There could also be 3rd party =
intermediaries between the Manufacturer and the Verifier.<br class=3D"">An=
 Endorsement is one established format for some of these inputs. It =
usually comes from an Endorser that is usually the Manufacturer. It is =
usually a signed document. Alternatively, the Verifier may perform =
queries against a database, perhaps one maintained by a Manufacturer, to =
get inputs. Alternatively, the root key of a key hierarchy may be =
transferred in a one-time physical ceremony. This architecture sets no =
protocol or procedure for this input.<br class=3D"">The transfer of all =
these inputs to the Verifier does need to be secured. For all cases, =
authenticity of the Manufacturer and Verifier Owner and their inputs are =
required. Without authentic inputs, the Verifier will not do its job =
correctly. In some cases confidentiality of the inputs is required. =
Finally, in some cases the Manufacturer and Verifier Owner will =
authenticate the Verifier.<br class=3D"">This architecture sets no =
requirement for a particular protocol or security mechanism. For =
example, TLS could be used, but it is not the only protocol that could =
be used,<br class=3D""><blockquote type=3D"cite" class=3D"">On Jun 29, =
2020, at 8:56 PM, Dave Thaler &lt;<a =
href=3D"mailto:dthaler=3D40microsoft.com@dmarc.ietf.org" =
class=3D"">dthaler=3D40microsoft.com@dmarc.ietf.org</a><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:dthaler=3D40microsoft.com@dmarc.ietf.org" =
class=3D"">mailto:dthaler=3D40microsoft.com@dmarc.ietf.org</a>&gt;&gt; =
wrote:<br class=3D""><br class=3D"">I don=E2=80=99t like the term =
=E2=80=9CVerifier Input=E2=80=9D since =E2=80=9CAppraisal Policy for =
Evidence=E2=80=9D is also Verifier Input, so I would find it =
confusing.<br class=3D"">I think that the rules for what to put in =
Attestation Results (bullet 3), as well as =E2=80=9Cknown-good/reference =
values=E2=80=9D if such exist<br class=3D"">(and there can be valid =
policies where they may not exist, or rather where the policies use more =
complex rules than<br class=3D"">a simple test for equality against a =
constant) are conceptually part of Appraisal Policy.<br class=3D"">I do =
agree that Appraisal Policy can be conveyed to the Verifier in many =
different ways, and may be composed<br class=3D"">of different things =
from different sources.<br class=3D"">Dave<br class=3D"">*From:*RATS =
&lt;<a href=3D"mailto:rats-bounces@ietf.org" =
class=3D"">rats-bounces@ietf.org</a><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:rats-bounces@ietf.org" =
class=3D"">mailto:rats-bounces@ietf.org</a>&gt;&gt;*On Behalf =
Of*Laurence Lundblade<br class=3D"">*Sent:*Monday, June 29, 2020 11:34 =
AM<br class=3D"">*To:*<a href=3D"mailto:rats@ietf.org" =
class=3D"">rats@ietf.org</a><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:rats@ietf.org" class=3D"">mailto:rats@ietf.org</a>&gt;<br =
class=3D"">*Subject:*[Rats] Verifier Input instead of Endorsement?<br =
class=3D"">Stepping back a bit on the definition of an Endorsement, I =
think the four inputs to a Verifier are these:<br class=3D"">&nbsp; - =
Key material for verifying trust in the Attester<br class=3D"">&nbsp; - =
Known-good/Reference values for comparison with claims<br =
class=3D"">&nbsp; - Static implicit claims that are passed to RP's via =
Attestation Results<br class=3D"">&nbsp; - Appraisal Policy<br =
class=3D"">These can and will be conveyed to the Verifier in many =
different ways:<br class=3D"">&nbsp; - X.509 certs with extensions<br =
class=3D"">&nbsp; - Signed documents<br class=3D"">&nbsp; - HTTP queries =
against the Attester/device manufacturer<br class=3D"">&nbsp; - Remote =
SQL or some other sort of database access to manufacturer(s)<br =
class=3D"">&nbsp; - Data storage like flash drives the are hand carried =
into the Verifier's site<br class=3D"">&nbsp; - One-time special file =
transfers<br class=3D"">&nbsp; - Ceremonial procedures with M out of N =
people physical present approving transfer<br class=3D"">It seems like =
shoe-horning all of the above (except policy) into an Endorsement, like =
I=E2=80=99ve tried to do &lt;<a =
href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C01%=
7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f=
141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2B3L=
JXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0" =
class=3D"">https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%=
2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C=
01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf=
86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2=
B3LJXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0</a>&gt; =
&nbsp;is too much. I tried this shoe-horning because I think the =
architecture document needs to cover all this and Endorsements was what =
was in it. A typical Endorsement seems to be just the first two =
mentioned, X.509 and signed documents expanding its definition to =
include database access is a stretch.<br class=3D"">Rather than defining =
Endorsement, I=E2=80=99d like to define Verifier Input:<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ******************* &nbsp; =
************ &nbsp; &nbsp; ****************<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; * Manufacturer(s) * &nbsp; * Verifier * &nbsp; =
&nbsp; * Relying Party*<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
******************* &nbsp; * &nbsp;Owner &nbsp; * &nbsp; &nbsp; * =
&nbsp;Owner &nbsp; &nbsp; &nbsp; *<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp;************ &nbsp; &nbsp; ****************<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Verifier Input| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Appraisal &nbsp; &nbsp; &nbsp; =
&nbsp;|<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|Policy &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;|for &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| =
Appraisal<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|Evidence &nbsp; &nbsp; &nbsp; &nbsp; | Policy for<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | =
Attestation<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; | &nbsp;Result<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;v &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;v &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;.-----------------. &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .-----&gt;| &nbsp; &nbsp; Verifier =
&nbsp; &nbsp;|------. &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; =
&nbsp;'-----------------' &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;Attestation| &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Results &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | Evidence &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; v &nbsp; &nbsp; &nbsp; &nbsp; v<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; .----------. &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;.-----------------.<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; | =
Attester | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;| Relying Party &nbsp; |<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span>'----------' &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;'=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=98<br class=3D""><br class=3D"">Endorsements must still be =
mentioned, but as one form of Verifier input just like EAT is one form =
of Attestation Evidence.<br class=3D"">Verifier Input would be defined =
as:<br class=3D"">&nbsp; - Key material for verifying trust in the =
Attester<br class=3D"">&nbsp; - Known-good/Reference values for =
comparison with claims<br class=3D"">&nbsp; - Static implicit claims =
that are passed to RP's via Attestation Results<br class=3D"">To do =
this, I=E2=80=99d replace the current PR &lt;<a =
href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C01%=
7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f=
141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2B3L=
JXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0" =
class=3D"">https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%=
2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C=
01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf=
86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2=
B3LJXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0</a>&gt;&nbsp;a=
nd issue &lt;<a =
href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&amp;data=3D02%7C0=
1%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf8=
6f141af91ab2d7cd011db47%7C1%7C0%7C637290524986375092&amp;sdata=3DGfM5qElO4=
teNdjfABlmVayeGXuYHWBDqHTVtpeeew7g%3D&amp;reserved=3D0" =
class=3D"">https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%=
2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&amp;data=3D02%=
7C01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988=
bf86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986375092&amp;sdata=3DGfM5qE=
lO4teNdjfABlmVayeGXuYHWBDqHTVtpeeew7g%3D&amp;reserved=3D0</a>&gt;&nbsp;I =
have on Endorsements with a new PR. It will be a fair bit of work, so I =
want to see if there is some consensus first.<br class=3D"">LL<br =
class=3D"">_______________________________________________<br =
class=3D"">RATS mailing list<br class=3D""><a =
href=3D"mailto:RATS@ietf.org" class=3D"">RATS@ietf.org</a><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:RATS@ietf.org" class=3D"">mailto:RATS@ietf.org</a>&gt;<br =
class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/rats" =
class=3D"">https://www.ietf.org/mailman/listinfo/rats</a><br =
class=3D""></blockquote>_______________________________________________<br=
 class=3D"">RATS mailing list<br class=3D""><a =
href=3D"mailto:RATS@ietf.org" class=3D"">RATS@ietf.org</a><br =
class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/rats" =
class=3D"">https://www.ietf.org/mailman/listinfo/rats</a><br =
class=3D""></blockquote><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
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Hi, thank you for the draft.
(Please expect some pendantry on how to say this is a REST based interface.
I don't think it matters what you write, someone will say you wrote it wrong)

Some things that jumped out at me:
> strong authenticity.

I don't know what this means.  I think that we went to some lengths in the
architecture to say that we were evidence of trustworthiness.
The paragraph that follows, which deals with assurance, seems much better.
Maybe just omit the first paragraph :-)

"are the three RATS actors" <- we never use "actors" in the architecture.
Some said we should, but we didn't go there.
We used "roles"... which I agree are things that actors portray.

I suggest:
   The three RATS roles of the attester (A), the relying party (RP) and the verifier (V)
   are protrayed by three principal actors.

I scanned through the rest of the document.
I didn't check your math, as I would really need to be in implementation
mindset to do that.  I feel that there is perhaps some unexplained/implicit
knowledge around the if= that I might not have understood the first time.

In this thread you offered to do a tutorial/walkthrough.
I won't say no to that, but I want to say that if the document needs a
tutorial/walkthrough to be understood, then the document needs some changes.
So, do that walkthrough, but with the idea not of explaining things, but
of getting feedback on the explanation so that you can make the document
better.

--
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 -= IPv6 IoT consulting =-

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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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Laurence Lundblade <lgl@island-resort.com> wrote:
    > The problem with Endorser is that they produce Endorsements and I thi=
nk there are problems with Endorsements:

    > - In Berlin you told me they don=E2=80=99t have keys in them. So then=
 how do
    > keys get into the Verifier?

Well, first, I thought we agreed that the arcs above Verifier were out of
scope for the architecture.  The WG might recharter to include that, but I
thought we agreed that the concerns were seperable.  HOWEVER...

So in some cases the Verifier will be configured entirely by some proprieta=
ry
mechanism.  Those mechanisms could consist of pasting a configuration file
full of keys (trust anchors probably), along with Known Good Values.
Or, they could consist of a bunch of EATs of a semi-proprietary nature.
Semi, because we haven't standardized them yet, but conceptually they are
bang-on.

Maybe you want to start a personal ID that deals with an architecture for
Endorsement?
To the extent that I think you want to use EAT for many of things, maybe it
would be a good repository of non-Evidence/non-Attestation-Result uses of
EAT.

=2D--

So, when you say "keys", I think you mostly mean Trust Anchors, right?
These would things like Manufacturer IDevID anchors.
These would allow a Verifiers to know that is dealing with authentic units
from Mfg X, and therefore the Manufacturer X-signed Endorsement that were
published somewhere can be applied.

    > - Endorsements seem to be small signed documents of attributes so the=
y=E2=80=99re not so good for:
    > - Representing a database of millions of keys
    > - Representing HTTP access to a manufacturers database of known-good/=
reference values

I don't quite understand this.
The database of keys could be a single trust anchor if the keys are all
signed in some way.  That doesn't have to be PKIX if you (like me) hate tha=
t.
EAT can be used, CoID, PGP, etc.
PGP has replicating keyserver technology that could be applied here, btw.

I don't quite understand "Representing HTTP access"... part.
I guess this is more than just having a URL.
It seems that when/if we come to standardizing the Endorsement arc, that we
might need to standardizing a way of accessing the database, even if that
is just about describing how a URL fragment can be extended with a firmware
version number.
We'd need to say how that URL fragment is communicated. I can think of a few
ways, some good, some less good.

    > - One-time physical / ceremonial transfer of a root key

Please explain how this would be used.
I'm very interested.

    > - Endorsements seem like a somewhat narrowed, specific way of providi=
ng verifier input
    > - Endorsements imply signing as the security mechanism, which is too =
narrow.

    > Maybe we can find a term other than manufacturer?  What I want to avo=
id
    > is the general use of the term Endorsement for the above reasons. Usi=
ng
    > the term Endorsement to me is like using the protocol-specific term E=
AT
    > instead of conceptual term Attestation Evidence. Use of the term
    > Endorser implies Endorsement, but maybe it is OK if we don=E2=80=99t =
use the
    > term Endorsement.

"Terms of Endorsement" <-- staring Shirley, Debra, Jack and Apple.com?

=2D-
]               Never tell me the odds!                 | ipv6 mesh network=
s [
]   Michael Richardson, Sandelman Software Works        |    IoT architect =
  [
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails  =
  [


=2D-
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -=3D IPv6 IoT consulting =3D-




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From nobody Thu Jul  2 17:22:45 2020
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Dear Nancy Cam-Winget,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    rats Session 1 (0:50 requested)
    Tuesday, 28 July 2020, Session II 1300-1350
    Room Name: Room 8 size: 8
    ---------------------------------------------
    rats Session 2 (1:40 requested)
    Wednesday, 29 July 2020, Session I 1100-1240
    Room Name: Room 6 size: 6
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/108/sessions/rats.ics

Request Information:


---------------------------------------------------------
Working Group Name: Remote ATtestation ProcedureS
Area Name: Security Area
Session Requester: Nancy Cam-Winget


Number of Sessions: 2
Length of Session(s):  100 Minutes, 50 Minutes
Number of Attendees: 60
Conflicts to Avoid: 
 Chair Conflict: secdispatch saag mile acme tls sacm teep suit netconf opsec masque

 Key Participant Conflict: anima cose dprive





People who must be present:
  Ned Smith
  Kathleen Moriarty
  Nancy Cam-Winget
  Roman Danyliw

Resources Requested:

Special Requests:
  
---------------------------------------------------------



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Subject: [Rats] Constrained Node/Network Cluster @ IETF108: FINAL AGENDA
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Here is my usual eclectic condensed agenda based on the FINAL AGENDA
for IETF108.  Remember that, occasionally, further agenda changes do
happen.

There has been no change from the DRAFT AGENDA in the Conflicts I
noted: LAKE/SUIT (!). ACE/RATS.  (I think 6LO/COSE can be ignored.)
The only significant change is that LAKE/SUIT/LOOPS has been exchanged
with CORE/TLS/TSVWG (Tuesday 1410Z vs. Friday 1100Z).  Also, the
mysterious HACKATHON has vanished.

All times appear to be in UTC, even though nothing says so in the text
agenda; https://datatracker.ietf.org/meeting/agenda-utc gives the same
times.  This time, I have focused on the events in Week 31; please see
the original agenda for Week 30 preliminaries.

Gr=C3=BC=C3=9Fe, Carsten


MONDAY, July 27, 2020

1100-1240  Session I
Rm 1    ART	dispatch	Dispatch WG - Joint with ARTAREA
Rm 2    IRTF	pearg	Privacy Enhancements and Assessments Research =
Group
Rm 5    SEC ***	teep	Trusted Execution Environment Provisioning WG

1300-1350  Session II
Rm 2    ART ***	cbor	Concise Binary Object Representation Maintenance =
and Extensions WG
Rm 3    INT	intarea	Internet Area Working Group WG
Rm 6    RTG	babel	Babel routing protocol WG
Rm 7    RTG	detnet	Deterministic Networking WG

1410-1550  Session III
Rm 1    ART	webtrans	WebTransport WG
Rm 3    IRTF	qirg	Quantum Internet Research Group
Rm 7    SEC	gnap	Grant Negotiation and Authorization Protocol WG

TUESDAY, July 28, 2020

1100-1240  Session I
Rm 1    ART ***	asdf	A Semantic Definition Format for Data and =
Interactions of Things BOF
Rm 2    INT	6man	IPv6 Maintenance WG
Rm 3    IRTF	irtfopen	IRTF Open Meeting
Rm 8    TSV	masque	Multiplexed Application Substrate over QUIC =
Encryption WG

1300-1350  Session II
Rm 7    SEC	mls	Messaging Layer Security WG
Rm 8    SEC ***	rats	Remote ATtestation ProcedureS WG

1410-1550  Session III
Rm 1    ART ***	core	Constrained RESTful Environments WG
Rm 6    SEC	tls	Transport Layer Security WG
Rm 7    TSV	tsvwg	Transport Area Working Group WG

WEDNESDAY, July 29, 2020

1100-1240  Session I
Rm 4    RTG	bier	Bit Indexed Explicit Replication WG
Rm 5    SEC ***	ace	Authentication and Authorization for Constrained =
Environments WG
Rm 6    SEC ***	rats	Remote ATtestation ProcedureS WG
Rm 7    TSV	quic	QUIC WG

1300-1350  Session II
Rm 1    INT ***	6lo	IPv6 over Networks of Resource-constrained Nodes =
WG
Rm 4    RTG	rift	Routing In Fat Trees WG
Rm 5    SEC ***	cose	CBOR Object Signing and Encryption WG
Rm 6    TSV	tsvarea	Transport Area Open Meeting

1410-1550  IETF Plenary - Plenary

THURSDAY, July 30, 2020

1100-1240  Session I
Rm 3    OPS	anima	Autonomic Networking Integrated Model and =
Approach WG
Rm 4    RTG	raw	Reliable and Available Wireless WG
Rm 5    SEC	secdispatch	Security Dispatch WG
Rm 6    TSV	tsvwg	Transport Area Working Group WG

1300-1350  Session II
Rm 4    INT ***	lpwan	IPv6 over Low Power Wide-Area Networks WG
Rm 7    SEC	saag	Security Area Open Meeting

1410-1550  Session III
Rm 2    INT	add	Adaptive DNS Discovery WG
Rm 3    INT ***	drip	Drone Remote ID Protocol WG
Rm 6    SEC	acme	Automated Certificate Management Environment WG

FRIDAY, July 31, 2020

1100-1240  Session I
Rm 5    SEC ***	lake	Lightweight Authenticated Key Exchange WG
Rm 6    SEC ***	suit	Software Updates for Internet of Things WG
Rm 7    TSV	loops	Local Optimizations on Path Segments BOF

1300-1350  Session II
Rm 3    ART	wpack	Web Packaging WG
Rm 4    INT	6man	IPv6 Maintenance WG
Rm 6    SEC	emu	EAP Method Update WG

1410-1550  Session III
Rm 1    ART ***	core	Constrained RESTful Environments WG
Rm 4    IRTF	coinrg	Computing in the Network Research Group
Rm 7    SEC	privacypass	Privacy Pass WG



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From: Thomas Fossati <Thomas.Fossati@arm.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>, "rats@ietf.org" <rats@ietf.org>
CC: Thomas Fossati <Thomas.Fossati@arm.com>
Thread-Topic: [Rats] FW: New Version Notification for draft-shaw-rats-rear-00.txt
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Subject: Re: [Rats] FW: New Version Notification for draft-shaw-rats-rear-00.txt
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From: Thomas Fossati <Thomas.Fossati@arm.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>, "rats@ietf.org" <rats@ietf.org>
CC: Thomas Fossati <Thomas.Fossati@arm.com>
Thread-Topic: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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Date: Fri, 3 Jul 2020 09:20:50 +0000
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Subject: Re: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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From: Simon Frost <Simon.Frost@arm.com>
To: Laurence Lundblade <lgl@island-resort.com>, Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
CC: Dave Thaler <dthaler=40microsoft.com@dmarc.ietf.org>, "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] Verifier Input instead of Endorsement?
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Date: Fri, 3 Jul 2020 09:28:58 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/DF-BMVXi6as-na4cyn_8xKxKk4k>
Subject: Re: [Rats] Verifier Input instead of Endorsement?
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From: Ira McDonald <blueroofmusic@gmail.com>
Date: Fri, 3 Jul 2020 14:33:39 -0400
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To: Thomas Fossati <Thomas.Fossati@arm.com>, Ira McDonald <blueroofmusic@gmail.com>
Cc: Michael Richardson <mcr+ietf@sandelman.ca>, "rats@ietf.org" <rats@ietf.org>
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Subject: Re: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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Hi Thomas,

+1

Only the Attester (with advice from the real human owner/user and/or system
administrator) can decide what is actually PII.  Various standards and
regulations
have failed miserably to crisply define what is PII.

Cheers,
- Ira


*Ira McDonald (Musician / Software Architect)Co-Chair - TCG Trusted
Mobility Solutions WG*

*Co-Chair - TCG Metadata Access Protocol SG*








*Chair - Linux Foundation Open Printing WGSecretary - IEEE-ISTO Printer
Working GroupCo-Chair - IEEE-ISTO PWG Internet Printing Protocol WGIETF
Designated Expert - IPP & Printer MIBBlue Roof Music / High North
Inchttp://sites.google.com/site/blueroofmusic
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On Fri, Jul 3, 2020 at 5:21 AM Thomas Fossati <Thomas.Fossati@arm.com>
wrote:

> Hi Michael,
>
> Thanks for raising and articulating this point.
>
> On 01/07/2020, 02:54, "Michael Richardson" <mcr+ietf@sandelman.ca> wrote:
> > I had asked in my aside, if the *ARCHITECTURE* document should create
> > a requirement on Evidence (such as EAT) that it should *explicitly*
> > flag when it contains PII.
> >
> > [...]
> >
> > So part of my question was should we debate this now, and make this an
> > architectural requirement for all containers?
>
> Personally, I am not convinced that an in-band pii flag is needed.
>
> On the Attester side, the privacy problem can be addressed by an
> attestation API that allows the caller to selectively turn off claims
> that are PII -- either with per-claim switches, or by presenting
> pre-canned PII-revealing and PII-hiding interfaces to the Evidence
> generation service. We expect the attesting endpoint to make the right
> decision about what can be hidden and what needs to be revealed
> depending on context.
>
> On the Verifier side, I'd expect that the log/audit anonymisation and
> retention policies for Evidence are an integral part of the service
> configuration.  So, no need for an in-band signal about what is to be
> considered PII since the Verifier is going to be made aware of it by
> some out-of-band means.
>
> That leaves the RP, which I'm not fully sure about.  However, my gut
> feeling is that the Attester will have to trust the RP to do the right
> thing since no in-band pii flag will ever be able to restrict what a
> malicious RP can do with the obtained PII.
>
> Am I missing anything?
>
> cheers, t
>
> PS: Maybe there is a requirement for EAT profiles to specify in their
> privacy considerations what claims are PII and what is the expected
> treatment by actors in the attestation chain.  This is EAT's job, not at
> the architecture doc level though.
>
> IMPORTANT NOTICE: The contents of this email and any attachments are
> confidential and may also be privileged. If you are not the intended
> recipient, please notify the sender immediately and do not disclose the
> contents to any other person, use it for any purpose, or store or copy the
> information in any medium. Thank you.
> _______________________________________________
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<div dir=3D"ltr"><div>Hi Thomas,</div><div><br></div><div>+1</div><div><br>=
</div><div>Only the Attester (with advice from the real human owner/user an=
d/or system</div><div>administrator) can decide what is actually PII.=C2=A0=
 Various standards and regulations</div><div>have failed miserably to crisp=
ly define what is PII.</div><div><br></div><div>Cheers,</div><div>- Ira</di=
v><div><br></div><div><div><div dir=3D"ltr" class=3D"gmail_signature" data-=
smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><=
div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=
=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr">=
<i><font size=3D"1">Ira McDonald (Musician / Software Architect)<br>Co-Chai=
r - TCG Trusted Mobility Solutions WG</font></i></div><div><i><font size=3D=
"1">Co-Chair - TCG Metadata Access Protocol SG<br></font></i></div><div dir=
=3D"ltr"><i><font size=3D"1">Chair - Linux Foundation Open Printing WG<br>S=
ecretary - IEEE-ISTO Printer Working Group<br>Co-Chair - IEEE-ISTO PWG Inte=
rnet Printing Protocol WG<br>IETF Designated Expert - IPP &amp; Printer MIB=
<br>Blue Roof Music / High North Inc<br><a style=3D"color:rgb(51,51,255)" h=
ref=3D"http://sites.google.com/site/blueroofmusic" target=3D"_blank">http:/=
/sites.google.com/site/blueroofmusic</a><br><a style=3D"color:rgb(102,0,204=
)" href=3D"http://sites.google.com/site/highnorthinc" target=3D"_blank">htt=
p://sites.google.com/site/highnorthinc</a><br>mailto: <a href=3D"mailto:blu=
eroofmusic@gmail.com" target=3D"_blank">blueroofmusic@gmail.com</a><br>(per=
manent) PO Box 221=C2=A0 Grand Marais, MI 49839=C2=A0 906-494-2434</font></=
i></div></div></div></div></div></div></div></div></div></div></div></div><=
/div></div></div></div></div></div></div><br></div></div><br><div class=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Jul 3, 2020 at 5=
:21 AM Thomas Fossati &lt;<a href=3D"mailto:Thomas.Fossati@arm.com">Thomas.=
Fossati@arm.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex">Hi Michael,<br>
<br>
Thanks for raising and articulating this point.<br>
<br>
On 01/07/2020, 02:54, &quot;Michael Richardson&quot; &lt;<a href=3D"mailto:=
mcr%2Bietf@sandelman.ca" target=3D"_blank">mcr+ietf@sandelman.ca</a>&gt; wr=
ote:<br>
&gt; I had asked in my aside, if the *ARCHITECTURE* document should create<=
br>
&gt; a requirement on Evidence (such as EAT) that it should *explicitly*<br=
>
&gt; flag when it contains PII.<br>
&gt;<br>
&gt; [...]<br>
&gt;<br>
&gt; So part of my question was should we debate this now, and make this an=
<br>
&gt; architectural requirement for all containers?<br>
<br>
Personally, I am not convinced that an in-band pii flag is needed.<br>
<br>
On the Attester side, the privacy problem can be addressed by an<br>
attestation API that allows the caller to selectively turn off claims<br>
that are PII -- either with per-claim switches, or by presenting<br>
pre-canned PII-revealing and PII-hiding interfaces to the Evidence<br>
generation service. We expect the attesting endpoint to make the right<br>
decision about what can be hidden and what needs to be revealed<br>
depending on context.<br>
<br>
On the Verifier side, I&#39;d expect that the log/audit anonymisation and<b=
r>
retention policies for Evidence are an integral part of the service<br>
configuration.=C2=A0 So, no need for an in-band signal about what is to be<=
br>
considered PII since the Verifier is going to be made aware of it by<br>
some out-of-band means.<br>
<br>
That leaves the RP, which I&#39;m not fully sure about.=C2=A0 However, my g=
ut<br>
feeling is that the Attester will have to trust the RP to do the right<br>
thing since no in-band pii flag will ever be able to restrict what a<br>
malicious RP can do with the obtained PII.<br>
<br>
Am I missing anything?<br>
<br>
cheers, t<br>
<br>
PS: Maybe there is a requirement for EAT profiles to specify in their<br>
privacy considerations what claims are PII and what is the expected<br>
treatment by actors in the attestation chain.=C2=A0 This is EAT&#39;s job, =
not at<br>
the architecture doc level though.<br>
<br>
IMPORTANT NOTICE: The contents of this email and any attachments are confid=
ential and may also be privileged. If you are not the intended recipient, p=
lease notify the sender immediately and do not disclose the contents to any=
 other person, use it for any purpose, or store or copy the information in =
any medium. Thank you.<br>
_______________________________________________<br>
RATS mailing list<br>
<a href=3D"mailto:RATS@ietf.org" target=3D"_blank">RATS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/rats" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/rats</a><br>
</blockquote></div>

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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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Hi Simon,

Appreciate you jumping in here.=20

> On Jul 3, 2020, at 2:28 AM, Simon Frost <Simon.Frost@arm.com> wrote:
>=20
> I=E2=80=99ve just tried to catch up on the thinking on this via this =
thread and github#94 and realise that the conversation has become highly =
detailed and that some very precise definitions are emerging for =
concepts that originally were quite general (e.g. endorsement). Perhaps =
there=E2=80=99s a risk that the architecture may be overly constraining =
as a result.

I am after greater generality (and clarity) than I think we have now =
with Endorsements. Endorsements are (in my understanding) a somewhat =
specific representation of data and protocol.=20

I am giving a lot of examples to try to communicate clearly, no to =
specify anything.

I would like the list-of-four in the document because I think it is =
highly informative (even Henk=E2=80=99s thinks they are so), but not as =
a prescription or requirement.=20


> =20
> Trying to avoid using any term that may now be overloaded=E2=80=A6
> It seems that the important information to capture is that the =
Verifier is a means of providing transitive trust between the relying =
party and a potentially complex Supply Chain from which the attesting =
endpoint originated. The RP to Verifier relationship must be securable =
and trustworthy in some achievable way such that an RP can trust the =
attestation results received. Similarly that creates an expectation that =
the Verifier has established securable & trustworthy relationships with =
the supply chain in order to receive appropriate proofs / testimonies of =
items that the Verifier can identify within the attestation evidence. =
The Verifier to Supply Chain relationships aren=E2=80=99t just =
technical, they require contractual relationships as well which can =
bring a strong influence into the details of how the information gets to =
the Verifier.  If we have the relationships sketched out and an =
exploration of the types of information that may be required, is it =
necessary to go into further detail?

I think this is a possible approach. To take this, I think Endorsements =
have to be either removed or redefined in some very general way to =
side-step the ideas people have about them.

LL



> =20
> Thanks
> Simon
> =20
> From: Laurence Lundblade <lgl@island-resort.com =
<mailto:lgl@island-resort.com>>=20
> Sent: 02 July 2020 18:52
> To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de =
<mailto:henk.birkholz@sit.fraunhofer.de>>
> Cc: Dave Thaler <dthaler=3D40microsoft.com@dmarc.ietf.org =
<mailto:dthaler=3D40microsoft.com@dmarc.ietf.org>>; rats@ietf.org =
<mailto:rats@ietf.org>
> Subject: Re: [Rats] Verifier Input instead of Endorsement?
> =20
> =20
> On Jul 2, 2020, at 6:31 AM, Henk Birkholz =
<henk.birkholz@sit.fraunhofer.de =
<mailto:henk.birkholz@sit.fraunhofer.de>> wrote:
> =20
> Hi Laurence,
>=20
> while I think that I understand where you are coming from here, I have =
to say that I also think that:
>=20
> * "manufacturer(s)" is a too arbitrarily restricting term, which is =
why we agreed on endorser
> =20
> The problem with Endorser is that they produce Endorsements and I =
think there are problems with Endorsements:
>  - In Berlin you told me they don=E2=80=99t have keys in them. So then =
how do keys get into the Verifier?
>  - Endorsements seem to be small signed documents of attributes so =
they=E2=80=99re not so good for:
>      - Representing a database of millions of keys
>      - Representing HTTP access to a manufacturers database of =
known-good/reference values
>      - One-time physical / ceremonial transfer of a root key
> - Endorsements seem like a somewhat narrowed, specific way of =
providing verifier input
> - Endorsements imply signing as the security mechanism, which is too =
narrow.
>     =20
> Maybe we can find a term other than manufacturer?  What I want to =
avoid is the general use of the term Endorsement for the above reasons. =
Using the term Endorsement to me is like using the protocol-specific =
term EAT instead of conceptual term Attestation Evidence. Use of the =
term Endorser implies Endorsement, but maybe it is OK if we don=E2=80=99t =
use the term Endorsement.
>=20
>=20
> * every arrow is of course "input/output", but we are not calling =
evidence "Attester Output". So, Verifier Input is in contrast a too =
ambiguous category (it does not add any semantics to the arrow)
> =20
> Maybe the non-specificity of =E2=80=9CVerifier Input=E2=80=9D seems =
useful? It allows the list of four (keys, ref values, static claims, =
policy) to be used and for them to be variable. It is just a grouping.
> =20
> Maybe we can find a better term? Here=E2=80=99s a few:
>    Verifier Criteria
>    Verifier Data
>    Attester Verification Criteria
>    Attester Trust Materials
> =20
>=20
>=20
> * the itemized list that starts with key material provides a very =
intuitive example and maybe we could use that kind of list as a more =
prominent example in the arch I-D
> =20
> I=E2=80=99d prefer the list of four to be explicit architecture, not =
just an example.
>=20
>=20
>=20
> The question, if reference values are endorsements or appraisal =
policies or a third item is... probably okay and I am interested in an =
answer - but that is a detail, I think. As long as they are also =
mentioned, I can follow all three lines of thought.
> =20
> We should assume our audience knows little to nothing about TCG work =
(like me) and little about attestation, so I=E2=80=99d prefer they not =
be details, but rather up front and clear.
>=20
>=20
>=20
> Also, I am in strong doubt that the following statement is always =
correct: "The transfer of all these inputs to the Verifier does need to =
be secured.". I am confused by the exceptions that follow that statement =
which basically say, I think: in some cases they have to be secured. =
Maybe we mean different things by "secured"?
> =20
> Let me try again:
> - The Verifier must always establish the authenticity of the =
Manufacturer
> - All input from the Manufacturer must be integrity protected
> - The Verifier must always establish the authenticity of the Verifier =
Owner
> - All input from the Verifier Owner must be integrity protected
> - In some cases the Manufacturer may wish to establish the =
authenticity of the Verifier before giving inputs
> - In some cases the Owner may wish to establish the authenticity of =
the Verifier before giving inputs
> - In some cases confidentiality of the inputs is required
> =20
> LL
> =20
>=20
>=20
>=20
> Viele Gr=C3=BC=C3=9Fe,
>=20
> Henk
>=20
> On 02.07.20 03:46, Laurence Lundblade wrote:
>=20
> Here=E2=80=99s rough proposed text and diagram. Not sure where it =
would go in the doc yet.
> LL
>           *******************   ************     ****************
>           * Manufacturer(s) *   * Verifier *     * Relying Party*
>           *******************   *  Owner   *     *  Owner       *
>                        |        ************     ****************
>                        |              |                 |
>           Manufacturer |              |                 |
>               Verifier |              |Owner            |
>                 Input  |              |Verifier         |
>                        |              |Input            | Appraisal
>                        |              |                 | Policy for
>                        |              |                 | Attestation
>                        |              |                 |  Result
>                        v              v                 |
>                      .-----------------.                |
>               .----->|     Verifier    |------.         |
>               |      '-----------------'      |         |
>               |                               |         |
>               |                    Attestation|         |
>               |                    Results    |         |
>               | Evidence                      |         |
>               |                               |         |
>               |                               v         v
>         .----------.                      .-----------------.
>         | Attester |                      | Relying Party   |
>         '----------'                      '=E2=80=94=E2=80=94=E2=80=94=E2=
=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=98
> Conceptually there are four main inputs to the Verifier aside from the =
Attestation Evidence. They are:
>    - Key material for verifying trust in the Attester
>    - Known-good/reference values for comparison with Claims in the =
Attestation Evidence
>    - Static implicit claims for the particular Attester that are pass =
to the Relying Party in Attestation Results
>    - Policy Configuration
> Any of these four can come from either the Manufacturer as =
Manufacturer Verifier Input or from the Verifier Owner as Owner Verifier =
Input. They key material usually always comes from the manufacturer and =
the policy from the Verifier Owner, but there is no strict requirement =
for this. The known-good/reference values and static implicit claims =
often come from either or both.
> There is no strict separation between Manufacturer and Verifier Owner. =
They could be the same. There could also be 3rd party intermediaries =
between the Manufacturer and the Verifier.
> An Endorsement is one established format for some of these inputs. It =
usually comes from an Endorser that is usually the Manufacturer. It is =
usually a signed document. Alternatively, the Verifier may perform =
queries against a database, perhaps one maintained by a Manufacturer, to =
get inputs. Alternatively, the root key of a key hierarchy may be =
transferred in a one-time physical ceremony. This architecture sets no =
protocol or procedure for this input.
> The transfer of all these inputs to the Verifier does need to be =
secured. For all cases, authenticity of the Manufacturer and Verifier =
Owner and their inputs are required. Without authentic inputs, the =
Verifier will not do its job correctly. In some cases confidentiality of =
the inputs is required. Finally, in some cases the Manufacturer and =
Verifier Owner will authenticate the Verifier.
> This architecture sets no requirement for a particular protocol or =
security mechanism. For example, TLS could be used, but it is not the =
only protocol that could be used,
>=20
> On Jun 29, 2020, at 8:56 PM, Dave Thaler =
<dthaler=3D40microsoft.com@dmarc.ietf.org =
<mailto:dthaler=3D40microsoft.com@dmarc.ietf.org> =
<mailto:dthaler=3D40microsoft.com@dmarc.ietf.org =
<mailto:dthaler=3D40microsoft.com@dmarc.ietf.org>>> wrote:
>=20
> I don=E2=80=99t like the term =E2=80=9CVerifier Input=E2=80=9D since =
=E2=80=9CAppraisal Policy for Evidence=E2=80=9D is also Verifier Input, =
so I would find it confusing.
> I think that the rules for what to put in Attestation Results (bullet =
3), as well as =E2=80=9Cknown-good/reference values=E2=80=9D if such =
exist
> (and there can be valid policies where they may not exist, or rather =
where the policies use more complex rules than
> a simple test for equality against a constant) are conceptually part =
of Appraisal Policy.
> I do agree that Appraisal Policy can be conveyed to the Verifier in =
many different ways, and may be composed
> of different things from different sources.
> Dave
> *From:*RATS <rats-bounces@ietf.org <mailto:rats-bounces@ietf.org> =
<mailto:rats-bounces@ietf.org <mailto:rats-bounces@ietf.org>>>*On Behalf =
Of*Laurence Lundblade
> *Sent:*Monday, June 29, 2020 11:34 AM
> *To:*rats@ietf.org <mailto:rats@ietf.org> <mailto:rats@ietf.org =
<mailto:rats@ietf.org>>
> *Subject:*[Rats] Verifier Input instead of Endorsement?
> Stepping back a bit on the definition of an Endorsement, I think the =
four inputs to a Verifier are these:
>   - Key material for verifying trust in the Attester
>   - Known-good/Reference values for comparison with claims
>   - Static implicit claims that are passed to RP's via Attestation =
Results
>   - Appraisal Policy
> These can and will be conveyed to the Verifier in many different ways:
>   - X.509 certs with extensions
>   - Signed documents
>   - HTTP queries against the Attester/device manufacturer
>   - Remote SQL or some other sort of database access to =
manufacturer(s)
>   - Data storage like flash drives the are hand carried into the =
Verifier's site
>   - One-time special file transfers
>   - Ceremonial procedures with M out of N people physical present =
approving transfer
> It seems like shoe-horning all of the above (except policy) into an =
Endorsement, like I=E2=80=99ve tried to do =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0 =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0>>  is too much. I tried this =
shoe-horning because I think the architecture document needs to cover =
all this and Endorsements was what was in it. A typical Endorsement =
seems to be just the first two mentioned, X.509 and signed documents =
expanding its definition to include database access is a stretch.
> Rather than defining Endorsement, I=E2=80=99d like to define Verifier =
Input:
>           *******************   ************     ****************
>           * Manufacturer(s) *   * Verifier *     * Relying Party*
>           *******************   *  Owner   *     *  Owner       *
>                        |        ************     ****************
>                        |              |                 |
>          Verifier Input|              |                 |
>                        |              |Appraisal        |
>                        |              |Policy           |
>                        |              |for              | Appraisal
>                        |              |Evidence         | Policy for
>                        |              |                 | Attestation
>                        |              |                 |  Result
>                        v              v                 |
>                      .-----------------.                |
>               .----->|     Verifier    |------.         |
>               |      '-----------------'      |         |
>               |                               |         |
>               |                    Attestation|         |
>               |                    Results    |         |
>               | Evidence                      |         |
>               |                               |         |
>               |                               v         v
>         .----------.                      .-----------------.
>         | Attester |                      | Relying Party   |
>         '----------'                      '=E2=80=94=E2=80=94=E2=80=94=E2=
=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=98
>=20
> Endorsements must still be mentioned, but as one form of Verifier =
input just like EAT is one form of Attestation Evidence.
> Verifier Input would be defined as:
>   - Key material for verifying trust in the Attester
>   - Known-good/Reference values for comparison with claims
>   - Static implicit claims that are passed to RP's via Attestation =
Results
> To do this, I=E2=80=99d replace the current PR =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0 =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=3D02%7C01%7Cdthaler%4=
0microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d=
7cd011db47%7C1%7C0%7C637290524986365098&sdata=3D2NktPX%2B3LJXjMEjEFoM8kpUI=
y6yOxte%2BuhFYr1ETN4g%3D&reserved=3D0>> and issue =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&data=3D02%7C01%7Cdthaler=
%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab=
2d7cd011db47%7C1%7C0%7C637290524986375092&sdata=3DGfM5qElO4teNdjfABlmVayeG=
XuYHWBDqHTVtpeeew7g%3D&reserved=3D0 =
<https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgithu=
b.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&data=3D02%7C01%7Cdthaler=
%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab=
2d7cd011db47%7C1%7C0%7C637290524986375092&sdata=3DGfM5qElO4teNdjfABlmVayeG=
XuYHWBDqHTVtpeeew7g%3D&reserved=3D0>> I have on Endorsements with a new =
PR. It will be a fair bit of work, so I want to see if there is some =
consensus first.
> LL
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> https://www.ietf.org/mailman/listinfo/rats =
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>=20
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--Apple-Mail=_0B64DFBB-931C-44EA-96A7-B693F45B915C
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	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Hi =
Simon,<div class=3D""><br class=3D""></div><div class=3D"">Appreciate =
you jumping in here.&nbsp;<br class=3D""><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Jul 3, 2020, at 2:28 AM, =
Simon Frost &lt;<a href=3D"mailto:Simon.Frost@arm.com" =
class=3D"">Simon.Frost@arm.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN-GB" class=3D"">I=E2=80=99ve just tried to catch up on the =
thinking on this via this thread and github#94 and realise that the =
conversation has become highly detailed and that some very precise =
definitions are emerging for concepts that originally were quite general =
(e.g. endorsement). Perhaps there=E2=80=99s a risk<span =
class=3D"Apple-converted-space">&nbsp;</span></span>that the =
architecture may be overly constraining as a result<span lang=3D"EN-GB" =
class=3D"">.</span></div></div></div></blockquote><div><br =
class=3D""></div><div>I am after greater generality (and clarity) than I =
think we have now with Endorsements. Endorsements are (in my =
understanding) a somewhat specific representation of data and =
protocol.&nbsp;</div><div><br class=3D""></div><div>I am giving a lot of =
examples to try to communicate clearly, no to specify =
anything.</div><div><br class=3D""></div><div>I would like the =
list-of-four in the document because I think it is highly informative =
(even Henk=E2=80=99s thinks they are so), but not as a prescription or =
requirement.&nbsp;</div><div><br class=3D""></div><div><br =
class=3D""></div><blockquote type=3D"cite" class=3D""><div class=3D""><div=
 class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN-GB" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN-GB" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span lang=3D"EN-GB" class=3D"">Trying to avoid using any =
term that may now be overloaded=E2=80=A6<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN-GB" class=3D"">It seems that the important information to =
capture is that the Verifier is a means of providing transitive trust =
between the relying party and a potentially complex Supply Chain from =
which the attesting endpoint originated. The RP to Verifier relationship =
must be securable and trustworthy in some achievable way such that an RP =
can trust the attestation results received. Similarly that creates an =
expectation that the Verifier has established securable &amp; =
trustworthy relationships with the supply chain in order to receive =
appropriate proofs / testimonies of items that the Verifier can identify =
within the attestation evidence. The Verifier to Supply Chain =
relationships aren=E2=80=99t just technical, they require contractual =
relationships as well which can bring a strong influence into the =
details of how the information gets to the Verifier. &nbsp;If we have =
the relationships sketched out and an exploration of the types of =
information that may be required, is it necessary to go into further =
detail?</span></div></div></div></blockquote><div><br =
class=3D""></div><div>I think this is a possible approach. To take this, =
I think Endorsements have to be either removed or redefined in some very =
general way to side-step the ideas people have about them.</div><div><br =
class=3D""></div><div>LL</div><div><br class=3D""></div><div><br =
class=3D""></div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div class=3D"WordSection1" style=3D"page: WordSection1; =
caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;"><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN-GB" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN-GB" class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN-GB" =
class=3D"">Thanks<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span lang=3D"EN-GB" class=3D"">Simon<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div class=3D""><div style=3D"border-style: =
solid none none; border-top-width: 1pt; border-top-color: rgb(225, 225, =
225); padding: 3pt 0cm 0cm;" class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><b class=3D""><span lang=3D"EN-US" =
class=3D"">From:</span></b><span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Laurence Lundblade &lt;<a =
href=3D"mailto:lgl@island-resort.com" style=3D"color: blue; =
text-decoration: underline;" class=3D"">lgl@island-resort.com</a>&gt;<span=
 class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span class=3D"Apple-converted-space">&nbsp;</span>02 =
July 2020 18:52<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Henk Birkholz &lt;<a =
href=3D"mailto:henk.birkholz@sit.fraunhofer.de" style=3D"color: blue; =
text-decoration: underline;" =
class=3D"">henk.birkholz@sit.fraunhofer.de</a>&gt;<br class=3D""><b =
class=3D"">Cc:</b><span class=3D"Apple-converted-space">&nbsp;</span>Dave =
Thaler &lt;<a href=3D"mailto:dthaler=3D40microsoft.com@dmarc.ietf.org" =
style=3D"color: blue; text-decoration: underline;" =
class=3D"">dthaler=3D40microsoft.com@dmarc.ietf.org</a>&gt;;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:rats@ietf.org" style=3D"color: blue; text-decoration: =
underline;" class=3D"">rats@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [Rats] Verifier Input =
instead of Endorsement?<o:p class=3D""></o:p></span></div></div></div><div=
 style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
class=3D""><blockquote style=3D"margin-top: 5pt; margin-bottom: 5pt;" =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">On Jul 2, =
2020, at 6:31 AM, Henk Birkholz &lt;<a =
href=3D"mailto:henk.birkholz@sit.fraunhofer.de" style=3D"color: blue; =
text-decoration: underline;" =
class=3D"">henk.birkholz@sit.fraunhofer.de</a>&gt; wrote:<o:p =
class=3D""></o:p></div></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 9pt; font-family: Helvetica, =
sans-serif;" class=3D"">Hi Laurence,</span><o:p =
class=3D""></o:p></div></div></blockquote><blockquote style=3D"margin-top:=
 5pt; margin-bottom: 5pt;" class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span style=3D"font-size: 9pt; =
font-family: Helvetica, sans-serif;" class=3D""><br class=3D"">while I =
think that I understand where you are coming from here, I have to say =
that I also think that:<br class=3D""><br class=3D"">* "manufacturer(s)" =
is a too arbitrarily restricting term, which is why we agreed on =
endorser</span><o:p class=3D""></o:p></div></div></blockquote><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">The problem with Endorser is that they produce Endorsements =
and I think there are problems with Endorsements:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;- In Berlin you told me they don=E2=80=99t have keys in =
them. So then how do keys get into the Verifier?<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;- Endorsements seem to be small signed documents of =
attributes so they=E2=80=99re not so good for:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp; &nbsp; &nbsp;- Representing a database of millions of =
keys<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">&nbsp; &nbsp; &nbsp;- Representing HTTP =
access to a manufacturers database of known-good/reference values<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp; &nbsp; &nbsp;- One-time physical / ceremonial transfer =
of a root key<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">- Endorsements seem like a somewhat =
narrowed, specific way of providing verifier input<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">- Endorsements imply signing as the security mechanism, which =
is too narrow.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">&nbsp; &nbsp; &nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Maybe we can find a term other than manufacturer? &nbsp;What =
I want to avoid is the general use of the term Endorsement for the above =
reasons. Using the term Endorsement to me is like using the =
protocol-specific term EAT instead of conceptual term Attestation =
Evidence. Use of the term Endorser implies Endorsement, but maybe it is =
OK if we don=E2=80=99t use the term Endorsement.<o:p =
class=3D""></o:p></div></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><br =
class=3D""><br class=3D""><o:p class=3D""></o:p></div><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
9pt; font-family: Helvetica, sans-serif;" class=3D"">* every arrow is of =
course "input/output", but we are not calling evidence "Attester =
Output". So, Verifier Input is in contrast a too ambiguous category (it =
does not add any semantics to the arrow)</span><o:p =
class=3D""></o:p></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Maybe the non-specificity of =E2=80=9CVerifier Input=E2=80=9D =
seems useful? It allows the list of four (keys, ref values, static =
claims, policy) to be used and for them to be variable. It is just a =
grouping.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Maybe we can find a better term? Here=E2=80=99s a few:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp; &nbsp;Verifier Criteria<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp; &nbsp;Verifier Data<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp; &nbsp;Attester Verification Criteria<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp; &nbsp;Attester Trust Materials<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><br class=3D""><br class=3D""><o:p =
class=3D""></o:p></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 9pt; font-family: Helvetica, =
sans-serif;" class=3D"">* the itemized list that starts with key =
material provides a very intuitive example and maybe we could use that =
kind of list as a more prominent example in the arch I-D</span><o:p =
class=3D""></o:p></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">I=E2=80=99d prefer the list of four to be explicit =
architecture, not just an example.<o:p class=3D""></o:p></div></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><br class=3D""><br class=3D""><o:p =
class=3D""></o:p></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 9pt; font-family: Helvetica, =
sans-serif;" class=3D""><br class=3D"">The question, if reference values =
are endorsements or appraisal policies or a third item is... probably =
okay and I am interested in an answer - but that is a detail, I think. =
As long as they are also mentioned, I can follow all three lines of =
thought.</span><o:p class=3D""></o:p></div></div></blockquote><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">We should assume our audience knows little to nothing about =
TCG work (like me) and little about attestation, so I=E2=80=99d prefer =
they not be details, but rather up front and clear.<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><br class=3D""><br class=3D""><o:p =
class=3D""></o:p></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 9pt; font-family: Helvetica, =
sans-serif;" class=3D""><br class=3D"">Also, I am in strong doubt that =
the following statement is always correct: "The transfer of all these =
inputs to the Verifier does need to be secured.". I am confused by the =
exceptions that follow that statement which basically say, I think: in =
some cases they have to be secured. Maybe we mean different things by =
"secured"?</span><o:p class=3D""></o:p></div></div></blockquote><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Let me try again:<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">- The Verifier must always =
establish the authenticity of the Manufacturer<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">- All input from the Manufacturer must be integrity =
protected<o:p class=3D""></o:p></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">- The Verifier must always =
establish the authenticity of the Verifier Owner<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">- All input from the&nbsp;Verifier Owner&nbsp;must be =
integrity protected<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">- In some cases the Manufacturer may =
wish to establish the authenticity of the Verifier before giving =
inputs<o:p class=3D""></o:p></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">- In some cases the Owner =
may wish to establish the authenticity of the Verifier before giving =
inputs<o:p class=3D""></o:p></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">- In some cases =
confidentiality of the inputs is required<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">LL<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><br class=3D""><br class=3D""><o:p =
class=3D""></o:p></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 9pt; font-family: Helvetica, =
sans-serif;" class=3D""><br class=3D"">Viele Gr=C3=BC=C3=9Fe,<br =
class=3D""><br class=3D"">Henk<br class=3D""><br class=3D"">On 02.07.20 =
03:46, Laurence Lundblade wrote:<br style=3D"caret-color: rgb(0, 0, 0); =
font-variant-caps: normal; text-align: start; -webkit-text-stroke-width: =
0px; word-spacing: 0px;" class=3D""><br class=3D""></span><o:p =
class=3D""></o:p></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 9pt; font-family: Helvetica, sans-serif;" =
class=3D"">Here=E2=80=99s rough proposed text and diagram. Not sure =
where it would go in the doc yet.<br class=3D"">LL<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>******************* &nbsp; =
************ &nbsp; &nbsp; ****************<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;<span class=3D"apple-converted-space">&nbsp;</span>* =
Manufacturer(s) * &nbsp; * Verifier * &nbsp; &nbsp; * Relying Party*<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>******************* &nbsp; =
* &nbsp;Owner &nbsp; * &nbsp; &nbsp; * &nbsp;Owner &nbsp; &nbsp; &nbsp; =
*<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp;************ =
&nbsp; &nbsp; ****************<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;<span class=3D"apple-converted-space">&nbsp;</span>Manufacturer | =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>Verifier | &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Owner &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;<span class=3D"apple-converted-space">&nbsp;</span>Input =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Verifier &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;|Input &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| Appraisal<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | Policy for<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; | Attestation<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | &nbsp;Result<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;v =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;v &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;.-----------------. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;<span class=3D"apple-converted-space">&nbsp;</span>.-----&gt;| =
&nbsp; &nbsp; Verifier &nbsp; &nbsp;|------. &nbsp; &nbsp; &nbsp; &nbsp; =
|<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>| &nbsp; &nbsp; =
&nbsp;'-----------------' &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;<span class=3D"apple-converted-space">&nbsp;</span>| &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Attestation| &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;<span class=3D"apple-converted-space">&nbsp;</span>| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Results =
&nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>| Evidence &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;<span class=3D"apple-converted-space">&nbsp;</span>| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>| &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; v &nbsp; &nbsp; &nbsp; &nbsp; v<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>.----------. &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;.-----------------.<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>| Attester | &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| Relying =
Party &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>'----------' &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;'=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=98<br class=3D"">Conceptually there are four main inputs to =
the Verifier aside from the Attestation Evidence. They are:<br =
class=3D"">&nbsp; &nbsp;- Key material for verifying trust in the =
Attester<br class=3D"">&nbsp; &nbsp;- Known-good/reference values for =
comparison with Claims in the Attestation Evidence<br class=3D"">&nbsp; =
&nbsp;- Static implicit claims for the particular Attester that are pass =
to the Relying Party in Attestation Results<br class=3D"">&nbsp; &nbsp;- =
Policy Configuration<br class=3D"">Any of these four can come from =
either the Manufacturer as Manufacturer Verifier Input or from the =
Verifier Owner as Owner Verifier Input. They key material usually always =
comes from the manufacturer and the policy from the Verifier Owner, but =
there is no strict requirement for this. The known-good/reference values =
and static implicit claims often come from either or both.<br =
class=3D"">There is no strict separation between Manufacturer and =
Verifier Owner. They could be the same. There could also be 3rd party =
intermediaries between the Manufacturer and the Verifier.<br class=3D"">An=
 Endorsement is one established format for some of these inputs. It =
usually comes from an Endorser that is usually the Manufacturer. It is =
usually a signed document. Alternatively, the Verifier may perform =
queries against a database, perhaps one maintained by a Manufacturer, to =
get inputs. Alternatively, the root key of a key hierarchy may be =
transferred in a one-time physical ceremony. This architecture sets no =
protocol or procedure for this input.<br class=3D"">The transfer of all =
these inputs to the Verifier does need to be secured. For all cases, =
authenticity of the Manufacturer and Verifier Owner and their inputs are =
required. Without authentic inputs, the Verifier will not do its job =
correctly. In some cases confidentiality of the inputs is required. =
Finally, in some cases the Manufacturer and Verifier Owner will =
authenticate the Verifier.<br class=3D"">This architecture sets no =
requirement for a particular protocol or security mechanism. For =
example, TLS could be used, but it is not the only protocol that could =
be used,<br class=3D""><br class=3D""><o:p =
class=3D""></o:p></span></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 9pt; font-family: Helvetica, sans-serif;" =
class=3D"">On Jun 29, 2020, at 8:56 PM, Dave Thaler &lt;<a =
href=3D"mailto:dthaler=3D40microsoft.com@dmarc.ietf.org" style=3D"color: =
blue; text-decoration: underline;" =
class=3D"">dthaler=3D40microsoft.com@dmarc.ietf.org</a><span =
class=3D"apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:dthaler=3D40microsoft.com@dmarc.ietf.org" style=3D"color: =
blue; text-decoration: underline;" =
class=3D"">mailto:dthaler=3D40microsoft.com@dmarc.ietf.org</a>&gt;&gt; =
wrote:<br class=3D""><br class=3D"">I don=E2=80=99t like the term =
=E2=80=9CVerifier Input=E2=80=9D since =E2=80=9CAppraisal Policy for =
Evidence=E2=80=9D is also Verifier Input, so I would find it =
confusing.<br class=3D"">I think that the rules for what to put in =
Attestation Results (bullet 3), as well as =E2=80=9Cknown-good/reference =
values=E2=80=9D if such exist<br class=3D"">(and there can be valid =
policies where they may not exist, or rather where the policies use more =
complex rules than<br class=3D"">a simple test for equality against a =
constant) are conceptually part of Appraisal Policy.<br class=3D"">I do =
agree that Appraisal Policy can be conveyed to the Verifier in many =
different ways, and may be composed<br class=3D"">of different things =
from different sources.<br class=3D"">Dave<br class=3D"">*From:*RATS =
&lt;<a href=3D"mailto:rats-bounces@ietf.org" style=3D"color: blue; =
text-decoration: underline;" class=3D"">rats-bounces@ietf.org</a><span =
class=3D"apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:rats-bounces@ietf.org" style=3D"color: blue; =
text-decoration: underline;" =
class=3D"">mailto:rats-bounces@ietf.org</a>&gt;&gt;*On Behalf =
Of*Laurence Lundblade<br class=3D"">*Sent:*Monday, June 29, 2020 11:34 =
AM<br class=3D"">*To:*<a href=3D"mailto:rats@ietf.org" style=3D"color: =
blue; text-decoration: underline;" class=3D"">rats@ietf.org</a><span =
class=3D"apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:rats@ietf.org" style=3D"color: blue; text-decoration: =
underline;" class=3D"">mailto:rats@ietf.org</a>&gt;<br =
class=3D"">*Subject:*[Rats] Verifier Input instead of Endorsement?<br =
class=3D"">Stepping back a bit on the definition of an Endorsement, I =
think the four inputs to a Verifier are these:<br class=3D"">&nbsp; - =
Key material for verifying trust in the Attester<br class=3D"">&nbsp; - =
Known-good/Reference values for comparison with claims<br =
class=3D"">&nbsp; - Static implicit claims that are passed to RP's via =
Attestation Results<br class=3D"">&nbsp; - Appraisal Policy<br =
class=3D"">These can and will be conveyed to the Verifier in many =
different ways:<br class=3D"">&nbsp; - X.509 certs with extensions<br =
class=3D"">&nbsp; - Signed documents<br class=3D"">&nbsp; - HTTP queries =
against the Attester/device manufacturer<br class=3D"">&nbsp; - Remote =
SQL or some other sort of database access to manufacturer(s)<br =
class=3D"">&nbsp; - Data storage like flash drives the are hand carried =
into the Verifier's site<br class=3D"">&nbsp; - One-time special file =
transfers<br class=3D"">&nbsp; - Ceremonial procedures with M out of N =
people physical present approving transfer<br class=3D"">It seems like =
shoe-horning all of the above (except policy) into an Endorsement, like =
I=E2=80=99ve tried to do &lt;<a =
href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C01%=
7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f=
141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2B3L=
JXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0" style=3D"color: =
blue; text-decoration: underline;" =
class=3D"">https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%=
2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C=
01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf=
86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2=
B3LJXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0</a>&gt; =
&nbsp;is too much. I tried this shoe-horning because I think the =
architecture document needs to cover all this and Endorsements was what =
was in it. A typical Endorsement seems to be just the first two =
mentioned, X.509 and signed documents expanding its definition to =
include database access is a stretch.<br class=3D"">Rather than defining =
Endorsement, I=E2=80=99d like to define Verifier Input:<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ******************* &nbsp; =
************ &nbsp; &nbsp; ****************<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; * Manufacturer(s) * &nbsp; * Verifier * &nbsp; =
&nbsp; * Relying Party*<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
******************* &nbsp; * &nbsp;Owner &nbsp; * &nbsp; &nbsp; * =
&nbsp;Owner &nbsp; &nbsp; &nbsp; *<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp;************ &nbsp; &nbsp; ****************<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Verifier Input| &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|Appraisal &nbsp; &nbsp; &nbsp; =
&nbsp;|<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|Policy &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;|for &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| =
Appraisal<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;|Evidence &nbsp; &nbsp; &nbsp; &nbsp; | Policy for<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | =
Attestation<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; | &nbsp;Result<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;v &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;v &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;.-----------------. &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .-----&gt;| &nbsp; &nbsp; Verifier =
&nbsp; &nbsp;|------. &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; =
&nbsp;'-----------------' &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; =
&nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;Attestation| &nbsp; &nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Results &nbsp; &nbsp;| &nbsp; =
&nbsp; &nbsp; &nbsp; |<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | Evidence &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; |<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; v &nbsp; &nbsp; &nbsp; &nbsp; v<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; .----------. &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;.-----------------.<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; | =
Attester | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;| Relying Party &nbsp; |<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span>'----------' &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;'=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=98<br class=3D""><br class=3D"">Endorsements must still be =
mentioned, but as one form of Verifier input just like EAT is one form =
of Attestation Evidence.<br class=3D"">Verifier Input would be defined =
as:<br class=3D"">&nbsp; - Key material for verifying trust in the =
Attester<br class=3D"">&nbsp; - Known-good/Reference values for =
comparison with claims<br class=3D"">&nbsp; - Static implicit claims =
that are passed to RP's via Attestation Results<br class=3D"">To do =
this, I=E2=80=99d replace the current PR &lt;<a =
href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C01%=
7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f=
141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2B3L=
JXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0" style=3D"color: =
blue; text-decoration: underline;" =
class=3D"">https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%=
2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&amp;data=3D02%7C=
01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf=
86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&amp;sdata=3D2NktPX%2=
B3LJXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&amp;reserved=3D0</a>&gt;&nbsp;a=
nd issue &lt;<a =
href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&amp;data=3D02%7C0=
1%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf8=
6f141af91ab2d7cd011db47%7C1%7C0%7C637290524986375092&amp;sdata=3DGfM5qElO4=
teNdjfABlmVayeGXuYHWBDqHTVtpeeew7g%3D&amp;reserved=3D0" style=3D"color: =
blue; text-decoration: underline;" =
class=3D"">https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%=
2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&amp;data=3D02%=
7C01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988=
bf86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986375092&amp;sdata=3DGfM5qE=
lO4teNdjfABlmVayeGXuYHWBDqHTVtpeeew7g%3D&amp;reserved=3D0</a>&gt;&nbsp;I =
have on Endorsements with a new PR. It will be a fair bit of work, so I =
want to see if there is some consensus first.<br class=3D"">LL<br =
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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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> On Jul 2, 2020, at 1:57 PM, Michael Richardson <mcr+ietf@sandelman.ca> =
wrote:
>=20
>=20
> Laurence Lundblade <lgl@island-resort.com> wrote:
>> The problem with Endorser is that they produce Endorsements and I =
think there are problems with Endorsements:
>=20
>> - In Berlin you told me they don=E2=80=99t have keys in them. So then =
how do
>> keys get into the Verifier?
>=20
> Well, first, I thought we agreed that the arcs above Verifier were out =
of
> scope for the architecture.  The WG might recharter to include that, =
but I
> thought we agreed that the concerns were seperable.  HOWEVER...

If that=E2=80=99s the approach, then Endorsements should be removed from =
the document, both in the text and diagram.


>=20
> So in some cases the Verifier will be configured entirely by some =
proprietary
> mechanism.  Those mechanisms could consist of pasting a configuration =
file
> full of keys (trust anchors probably), along with Known Good Values.
> Or, they could consist of a bunch of EATs of a semi-proprietary =
nature.
> Semi, because we haven't standardized them yet, but conceptually they =
are
> bang-on.
>=20
> Maybe you want to start a personal ID that deals with an architecture =
for
> Endorsement?
> To the extent that I think you want to use EAT for many of things, =
maybe it
> would be a good repository of non-Evidence/non-Attestation-Result uses =
of
> EAT.
>=20
> ---
>=20
> So, when you say "keys", I think you mostly mean Trust Anchors, right?

No, I don=E2=80=99t.=20

This is far past TCG, IDevID, X.509 and public key.

> These would things like Manufacturer IDevID anchors.
> These would allow a Verifiers to know that is dealing with authentic =
units
> from Mfg X, and therefore the Manufacturer X-signed Endorsement that =
were
> published somewhere can be applied.

Here=E2=80=99s an example (nothing to be standardized; just an =
illustration).

- A unique 256-bit symmetric key and key ID is put in each device by the =
Manufacturer.
- COSE_Mac0 (HMAC) is used to sign the EAT
- The EAT is conveyed to the Verifier
- The Verifier parses the EAT to get the key ID
- The Verifier makes a private HTTPS connection to the Manufacturer =
(presumably set up to be very secure)
- The Verifier sends the key ID and gets back the symmetric key
- The Verifier verifies

In another version, the Verifier sends the key ID and the to-be-signed =
bytes to the Manufacturer. The Manufacturer verifies the HMAC and sends =
back a yeah or yeah. The Verifier does the rest of the work on reference =
values and such.


>=20
>> - Endorsements seem to be small signed documents of attributes so =
they=E2=80=99re not so good for:
>> - Representing a database of millions of keys
>> - Representing HTTP access to a manufacturers database of =
known-good/reference values
>=20
> I don't quite understand this.
> The database of keys could be a single trust anchor if the keys are =
all
> signed in some way.  That doesn't have to be PKIX if you (like me) =
hate that.
> EAT can be used, CoID, PGP, etc.
> PGP has replicating keyserver technology that could be applied here, =
btw.

Yes, that=E2=80=99s all true, but still only a subset of what is =
possible. Also, I don=E2=80=99t know that this fits typical notion of an =
Endorsement.


>=20
> I don't quite understand "Representing HTTP access"... part.
> I guess this is more than just having a URL.
> It seems that when/if we come to standardizing the Endorsement arc, =
that we
> might need to standardizing a way of accessing the database, even if =
that
> is just about describing how a URL fragment can be extended with a =
firmware
> version number.
> We'd need to say how that URL fragment is communicated. I can think of =
a few
> ways, some good, some less good.

Yes. That make sense.

Just not sure that this set up fits the typical notion of an =
Endorsement.


>=20
>> - One-time physical / ceremonial transfer of a root key
>=20
> Please explain how this would be used.
> I'm very interested.

Here=E2=80=99s a symmetric key example. All the keys COSE_MAC0 keys are =
created by doing a KDF from a root symmetric key. This symmetric root is =
just 256 very important bits that need to be kept very secret. The KDF =
input is a key ID and the symmetric root.

The way the Verifier figures out the key for each device is by receiving =
the key id in the COSE_MAC0 and running the KDF on the symmetric root. =
The Verifier is probably doing this inside an HSM to keep the symmetric =
root very safe.

To get the symmetric root from the Manufacturer to the Verifier safely, =
a team of people from the Manufacturer physically travel to the location =
of the Verifier hand carrying the HSM(s) they=E2=80=99ve configured with =
the keys. It is a team so one doesn=E2=80=99t run off with it or make =
copies.

(Last century, when Qualcomm had one of the first app download systems =
ever built, Verizon=E2=80=99s Get It Now, we did physical transfers like =
this with VeriSign for the root keys for app signing (though asymmetric =
crypto was used)).



To be clear, I don=E2=80=99t want to standardize this stuff.=20

The point is that RATS architecture must allow for this and I don=E2=80=99=
t think Endorsements work this way.

LL


>=20
>> - Endorsements seem like a somewhat narrowed, specific way of =
providing verifier input
>> - Endorsements imply signing as the security mechanism, which is too =
narrow.
>=20
>> Maybe we can find a term other than manufacturer?  What I want to =
avoid
>> is the general use of the term Endorsement for the above reasons. =
Using
>> the term Endorsement to me is like using the protocol-specific term =
EAT
>> instead of conceptual term Attestation Evidence. Use of the term
>> Endorser implies Endorsement, but maybe it is OK if we don=E2=80=99t =
use the
>> term Endorsement.
>=20
> "Terms of Endorsement" <-- staring Shirley, Debra, Jack and Apple.com?
>=20
> --
> ]               Never tell me the odds!                 | ipv6 mesh =
networks [
> ]   Michael Richardson, Sandelman Software Works        |    IoT =
architect   [
> ]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on =
rails    [
>=20
>=20
> --
> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
> -=3D IPv6 IoT consulting =3D-
>=20
>=20
>=20
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats


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Subject: Re: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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Thomas Fossati <Thomas.Fossati@arm.com> wrote:
    > Personally, I am not convinced that an in-band pii flag is needed.

Just to be clear, the alternative is an out-of-band PII flag, which is to
say, a configuration on the Verifier for that claim.

This implies that the Verifier always knows all the claims that it will
receive, and that Verifiers and Attesters are never upgraded
out-of-sequence.

Remember that some of this question came up because we were discussing
whether a Verifier would have to provide Evidence as to it's trustworthiness
to the *Attester* before the Attester would trust it with PII Evidence.

Now, consider that we have some use cases for mutual Attestation (Hi Guy!)
and, and maybe we wind up with another way in which to deadlock...

    > On the Attester side, the privacy problem can be addressed by an
    > attestation API that allows the caller to selectively turn off claims
    > that are PII -- either with per-claim switches, or by presenting
    > pre-canned PII-revealing and PII-hiding interfaces to the Evidence
    > generation service. We expect the attesting endpoint to make the right
    > decision about what can be hidden and what needs to be revealed
    > depending on context.

Yes, but that's not really the point.
It's not that the Attester code base does not know which claim contains PII
or not, it's that it doesn't know if it can rely upon the Verifier to do
the right thing.

Can this even work across legal jurisdictions with different requirements and
mandates?

    > On the Verifier side, I'd expect that the log/audit anonymisation and
    > retention policies for Evidence are an integral part of the service
    > configuration.  So, no need for an in-band signal about what is to be
    > considered PII since the Verifier is going to be made aware of it by
    > some out-of-band means.

    > That leaves the RP, which I'm not fully sure about.  However, my gut
    > feeling is that the Attester will have to trust the RP to do the right
    > thing since no in-band pii flag will ever be able to restrict what a
    > malicious RP can do with the obtained PII.

    > Am I missing anything?

I think that up to know there has been a single vertical of Attester/Verifier/RP
being all built by the same vendor.  Things like changes to what is PII,
or introduction of new claims could be coordinated internally.

As we move towards a multi-vendor situation the rollout of new claims will
occur in an unpredictable way.

    > PS: Maybe there is a requirement for EAT profiles to specify in their
    > privacy considerations what claims are PII and what is the expected
    > treatment by actors in the attestation chain.  This is EAT's job, not at
    > the architecture doc level though.

I'm okay if the answer is that EAT will include some kind of flag, but
that we don't have to assume it exists at an architectural level.

--
]               Never tell me the odds!                 | ipv6 mesh networks [
]   Michael Richardson, Sandelman Software Works        |    IoT architect   [
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [


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Ira McDonald <blueroofmusic@gmail.com> wrote:
    > +1

    > Only the Attester (with advice from the real human owner/user and/or system
    > administrator) can decide what is actually PII.  Various standards and
    > regulations
    > have failed miserably to crisply define what is PII.

*WHAT* is PII is not at all relevant.
  I'm not asking for any determination of that, and if you got that impression,
  then I have failed to present the discussion well.

I am asking the question,
    [having determined that something is (or isn't) PII, ]
does the Attester need a way to signal this in-band to the Verifier?


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Laurence Lundblade <lgl@island-resort.com> wrote:
    >> Laurence Lundblade <lgl@island-resort.com> wrote:
    >>> The problem with Endorser is that they produce Endorsements and I t=
hink there are problems with Endorsements:
    >>
    >>> - In Berlin you told me they don=E2=80=99t have keys in them. So th=
en how do
    >>> keys get into the Verifier?
    >>
    >> Well, first, I thought we agreed that the arcs above Verifier were o=
ut of
    >> scope for the architecture.  The WG might recharter to include that,=
 but I
    >> thought we agreed that the concerns were seperable.  HOWEVER...

    > If that=E2=80=99s the approach, then Endorsements should be removed f=
rom the
    > document, both in the text and diagram.

That makes no sense to me.

It is perfectly reasonable to define something just well enough in order to=
 make it
clear what is out of scope for standardization.

We can come up with many different ways to standardize Endorsements (or
Verifier Inputs), and it shouldn't matter at all to the protocol between
Attester and Verifier.

That's what makes it seperable.
Do you agree?

=2D-
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -=3D IPv6 IoT consulting =3D-




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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
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Hi Thomas,

Thank you, that is my account.  I=E2=80=99ll look Monday as I grade papers o=
ver the weekend.

Best regards,
Kathleen=20

Sent from my mobile device

> On Jul 3, 2020, at 11:06 AM, Thomas Fossati <Thomas.Fossati@arm.com> wrote=
:
>=20
> =EF=BB=BFHi Kathleen,
>=20
> Today, while processing the PRs associated with part 2 of your review,
> we blocked on the proposed changes to the security considerations
> section:
>=20
>    https://github.com/ietf-rats-wg/architecture/pull/122
>=20
> as it changes the requirements on conveyance - adding confidentiality
> and availability.
>=20
> We tentatively assigned the PR to a @KME account, but we are not
> entirely sure it's yours :-)  Can you have a look please?
>=20
> cheers!
>=20
> IMPORTANT NOTICE: The contents of this email and any attachments are confi=
dential and may also be privileged. If you are not the intended recipient, p=
lease notify the sender immediately and do not disclose the contents to any o=
ther person, use it for any purpose, or store or copy the information in any=
 medium. Thank you.


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From: Thomas Fossati <Thomas.Fossati@arm.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>, "rats@ietf.org" <rats@ietf.org>
CC: Thomas Fossati <Thomas.Fossati@arm.com>
Thread-Topic: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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Subject: Re: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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From: Simon Frost <Simon.Frost@arm.com>
To: Laurence Lundblade <lgl@island-resort.com>
CC: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, Dave Thaler <dthaler=40microsoft.com@dmarc.ietf.org>, "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] Verifier Input instead of Endorsement?
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Date: Mon, 6 Jul 2020 11:55:03 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/lBTF7rcw7VRf8-3EiwXN1VKkfWw>
Subject: Re: [Rats] Verifier Input instead of Endorsement?
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To: Simon Frost <Simon.Frost@arm.com>, Laurence Lundblade <lgl@island-resort.com>
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From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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Hi all,

quick comment below

On 06.07.20 13:55, Simon Frost wrote:
> Hi Laurence,
> 
>> I am after greater generality (and clarity) than I think we have now 
> with Endorsements. Endorsements are (in my understanding) a somewhat 
> specific representation of data and protocol.
> 
> I agree with your aim. I’m suggesting that we relax that definition to 
> allow ‘Endorsements’ to cover all the categories of data originating 
> from the supply chain that the Verifier may need to consult. I’m not 
> aware that Endorsement has a specific industry definition. (I’m aware of 
> Endorsement Certificates for TPMs, but that’s a more specialised term). 
> I’m happy to have a definition pointed out or equally if Endorsement 
> just has excessive connotations for the WG then the architecture can 
> adopt another, descriptive, term. I agree that more information would 
> then be needed and your 4 categories could form the basis of a set of 
> examples for types of data in that category.
> 
> As you say on a separate reply:
> 
>> Well, first, I thought we agreed that the arcs above Verifier were out of scope for the architecture…
> 
> I remember having a discussion locally when the WG charter was defined 
> in which we agreed that keeping it out of scope was exactly the correct 
> approach, just because there were so many ways in which the 
> relationships may need to be satisfied.

In fact we agreed on "out-of-scope" for the first phase of the charter 
in order to acknowledge the fact that this is part of the "Attestation 
Provisioning Workflow" (an old term that we used to use to draw the 
demarcation line for the RATS WG phasing).

Viele Grüße,

Henk

> 
> HTH
> 
> Simon
> 
> *From:*Laurence Lundblade <lgl@island-resort.com>
> *Sent:* 04 July 2020 18:23
> *To:* Simon Frost <Simon.Frost@arm.com>
> *Cc:* Henk Birkholz <henk.birkholz@sit.fraunhofer.de>; Dave Thaler 
> <dthaler=40microsoft.com@dmarc.ietf.org>; rats@ietf.org
> *Subject:* Re: [Rats] Verifier Input instead of Endorsement?
> 
> Hi Simon,
> 
> Appreciate you jumping in here.
> 
> 
> 
>     On Jul 3, 2020, at 2:28 AM, Simon Frost <Simon.Frost@arm.com
>     <mailto:Simon.Frost@arm.com>> wrote:
> 
>     I’ve just tried to catch up on the thinking on this via this thread
>     and github#94 and realise that the conversation has become highly
>     detailed and that some very precise definitions are emerging for
>     concepts that originally were quite general (e.g. endorsement).
>     Perhaps there’s a riskthat the architecture may be overly
>     constraining as a result.
> 
> I am after greater generality (and clarity) than I think we have now 
> with Endorsements. Endorsements are (in my understanding) a somewhat 
> specific representation of data and protocol.
> 
> I am giving a lot of examples to try to communicate clearly, no to 
> specify anything.
> 
> I would like the list-of-four in the document because I think it is 
> highly informative (even Henk’s thinks they are so), but not as a 
> prescription or requirement.
> 
>     Trying to avoid using any term that may now be overloaded…
> 
>     It seems that the important information to capture is that the
>     Verifier is a means of providing transitive trust between the
>     relying party and a potentially complex Supply Chain from which the
>     attesting endpoint originated. The RP to Verifier relationship must
>     be securable and trustworthy in some achievable way such that an RP
>     can trust the attestation results received. Similarly that creates
>     an expectation that the Verifier has established securable &
>     trustworthy relationships with the supply chain in order to receive
>     appropriate proofs / testimonies of items that the Verifier can
>     identify within the attestation evidence. The Verifier to Supply
>     Chain relationships aren’t just technical, they require contractual
>     relationships as well which can bring a strong influence into the
>     details of how the information gets to the Verifier.  If we have the
>     relationships sketched out and an exploration of the types of
>     information that may be required, is it necessary to go into further
>     detail?
> 
> I think this is a possible approach. To take this, I think Endorsements 
> have to be either removed or redefined in some very general way to 
> side-step the ideas people have about them.
> 
> LL
> 
> 
> 
>     Thanks
> 
>     Simon
> 
>     *From:*Laurence Lundblade <lgl@island-resort.com
>     <mailto:lgl@island-resort.com>>
>     *Sent:*02 July 2020 18:52
>     *To:*Henk Birkholz <henk.birkholz@sit.fraunhofer.de
>     <mailto:henk.birkholz@sit.fraunhofer.de>>
>     *Cc:*Dave Thaler <dthaler=40microsoft.com@dmarc.ietf.org
>     <mailto:dthaler=40microsoft.com@dmarc.ietf.org>>;rats@ietf.org
>     <mailto:rats@ietf.org>
>     *Subject:*Re: [Rats] Verifier Input instead of Endorsement?
> 
>         On Jul 2, 2020, at 6:31 AM, Henk Birkholz
>         <henk.birkholz@sit.fraunhofer.de
>         <mailto:henk.birkholz@sit.fraunhofer.de>> wrote:
> 
>         Hi Laurence,
> 
> 
>         while I think that I understand where you are coming from here,
>         I have to say that I also think that:
> 
>         * "manufacturer(s)" is a too arbitrarily restricting term, which
>         is why we agreed on endorser
> 
>     The problem with Endorser is that they produce Endorsements and I
>     think there are problems with Endorsements:
> 
>       - In Berlin you told me they don’t have keys in them. So then how
>     do keys get into the Verifier?
> 
>       - Endorsements seem to be small signed documents of attributes so
>     they’re not so good for:
> 
>           - Representing a database of millions of keys
> 
>           - Representing HTTP access to a manufacturers database of
>     known-good/reference values
> 
>           - One-time physical / ceremonial transfer of a root key
> 
>     - Endorsements seem like a somewhat narrowed, specific way of
>     providing verifier input
> 
>     - Endorsements imply signing as the security mechanism, which is too
>     narrow.
> 
>     Maybe we can find a term other than manufacturer?  What I want to
>     avoid is the general use of the term Endorsement for the above
>     reasons. Using the term Endorsement to me is like using the
>     protocol-specific term EAT instead of conceptual term Attestation
>     Evidence. Use of the term Endorser implies Endorsement, but maybe it
>     is OK if we don’t use the term Endorsement.
> 
> 
> 
> 
>         * every arrow is of course "input/output", but we are not
>         calling evidence "Attester Output". So, Verifier Input is in
>         contrast a too ambiguous category (it does not add any semantics
>         to the arrow)
> 
>     Maybe the non-specificity of “Verifier Input” seems useful? It
>     allows the list of four (keys, ref values, static claims, policy) to
>     be used and for them to be variable. It is just a grouping.
> 
>     Maybe we can find a better term? Here’s a few:
> 
>         Verifier Criteria
> 
>         Verifier Data
> 
>         Attester Verification Criteria
> 
>         Attester Trust Materials
> 
> 
> 
> 
>         * the itemized list that starts with key material provides a
>         very intuitive example and maybe we could use that kind of list
>         as a more prominent example in the arch I-D
> 
>     I’d prefer the list of four to be explicit architecture, not just an
>     example.
> 
> 
> 
> 
> 
>         The question, if reference values are endorsements or appraisal
>         policies or a third item is... probably okay and I am interested
>         in an answer - but that is a detail, I think. As long as they
>         are also mentioned, I can follow all three lines of thought.
> 
>     We should assume our audience knows little to nothing about TCG work
>     (like me) and little about attestation, so I’d prefer they not be
>     details, but rather up front and clear.
> 
> 
> 
> 
> 
>         Also, I am in strong doubt that the following statement is
>         always correct: "The transfer of all these inputs to the
>         Verifier does need to be secured.". I am confused by the
>         exceptions that follow that statement which basically say, I
>         think: in some cases they have to be secured. Maybe we mean
>         different things by "secured"?
> 
>     Let me try again:
> 
>     - The Verifier must always establish the authenticity of the
>     Manufacturer
> 
>     - All input from the Manufacturer must be integrity protected
> 
>     - The Verifier must always establish the authenticity of the
>     Verifier Owner
> 
>     - All input from the Verifier Owner must be integrity protected
> 
>     - In some cases the Manufacturer may wish to establish the
>     authenticity of the Verifier before giving inputs
> 
>     - In some cases the Owner may wish to establish the authenticity of
>     the Verifier before giving inputs
> 
>     - In some cases confidentiality of the inputs is required
> 
>     LL
> 
> 
> 
> 
> 
>         Viele Grüße,
> 
>         Henk
> 
>         On 02.07.20 03:46, Laurence Lundblade wrote:
> 
> 
>             Here’s rough proposed text and diagram. Not sure where it
>             would go in the doc yet.
>             LL
>             *******************   ************     ****************
>             * Manufacturer(s) *   * Verifier *     * Relying Party*
>             *******************   *  Owner   *     *  Owner       *
>                                     |        ************    
>             ****************
>                                     |              |                 |
>             Manufacturer |              |                 |
>             Verifier |              |Owner            |
>             Input  |              |Verifier         |
>                                     |              |Input            |
>             Appraisal
>                                     |              |                 |
>             Policy for
>                                     |              |                 |
>             Attestation
>                                     |              |                 |
>               Result
>                                     v              v                 |
>                                   .-----------------.                |
>             .----->|     Verifier    |------.         |
>             |      '-----------------'      |         |
>             |                               |         |
>             |                    Attestation|         |
>             |                    Results    |         |
>             | Evidence                      |         |
>             |                               |         |
>             |                               v         v
>             .----------.                      .-----------------.
>             | Attester |                      | Relying Party   |
>             '----------'                      '————————‘
>             Conceptually there are four main inputs to the Verifier
>             aside from the Attestation Evidence. They are:
>                 - Key material for verifying trust in the Attester
>                 - Known-good/reference values for comparison with Claims
>             in the Attestation Evidence
>                 - Static implicit claims for the particular Attester
>             that are pass to the Relying Party in Attestation Results
>                 - Policy Configuration
>             Any of these four can come from either the Manufacturer as
>             Manufacturer Verifier Input or from the Verifier Owner as
>             Owner Verifier Input. They key material usually always comes
>             from the manufacturer and the policy from the Verifier
>             Owner, but there is no strict requirement for this. The
>             known-good/reference values and static implicit claims often
>             come from either or both.
>             There is no strict separation between Manufacturer and
>             Verifier Owner. They could be the same. There could also be
>             3rd party intermediaries between the Manufacturer and the
>             Verifier.
>             An Endorsement is one established format for some of these
>             inputs. It usually comes from an Endorser that is usually
>             the Manufacturer. It is usually a signed document.
>             Alternatively, the Verifier may perform queries against a
>             database, perhaps one maintained by a Manufacturer, to get
>             inputs. Alternatively, the root key of a key hierarchy may
>             be transferred in a one-time physical ceremony. This
>             architecture sets no protocol or procedure for this input.
>             The transfer of all these inputs to the Verifier does need
>             to be secured. For all cases, authenticity of the
>             Manufacturer and Verifier Owner and their inputs are
>             required. Without authentic inputs, the Verifier will not do
>             its job correctly. In some cases confidentiality of the
>             inputs is required. Finally, in some cases the Manufacturer
>             and Verifier Owner will authenticate the Verifier.
>             This architecture sets no requirement for a particular
>             protocol or security mechanism. For example, TLS could be
>             used, but it is not the only protocol that could be used,
> 
> 
>                 On Jun 29, 2020, at 8:56 PM, Dave Thaler
>                 <dthaler=40microsoft.com@dmarc.ietf.org
>                 <mailto:dthaler=40microsoft.com@dmarc.ietf.org><mailto:dthaler=40microsoft.com@dmarc.ietf.org>>
>                 wrote:
> 
>                 I don’t like the term “Verifier Input” since “Appraisal
>                 Policy for Evidence” is also Verifier Input, so I would
>                 find it confusing.
>                 I think that the rules for what to put in Attestation
>                 Results (bullet 3), as well as “known-good/reference
>                 values” if such exist
>                 (and there can be valid policies where they may not
>                 exist, or rather where the policies use more complex
>                 rules than
>                 a simple test for equality against a constant) are
>                 conceptually part of Appraisal Policy.
>                 I do agree that Appraisal Policy can be conveyed to the
>                 Verifier in many different ways, and may be composed
>                 of different things from different sources.
>                 Dave
>                 *From:*RATS <rats-bounces@ietf.org
>                 <mailto:rats-bounces@ietf.org><mailto:rats-bounces@ietf.org>>*On
>                 Behalf Of*Laurence Lundblade
>                 *Sent:*Monday, June 29, 2020 11:34 AM
>                 *To:*rats@ietf.org
>                 <mailto:rats@ietf.org><mailto:rats@ietf.org>
>                 *Subject:*[Rats] Verifier Input instead of Endorsement?
>                 Stepping back a bit on the definition of an Endorsement,
>                 I think the four inputs to a Verifier are these:
>                    - Key material for verifying trust in the Attester
>                    - Known-good/Reference values for comparison with claims
>                    - Static implicit claims that are passed to RP's via
>                 Attestation Results
>                    - Appraisal Policy
>                 These can and will be conveyed to the Verifier in many
>                 different ways:
>                    - X.509 certs with extensions
>                    - Signed documents
>                    - HTTP queries against the Attester/device manufacturer
>                    - Remote SQL or some other sort of database access to
>                 manufacturer(s)
>                    - Data storage like flash drives the are hand carried
>                 into the Verifier's site
>                    - One-time special file transfers
>                    - Ceremonial procedures with M out of N people
>                 physical present approving transfer
>                 It seems like shoe-horning all of the above (except
>                 policy) into an Endorsement, like I’ve tried to do
>                 <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=02%7C01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&sdata=2NktPX%2B3LJXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&reserved=0>
>                   is too much. I tried this shoe-horning because I think
>                 the architecture document needs to cover all this and
>                 Endorsements was what was in it. A typical Endorsement
>                 seems to be just the first two mentioned, X.509 and
>                 signed documents expanding its definition to include
>                 database access is a stretch.
>                 Rather than defining Endorsement, I’d like to define
>                 Verifier Input:
>                            *******************   ************    
>                 ****************
>                            * Manufacturer(s) *   * Verifier *     *
>                 Relying Party*
>                            *******************   *  Owner   *     *
>                   Owner       *
>                                         |        ************    
>                 ****************
>                                         |              |                 |
>                           Verifier Input|              |                 |
>                                         |              |Appraisal        |
>                                         |              |Policy           |
>                                         |              |for            
>                   | Appraisal
>                                         |              |Evidence        
>                 | Policy for
>                                         |              |                
>                 | Attestation
>                                         |              |                
>                 |  Result
>                                         v              v                 |
>                                       .-----------------.                |
>                                .----->|     Verifier    |------.         |
>                                |      '-----------------'      |         |
>                                |                               |         |
>                                |                    Attestation|         |
>                                |                    Results    |         |
>                                | Evidence                      |         |
>                                |                               |         |
>                                |                               v         v
>                          .----------.                    
>                   .-----------------.
>                          | Attester |                      | Relying
>                 Party   |
>                 '----------'                      '————————‘
> 
>                 Endorsements must still be mentioned, but as one form of
>                 Verifier input just like EAT is one form of Attestation
>                 Evidence.
>                 Verifier Input would be defined as:
>                    - Key material for verifying trust in the Attester
>                    - Known-good/Reference values for comparison with claims
>                    - Static implicit claims that are passed to RP's via
>                 Attestation Results
>                 To do this, I’d replace the current PR
>                 <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fpull%2F94&data=02%7C01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986365098&sdata=2NktPX%2B3LJXjMEjEFoM8kpUIy6yOxte%2BuhFYr1ETN4g%3D&reserved=0> and
>                 issue
>                 <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fietf-rats-wg%2Farchitecture%2Fissues%2F65&data=02%7C01%7Cdthaler%40microsoft.com%7Cf15ace6e8b4b447eebc008d81c5b1f33%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637290524986375092&sdata=GfM5qElO4teNdjfABlmVayeGXuYHWBDqHTVtpeeew7g%3D&reserved=0> I
>                 have on Endorsements with a new PR. It will be a fair
>                 bit of work, so I want to see if there is some consensus
>                 first.
>                 LL
>                 _______________________________________________
>                 RATS mailing list
>                 RATS@ietf.org <mailto:RATS@ietf.org><mailto:RATS@ietf.org>
>                 https://www.ietf.org/mailman/listinfo/rats
> 
>             _______________________________________________
>             RATS mailing list
>             RATS@ietf.org <mailto:RATS@ietf.org>
>             https://www.ietf.org/mailman/listinfo/rats
> 
> 
>         _______________________________________________
>         RATS mailing list
>         RATS@ietf.org <mailto:RATS@ietf.org>
>         https://www.ietf.org/mailman/listinfo/rats
> 
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Thank you for your work on this document.  I read through it on a phone, so I=
 don=E2=80=99t have detailed comments, but a few high level.

This sort of document was needed, good stuff!  Since we have a number of RES=
Tful protocols in use to exchange formatted data, it would be good to explic=
itly state support for these protocols.  SCAPv2.0 has adopted ROLIE [RFC8322=
].  Since SCAP is how posture assessment is performed, it would be good to i=
nclude this capability to enable a smooth transition to the use of remote at=
testation for simplified posture assessment as this work evolves.

Similarly, RedFish is in use for server management across several platforms.=
  I=E2=80=99ve been working with the DMTF to improve security of RedFish jus=
t in case it could be used.

There are likely other protocols that may be used, and leaving this open to a=
ccommodate various RESTful protocols may be the best approach towards enabli=
ng adoption.  This would also enable use for a shared purpose- configuration=
 management in an IT application as well as security posture assessment.

Best regards,
Kathleen=20

Sent from my mobile device

> On Jun 12, 2020, at 1:00 PM, Thomas Fossati <Thomas.Fossati@arm.com> wrote=
:
>=20
> =EF=BB=BFHi, all,
>=20
> We have just submitted a new draft "RESTful attested resources" (details
> below).
>=20
> The main goal here is creating a mechanism to expose attested system
> state as RESTful resources (i.e., "things" that can be de-referenced by
> their URIs) together with a way to securely bind said system state with
> an EAT token.
>=20
> We define two REST interfaces: one to the Attester and one to the
> Verifier, with timestamp- and nonce-based freshness.  We show how these
> can be composed into the usual "background check", "passport" and
> "time-based unidirectional" patterns.  HTTP and CoAP instantiations are
> provided, together with the associated MIME machinery.  A discovery
> method is also discussed based on the CoRE Resource Directory.
>=20
> This proposal seems in scope with the RATS charter, in particular its
> "Standardize interoperable protocols to securely convey
> assertions/claims." bit.  We hope this provides a valid contribution on
> how the RATS architecture and basic protocol elements can be used in
> high level protocol(s), and would really appreciate any feedback with
> regards to its usefulness, correctness and completeness.
>=20
> cheers, thanks!
>=20
>> On 12/06/2020, 17:48, "internet-drafts@ietf.org" <internet-drafts@ietf.or=
g> wrote:
>> A new version of I-D, draft-shaw-rats-rear-00.txt
>> has been successfully submitted by Thomas Fossati and posted to the
>> IETF repository.
>>=20
>> Name:draft-shaw-rats-rear
>> Revision:00
>> Title:Restful Attested Resources
>> Document date:2020-06-12
>> Group:Individual Submission
>> Pages:23
>> URL:            https://www.ietf.org/internet-drafts/draft-shaw-rats-rear=
-00.txt
>> Status:         https://datatracker.ietf.org/doc/draft-shaw-rats-rear/
>> Htmlized:       https://tools.ietf.org/html/draft-shaw-rats-rear-00
>> Htmlized:       https://datatracker.ietf.org/doc/html/draft-shaw-rats-rea=
r
>>=20
>>=20
>> Abstract:
>>   This memo describes a REST interface based on the RATS architecture
>>   that can be used to retrieve attested system state, for example the
>>   reading of a security critical sensor.  The objective is to present a
>>   common vocabulary of data formats and basic protocol transactions
>>   that can be pieced together into a cohesive interface that is capable
>>   of serving different attestation workflows.
>=20
>=20
>=20
>=20
> IMPORTANT NOTICE: The contents of this email and any attachments are confi=
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lease notify the sender immediately and do not disclose the contents to any o=
ther person, use it for any purpose, or store or copy the information in any=
 medium. Thank you.
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats


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Subject: Re: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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Thomas Fossati <Thomas.Fossati@arm.com> wrote:
    > On 05/07/2020, 00:11, "Michael Richardson" <mcr+ietf@sandelman.ca> wrote:
    >> As we move towards a multi-vendor situation the rollout of new claims
    >> will occur in an unpredictable way.

    > Maybe the privacy dual of EAT's "MUST ignore unknown claims" is: "apply
    > the same privacy policy you'd use for PII claims to claims that you
    > don't understand"?

Ys, that sounds like it will work in an acceptable way.

The parable of the lighthouse vs warship returns though: the lighthouse does
not in way consider it's location to be PII.
Yet the tourist's smartphone at the lighthouse does consider it PII.

    >> I'm okay if the answer is that EAT will include some kind of flag, but
    >> that we don't have to assume it exists at an architectural level.

    > What about:

    > 1. EAT requires its profiles to explicitly highlight any potential PII.
    > This will inform the privacy behaviour of the Verifiers that decide
    > to support a certain profile.

    > 2. For *unknown* claims included in Evidence that is produced according
    > to a given profile, the requirement for the Verifier is to treat
    > those unknown claims as PII.

I think that this probably errs in the correct direction.
Do you think that statement #2 is an architectural statement that must be
applied to all conveyances?

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-




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--_000_42199E8C59F646F59F100D7AD89E9121ciscocom_--


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To: "Nancy Cam-Winget (ncamwing)" <ncamwing=40cisco.com@dmarc.ietf.org>, "rats@ietf.org" <rats@ietf.org>
References: <42199E8C-59F6-46F5-9F10-0D7AD89E9121@cisco.com>
From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Date: Mon, 6 Jul 2020 23:24:45 +0200
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Subject: Re: [Rats] IETF 108 Call for agenda items
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Hi Nancy,

I'd like to request:

* Reference Interaction Models - 10 min (*)
* YANG module for CHARRA/TPM - 10 min (*)
* Attestation Event Stream Subscription - 10 min (*)
* RATS Architecture - 15 min
* "SUIT/TEEP Evidence & Attestation Result Claims" - 10 min
* Update on UCCS - 10 min

Viele Grüße,

Henk

p.s. the (*) items should be en bloc and in sequence (first session), please

On 06.07.20 23:07, Nancy Cam-Winget (ncamwing) wrote:
> Hello RATs members,
> 
> We will be meeting on Tuesday July 28 13:00-13:50UTC  and Wednesday July 
> 29 11am-12:40pm UTC.
> 
> This is a call for agenda, so if you have a topic to present please let 
> the chairs (rats-chairs@ietf.org <mailto:rats-chairs@ietf.org>) know 
> your topic and requested time.
> 
> Thanks, Nancy
> 
> 
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
> 


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From: "Nancy Cam-Winget (ncamwing)" <ncamwing@cisco.com>
To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] IETF 108 Call for agenda items
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Subject: Re: [Rats] IETF 108 Call for agenda items
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From nobody Mon Jul  6 14:52:11 2020
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To: "Nancy Cam-Winget (ncamwing)" <ncamwing@cisco.com>, "rats@ietf.org" <rats@ietf.org>
References: <42199E8C-59F6-46F5-9F10-0D7AD89E9121@cisco.com> <993a5dad-4a1f-eafe-913f-67b461039f86@sit.fraunhofer.de> <815D0226-CCEE-4581-B705-08CB744CD176@cisco.com>
From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Rats] IETF 108 Call for agenda items
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Hi Nancy,

1. yes, the first three items in the first session would be good
2. yes, that would be best, I think
3. probably not, but I am the fall-back in all cases,
    will give an update on actual presenters

Viele Grüße,

Henk

On 06.07.20 23:37, Nancy Cam-Winget (ncamwing) wrote:
> Thanks for the requests Henk!  A clarification (or three):
> 1. Are you requesting the *ed (e.g. first 3) occur in the first session?
> 2. The *ed block is in the sequence you want them to flow?
> 3. Are you the presenter for all the requested slots below?
> 
> Warm regards, Nancy
> 
> ﻿On 7/6/20, 2:25 PM, "Henk Birkholz" <henk.birkholz@sit.fraunhofer.de> wrote:
> 
>      Hi Nancy,
>      
>      I'd like to request:
>      
>      * Reference Interaction Models - 10 min (*)
>      * YANG module for CHARRA/TPM - 10 min (*)
>      * Attestation Event Stream Subscription - 10 min (*)
>      * RATS Architecture - 15 min
>      * "SUIT/TEEP Evidence & Attestation Result Claims" - 10 min
>      * Update on UCCS - 10 min
>      
>      Viele Grüße,
>      
>      Henk
>      
>      p.s. the (*) items should be en bloc and in sequence (first session), please
>      
>      On 06.07.20 23:07, Nancy Cam-Winget (ncamwing) wrote:
>      > Hello RATs members,
>      >
>      > We will be meeting on Tuesday July 28 13:00-13:50UTC  and Wednesday July
>      > 29 11am-12:40pm UTC.
>      >
>      > This is a call for agenda, so if you have a topic to present please let
>      > the chairs (rats-chairs@ietf.org <mailto:rats-chairs@ietf.org>) know
>      > your topic and requested time.
>      >
>      > Thanks, Nancy
>      >
>      >
>      > _______________________________________________
>      > RATS mailing list
>      > RATS@ietf.org
>      > https://www.ietf.org/mailman/listinfo/rats
>      >
>      
> 


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To: Michael Richardson <mcr+ietf@sandelman.ca>, "rats@ietf.org" <rats@ietf.org>
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Thread-Topic: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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From nobody Tue Jul  7 07:51:40 2020
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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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> On Jul 4, 2020, at 4:18 PM, Michael Richardson <mcr+ietf@sandelman.ca> =
wrote:
>=20
>=20
> Laurence Lundblade <lgl@island-resort.com> wrote:
>>> Laurence Lundblade <lgl@island-resort.com> wrote:
>>>> The problem with Endorser is that they produce Endorsements and I =
think there are problems with Endorsements:
>>>=20
>>>> - In Berlin you told me they don=E2=80=99t have keys in them. So =
then how do
>>>> keys get into the Verifier?
>>>=20
>>> Well, first, I thought we agreed that the arcs above Verifier were =
out of
>>> scope for the architecture.  The WG might recharter to include that, =
but I
>>> thought we agreed that the concerns were seperable.  HOWEVER...
>=20
>> If that=E2=80=99s the approach, then Endorsements should be removed =
from the
>> document, both in the text and diagram.
>=20
> That makes no sense to me.
>=20
> It is perfectly reasonable to define something just well enough in =
order to make it
> clear what is out of scope for standardization.
>=20
> We can come up with many different ways to standardize Endorsements =
(or
> Verifier Inputs), and it shouldn't matter at all to the protocol =
between
> Attester and Verifier.
>=20
> That's what makes it seperable.
> Do you agree?

Sorry, didn=E2=80=99t say that right.=20

If we=E2=80=99re going to minimize description of what is above the =
Verifier, then the term =E2=80=9CEndorsement=E2=80=9D should be replaced =
with a more general term like =E2=80=9CVerifier Input=E2=80=9D or =
=E2=80=9CAttester Trust Criteria=E2=80=9D or other.

I think there are three problems with the term =E2=80=9CEndorsement":
- It implies a specific style of input (a signed document) that is too =
narrow for a general architecture
- It is ambiguous and/or not clear it is even correct. The room in =
Berlin of experts agreed that Endorsement can=E2=80=99t have keys in =
them, but there must be a key input to the Verifier.
- It is TCG-specific. The term is not used in FIDO, Android and =
TEE-based projects that I=E2=80=99ve worked on.


Some text like this?

Verifier Input

Inputs used by the Verifier to establish trust in Attester, evaluate =
Attestation Evidence and produce Attestation results. It may include =
cryptographic keys, known-good/reference values, static implicit claims =
and policy configuration.

LL=

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jul 4, 2020, at 4:18 PM, Michael Richardson &lt;<a =
href=3D"mailto:mcr+ietf@sandelman.ca" =
class=3D"">mcr+ietf@sandelman.ca</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D""><br =
class=3D"">Laurence Lundblade &lt;<a href=3D"mailto:lgl@island-resort.com"=
 class=3D"">lgl@island-resort.com</a>&gt; wrote:<br class=3D""><blockquote=
 type=3D"cite" class=3D""><blockquote type=3D"cite" class=3D"">Laurence =
Lundblade &lt;<a href=3D"mailto:lgl@island-resort.com" =
class=3D"">lgl@island-resort.com</a>&gt; wrote:<br class=3D""><blockquote =
type=3D"cite" class=3D"">The problem with Endorser is that they produce =
Endorsements and I think there are problems with Endorsements:<br =
class=3D""></blockquote><br class=3D""><blockquote type=3D"cite" =
class=3D"">- In Berlin you told me they don=E2=80=99t have keys in them. =
So then how do<br class=3D"">keys get into the Verifier?<br =
class=3D""></blockquote><br class=3D"">Well, first, I thought we agreed =
that the arcs above Verifier were out of<br class=3D"">scope for the =
architecture. &nbsp;The WG might recharter to include that, but I<br =
class=3D"">thought we agreed that the concerns were seperable. =
&nbsp;HOWEVER...<br class=3D""></blockquote></blockquote><br =
class=3D""><blockquote type=3D"cite" class=3D"">If that=E2=80=99s the =
approach, then Endorsements should be removed from the<br =
class=3D"">document, both in the text and diagram.<br =
class=3D""></blockquote><br class=3D"">That makes no sense to me.<br =
class=3D""></div></div></blockquote><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D""><br class=3D"">It is =
perfectly reasonable to define something just well enough in order to =
make it<br class=3D"">clear what is out of scope for standardization.<br =
class=3D""><br class=3D"">We can come up with many different ways to =
standardize Endorsements (or<br class=3D"">Verifier Inputs), and it =
shouldn't matter at all to the protocol between<br class=3D"">Attester =
and Verifier.<br class=3D""><br class=3D"">That's what makes it =
seperable.<br class=3D"">Do you agree?<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>Sorry, =
didn=E2=80=99t say that right.&nbsp;</div><div><br =
class=3D""></div><div>If we=E2=80=99re going to minimize description of =
what is above the Verifier, then the term =E2=80=9CEndorsement=E2=80=9D =
should be replaced with a more general term like =E2=80=9CVerifier =
Input=E2=80=9D or =E2=80=9CAttester Trust Criteria=E2=80=9D or =
other.</div><div><br class=3D""></div><div>I think there are three =
problems with the term =E2=80=9CEndorsement":</div><div>- It implies a =
specific style of input (a signed document) that is too narrow for a =
general architecture</div><div>- It is ambiguous and/or not clear it is =
even correct. The room in Berlin of experts agreed that Endorsement =
can=E2=80=99t have keys in them, but there must be a key input to the =
Verifier.</div><div><div>- It is TCG-specific. The term is not used in =
FIDO, Android and TEE-based projects that I=E2=80=99ve worked =
on.</div><div class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div></div><div>Some text like this?</div><div><br =
class=3D""></div></div><blockquote style=3D"margin: 0 0 0 40px; border: =
none; padding: 0px;" class=3D""><div><div>Verifier =
Input</div></div><div><div><br class=3D""></div></div><div><div>Inputs =
used by the Verifier to establish trust in Attester, evaluate =
Attestation Evidence and produce Attestation results. It may include =
cryptographic keys, known-good/reference values, static implicit claims =
and policy configuration.</div></div></blockquote><div><div><br =
class=3D""></div><div>LL</div></div></body></html>=

--Apple-Mail=_72D81D32-20C3-4CF3-A4A0-36599FA26000--


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To: Laurence Lundblade <lgl@island-resort.com>, Michael Richardson <mcr+ietf@sandelman.ca>
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From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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Hi Laurence,

at first, I thought I get your line of thought, but now I am confused 
again. Sorry! Comments in-line.

On 07.07.20 16:51, Laurence Lundblade wrote:
> 
> 
>> On Jul 4, 2020, at 4:18 PM, Michael Richardson <mcr+ietf@sandelman.ca 
>> <mailto:mcr+ietf@sandelman.ca>> wrote:
>>
>>
>> Laurence Lundblade <lgl@island-resort.com 
>> <mailto:lgl@island-resort.com>> wrote:
>>>> Laurence Lundblade <lgl@island-resort.com 
>>>> <mailto:lgl@island-resort.com>> wrote:
>>>>> The problem with Endorser is that they produce Endorsements and I 
>>>>> think there are problems with Endorsements:
>>>>
>>>>> - In Berlin you told me they don’t have keys in them. So then how do
>>>>> keys get into the Verifier?
>>>>
>>>> Well, first, I thought we agreed that the arcs above Verifier were 
>>>> out of
>>>> scope for the architecture.  The WG might recharter to include that, 
>>>> but I
>>>> thought we agreed that the concerns were seperable.  HOWEVER...
>>
>>> If that’s the approach, then Endorsements should be removed from the
>>> document, both in the text and diagram.
>>
>> That makes no sense to me.
>>
>> It is perfectly reasonable to define something just well enough in 
>> order to make it
>> clear what is out of scope for standardization.
>>
>> We can come up with many different ways to standardize Endorsements (or
>> Verifier Inputs), and it shouldn't matter at all to the protocol between
>> Attester and Verifier.
>>
>> That's what makes it seperable.
>> Do you agree?
> 
> Sorry, didn’t say that right.
> 
> If we’re going to minimize description of what is above the Verifier, 
> then the term “Endorsement” should be replaced with a more general term 
> like “Verifier Input” or “Attester Trust Criteria” or other.
> 
> I think there are three problems with the term “Endorsement":
> - It implies a specific style of input (a signed document) that is too 
> narrow for a general architecture

If that is what a reader gets from the document we have to do better. An 
endorsement does not have to be signed in the way that a UCCS does not 
have to be signed. It has to be tamper-evident though, because the 
Verifier relies on its integrity. That's the point and I think that is 
not too narrow.

> - It is ambiguous and/or not clear it is even correct. The room in 
> Berlin of experts agreed that Endorsement can’t have keys in them, but 
> there must be a key input to the Verifier.

Well, my recollection of that room of experts does not include any 
opinions on key material for Endorsements as defined for IETF RATS. The 
TCG defines (I just looked that up) four specific terms around and 
"Endorsement Key", so I am relatively sure that key material is involved 
in all cases, as these are the only terms that make use of the phrase 
endorsement.

> - It is TCG-specific. The term is not used in FIDO, Android and 
> TEE-based projects that I’ve worked on.

And this confuses me. I'll do a self-quote here: "Endorsements as 
defined for IETF RATS". We are defining that term here in the RATS 
architecture. The TCG does not define it in any document that I could 
google just now. Maybe I have missed something there. But that is beside 
the point anyways. The point is that we are defining it here.


Viele Grüße,

Henk

> 
> 
> Some text like this?
> 
>     Verifier Input
> 
>     Inputs used by the Verifier to establish trust in Attester, evaluate
>     Attestation Evidence and produce Attestation results. It may include
>     cryptographic keys, known-good/reference values, static implicit
>     claims and policy configuration.
> 
> 
> LL
> 
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
> 


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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/CuHjEOrDKtMC9Kgz80YcrgFgR2w>
Subject: Re: [Rats] IETF 108 Call for agenda items
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Hi Nancy,

  Could we have 15 min on the agenda to talk about RIV changes?

  Thanks

/guy





From: RATS <rats-bounces@ietf.org> On Behalf Of Nancy Cam-Winget (ncamwing)
Sent: Monday, July 6, 2020 5:08 PM
To: rats@ietf.org
Subject: [Rats] IETF 108 Call for agenda items



[External Email. Be cautious of content]



Hello RATs members,



We will be meeting on Tuesday July 28 13:00-13:50UTC  and Wednesday July 29 
11am-12:40pm UTC.

This is a call for agenda, so if you have a topic to present please let the 
chairs (rats-chairs@ietf.org <mailto:rats-chairs@ietf.org> ) know your topic 
and requested time.



Thanks, Nancy




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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt'>Hi =
Nancy,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>=C2=A0 Could we have 15 min on the agenda to =
talk about RIV changes?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>=C2=A0 Thanks<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>/guy<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt'>From:</span></b><span =
style=3D'font-size:11.0pt'> RATS &lt;rats-bounces@ietf.org&gt; <b>On =
Behalf Of </b>Nancy Cam-Winget (ncamwing)<br><b>Sent:</b> Monday, July =
6, 2020 5:08 PM<br><b>To:</b> rats@ietf.org<br><b>Subject:</b> [Rats] =
IETF 108 Call for agenda items<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal =
style=3D'line-height:12.0pt;background:#FFEB9C'><b><span =
style=3D'font-size:10.5pt;font-family:"Lato",sans-serif;color:black'>[Ext=
ernal Email. Be cautious of content]<o:p></o:p></span></b></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt'>Hello RATs =
members,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt'>We will be meeting on =
Tuesday July 28 13:00-13:50UTC &nbsp;and Wednesday July 29 11am-12:40pm =
UTC.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>This is a call for agenda, so if you have a =
topic to present please let the chairs (<a =
href=3D"mailto:rats-chairs@ietf.org">rats-chairs@ietf.org</a>) know your =
topic and requested time.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt'>Thanks, =
Nancy<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p></div></div></body=
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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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Laurence Lundblade <lgl@island-resort.com> wrote:
    > Sorry, didn=E2=80=99t say that right.

    > If we=E2=80=99re going to minimize description of what is above the V=
erifier,
    > then the term =E2=80=9CEndorsement=E2=80=9D should be replaced with a=
 more general term
    > like =E2=80=9CVerifier Input=E2=80=9D or =E2=80=9CAttester Trust Crit=
eria=E2=80=9D or other.

I comprehend your point.

    > I think there are three problems with the term =E2=80=9CEndorsement":
    > - It implies a specific style of input (a signed document) that is too
    > narrow for a general architecture

I don't agree that it has to be a signed document.
I think it could well be configuration information.
But, it might be that, being largely TCG-ignorant, I like the term because =
I view
it without TCG-approved-eyewear.

    > - It is ambiguous and/or not clear it is even correct. The room in
    > Berlin of experts agreed that Endorsement can=E2=80=99t have keys in =
them, but
    > there must be a key input to the Verifier.

I would appreciate if Henk, or Dave could clarify this comment.
I can't see why it can't list a set of trust anchors to be used to verify
Evidence.  I assume that's the kind of keys you speak of.

    > - It is TCG-specific. The term is not used in FIDO, Android and
    > TEE-based projects that I=E2=80=99ve worked on.


    > Some text like this?

    > Verifier Input

    > Inputs used by the Verifier to establish trust in Attester, evaluate
    > Attestation Evidence and produce Attestation results. It may include
    > cryptographic keys, known-good/reference values, static implicit clai=
ms
    > and policy configuration.

I'm okay with this description, but I don't understand the dislike for
endorsement.

=2D-
]               Never tell me the odds!                 | ipv6 mesh network=
s [
]   Michael Richardson, Sandelman Software Works        |    IoT architect =
  [
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails  =
  [


=2D-
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 -=3D IPv6 IoT consulting =3D-




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To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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> On Jul 7, 2020, at 8:29 AM, Henk Birkholz =
<henk.birkholz@sit.fraunhofer.de> wrote:
>=20
> Hi Laurence,
>=20
> at first, I thought I get your line of thought, but now I am confused =
again. Sorry! Comments in-line.
>=20
> On 07.07.20 16:51, Laurence Lundblade wrote:
>>> On Jul 4, 2020, at 4:18 PM, Michael Richardson =
<mcr+ietf@sandelman.ca <mailto:mcr+ietf@sandelman.ca> =
<mailto:mcr+ietf@sandelman.ca <mailto:mcr+ietf@sandelman.ca>>> wrote:
>>>=20
>>>=20
>>> Laurence Lundblade <lgl@island-resort.com =
<mailto:lgl@island-resort.com> <mailto:lgl@island-resort.com =
<mailto:lgl@island-resort.com>>> wrote:
>>>>> Laurence Lundblade <lgl@island-resort.com =
<mailto:lgl@island-resort.com> <mailto:lgl@island-resort.com =
<mailto:lgl@island-resort.com>>> wrote:
>>>>>> The problem with Endorser is that they produce Endorsements and I =
think there are problems with Endorsements:
>>>>>=20
>>>>>> - In Berlin you told me they don=E2=80=99t have keys in them. So =
then how do
>>>>>> keys get into the Verifier?
>>>>>=20
>>>>> Well, first, I thought we agreed that the arcs above Verifier were =
out of
>>>>> scope for the architecture.  The WG might recharter to include =
that, but I
>>>>> thought we agreed that the concerns were seperable.  HOWEVER...
>>>=20
>>>> If that=E2=80=99s the approach, then Endorsements should be removed =
from the
>>>> document, both in the text and diagram.
>>>=20
>>> That makes no sense to me.
>>>=20
>>> It is perfectly reasonable to define something just well enough in =
order to make it
>>> clear what is out of scope for standardization.
>>>=20
>>> We can come up with many different ways to standardize Endorsements =
(or
>>> Verifier Inputs), and it shouldn't matter at all to the protocol =
between
>>> Attester and Verifier.
>>>=20
>>> That's what makes it seperable.
>>> Do you agree?
>> Sorry, didn=E2=80=99t say that right.
>> If we=E2=80=99re going to minimize description of what is above the =
Verifier, then the term =E2=80=9CEndorsement=E2=80=9D should be replaced =
with a more general term like =E2=80=9CVerifier Input=E2=80=9D or =
=E2=80=9CAttester Trust Criteria=E2=80=9D or other.
>> I think there are three problems with the term =E2=80=9CEndorsement":
>> - It implies a specific style of input (a signed document) that is =
too narrow for a general architecture
>=20
> If that is what a reader gets from the document we have to do better. =
An endorsement does not have to be signed in the way that a UCCS does =
not have to be signed. It has to be tamper-evident though, because the =
Verifier relies on its integrity. That's the point and I think that is =
not too narrow.

If you want to define an Endorsement as a *protocol*, not just a =
signed/unsigned document, then the term might work.

Endorsement Protocol:
 - A one-time transfer or a multiple requests/responses for each and =
every Verification or anything in between
 - Must provide integrity
 - May have to provide confidentiality, particularly for symmetric keys


>> - It is ambiguous and/or not clear it is even correct. The room in =
Berlin of experts agreed that Endorsement can=E2=80=99t have keys in =
them, but there must be a key input to the Verifier.
>=20
> Well, my recollection of that room of experts does not include any =
opinions on key material for Endorsements as defined for IETF RATS. The =
TCG defines (I just looked that up) four specific terms around and =
"Endorsement Key", so I am relatively sure that key material is involved =
in all cases, as these are the only terms that make use of the phrase =
endorsement.

My slide in Berlin said =E2=80=9CEndorsements have key material=E2=80=9D. =
You that wasn=E2=80=99t right. I said =E2=80=9Csorry for my mistake=E2=80=9D=
. The room tacitly agreed with you.

This says to me that at least one of these is true:
 - There is some pre conceived idea for what Endorsements are, seemingly =
from the the TCG world
 - There is confusion about what Endorsements are (you said no keys in =
Berlin, now you say there are keys)
 - RATS architecture is not clear about how verification key material =
gets to the Verifier.

I don=E2=80=99t mind being wrong here. My trouble is the lack of =
clarity, common understanding and gap in the RATS architecture.

>=20
>> - It is TCG-specific. The term is not used in FIDO, Android and =
TEE-based projects that I=E2=80=99ve worked on.
>=20
> And this confuses me. I'll do a self-quote here: "Endorsements as =
defined for IETF RATS". We are defining that term here in the RATS =
architecture. The TCG does not define it in any document that I could =
google just now. Maybe I have missed something there. But that is beside =
the point anyways. The point is that we are defining it here.

Seems to me there are semantics associated with the term =
=E2=80=9CEndorsement=E2=80=9D from the TCG and that seems to be of a =
relatively static document that is transferred once. It seems like =
adopting a definition in RATS that is beyond that is confusing (e.g., =
confusion between now and Berlin).  If we must use the term Endorsement, =
then I think it should Endorsement Protocol to separate from the =
previous.

I still think this is simple and could work:

Verifier Input

Inputs used by the Verifier to establish trust in Attester, evaluate =
Attestation Evidence and produce Attestation results. It may include =
cryptographic keys, known-good/reference values, static implicit claims =
and policy configuration.

LL



>=20
>=20
> Viele Gr=C3=BC=C3=9Fe,
>=20
> Henk
>=20
>> Some text like this?
>>    Verifier Input
>>    Inputs used by the Verifier to establish trust in Attester, =
evaluate
>>    Attestation Evidence and produce Attestation results. It may =
include
>>    cryptographic keys, known-good/reference values, static implicit
>>    claims and policy configuration.
>> LL
>> _______________________________________________
>> RATS mailing list
>> RATS@ietf.org <mailto:RATS@ietf.org>
>> https://www.ietf.org/mailman/listinfo/rats =
<https://www.ietf.org/mailman/listinfo/rats>
>=20
> _______________________________________________
> RATS mailing list
> RATS@ietf.org <mailto:RATS@ietf.org>
> https://www.ietf.org/mailman/listinfo/rats =
<https://www.ietf.org/mailman/listinfo/rats>

--Apple-Mail=_901EE0F4-2C75-4D51-B96F-A93283B947D4
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jul 7, 2020, at 8:29 AM, Henk Birkholz &lt;<a =
href=3D"mailto:henk.birkholz@sit.fraunhofer.de" =
class=3D"">henk.birkholz@sit.fraunhofer.de</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">Hi Laurence,</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">at first, I thought I get your =
line of thought, but now I am confused again. Sorry! Comments =
in-line.</span><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><span style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline !important;" class=3D"">On 07.07.20 =
16:51, Laurence Lundblade wrote:</span><br style=3D"caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><blockquote type=3D"cite" class=3D"">On=
 Jul 4, 2020, at 4:18 PM, Michael Richardson &lt;<a =
href=3D"mailto:mcr+ietf@sandelman.ca" =
class=3D"">mcr+ietf@sandelman.ca</a><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:mcr+ietf@sandelman.ca" =
class=3D"">mailto:mcr+ietf@sandelman.ca</a>&gt;&gt; wrote:<br =
class=3D""><br class=3D""><br class=3D"">Laurence Lundblade &lt;<a =
href=3D"mailto:lgl@island-resort.com" =
class=3D"">lgl@island-resort.com</a><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:lgl@island-resort.com" =
class=3D"">mailto:lgl@island-resort.com</a>&gt;&gt; wrote:<br =
class=3D""><blockquote type=3D"cite" class=3D""><blockquote type=3D"cite" =
class=3D"">Laurence Lundblade &lt;<a href=3D"mailto:lgl@island-resort.com"=
 class=3D"">lgl@island-resort.com</a><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:lgl@island-resort.com" =
class=3D"">mailto:lgl@island-resort.com</a>&gt;&gt; wrote:<br =
class=3D""><blockquote type=3D"cite" class=3D"">The problem with =
Endorser is that they produce Endorsements and I think there are =
problems with Endorsements:<br class=3D""></blockquote><br =
class=3D""><blockquote type=3D"cite" class=3D"">- In Berlin you told me =
they don=E2=80=99t have keys in them. So then how do<br class=3D"">keys =
get into the Verifier?<br class=3D""></blockquote><br class=3D"">Well, =
first, I thought we agreed that the arcs above Verifier were out of<br =
class=3D"">scope for the architecture. &nbsp;The WG might recharter to =
include that, but I<br class=3D"">thought we agreed that the concerns =
were seperable. &nbsp;HOWEVER...<br =
class=3D""></blockquote></blockquote><br class=3D""><blockquote =
type=3D"cite" class=3D"">If that=E2=80=99s the approach, then =
Endorsements should be removed from the<br class=3D"">document, both in =
the text and diagram.<br class=3D""></blockquote><br class=3D"">That =
makes no sense to me.<br class=3D""><br class=3D"">It is perfectly =
reasonable to define something just well enough in order to make it<br =
class=3D"">clear what is out of scope for standardization.<br =
class=3D""><br class=3D"">We can come up with many different ways to =
standardize Endorsements (or<br class=3D"">Verifier Inputs), and it =
shouldn't matter at all to the protocol between<br class=3D"">Attester =
and Verifier.<br class=3D""><br class=3D"">That's what makes it =
seperable.<br class=3D"">Do you agree?<br class=3D""></blockquote>Sorry, =
didn=E2=80=99t say that right.<br class=3D"">If we=E2=80=99re going to =
minimize description of what is above the Verifier, then the term =
=E2=80=9CEndorsement=E2=80=9D should be replaced with a more general =
term like =E2=80=9CVerifier Input=E2=80=9D or =E2=80=9CAttester Trust =
Criteria=E2=80=9D or other.<br class=3D"">I think there are three =
problems with the term =E2=80=9CEndorsement":<br class=3D"">- It implies =
a specific style of input (a signed document) that is too narrow for a =
general architecture<br class=3D""></blockquote><br style=3D"caret-color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">If that is what a reader gets from the document we have to do =
better. An endorsement does not have to be signed in the way that a UCCS =
does not have to be signed. It has to be tamper-evident though, because =
the Verifier relies on its integrity. That's the point and I think that =
is not too narrow.</span><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""></div></blockquote><div><br =
class=3D""></div><div>If you want to define an Endorsement as a =
*protocol*, not just a signed/unsigned document, then the term might =
work.</div><div><br class=3D""></div><div>Endorsement =
Protocol:</div><div>&nbsp;- A one-time transfer or a multiple =
requests/responses for each and every Verification or anything in =
between</div><div>&nbsp;- Must provide integrity</div><div>&nbsp;- May =
have to provide confidentiality, particularly for symmetric =
keys</div><div><br class=3D""></div><div><br class=3D""></div><blockquote =
type=3D"cite" class=3D""><div class=3D""><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D"">- It is ambiguous and/or not clear it =
is even correct. The room in Berlin of experts agreed that Endorsement =
can=E2=80=99t have keys in them, but there must be a key input to the =
Verifier.<br class=3D""></blockquote><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">Well, my recollection of that room of experts does not =
include any opinions on key material for Endorsements as defined for =
IETF RATS. The TCG defines (I just looked that up) four specific terms =
around and "Endorsement Key", so I am relatively sure that key material =
is involved in all cases, as these are the only terms that make use of =
the phrase endorsement.</span><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""></div></blockquote><div><br =
class=3D""></div><div>My slide in Berlin said =E2=80=9CEndorsements have =
key material=E2=80=9D. You that wasn=E2=80=99t right. I said =E2=80=9Csorr=
y for my mistake=E2=80=9D. The room tacitly agreed with =
you.</div><div><br class=3D""></div><div>This says to me that at least =
one of these is true:</div><div>&nbsp;- There is some pre conceived idea =
for what Endorsements are, seemingly from the the TCG =
world</div><div>&nbsp;- There is confusion about what Endorsements are =
(you said no keys in Berlin, now you say there are =
keys)</div><div>&nbsp;- RATS architecture is not clear about how =
verification key material gets to the Verifier.</div><div><br =
class=3D""></div><div>I don=E2=80=99t mind being wrong here. My trouble =
is the lack of clarity, common understanding and gap in the RATS =
architecture.</div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D"">- It is TCG-specific. The term is not =
used in FIDO, Android and TEE-based projects that I=E2=80=99ve worked =
on.<br class=3D""></blockquote><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">And this confuses me. I'll do a self-quote here: =
"Endorsements as defined for IETF RATS". We are defining that term here =
in the RATS architecture. The TCG does not define it in any document =
that I could google just now. Maybe I have missed something there. But =
that is beside the point anyways. The point is that we are defining it =
here.</span><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""></div></blockquote><div><br class=3D""></div><div>Seems =
to me there are semantics associated with the term =E2=80=9CEndorsement=E2=
=80=9D from the TCG and that seems to be of a relatively static document =
that is transferred once. It seems like adopting a definition in RATS =
that is beyond that is confusing (e.g., confusion between now and =
Berlin). &nbsp;If we must use the term Endorsement, then I think it =
should Endorsement Protocol to separate from the previous.</div><div><br =
class=3D""></div><div>I still think this is simple and could =
work:</div><div><br class=3D""></div><div><blockquote class=3D"" =
style=3D"margin: 0px 0px 0px 40px; border: none; padding: 0px;"><div =
class=3D"">Verifier Input</div><div class=3D""><br class=3D""></div><div =
class=3D"">Inputs used by the Verifier to establish trust in Attester, =
evaluate Attestation Evidence and produce Attestation results. It may =
include cryptographic keys, known-good/reference values, static implicit =
claims and policy configuration.</div></blockquote><div =
class=3D""></div></div><div><br class=3D""></div><div>LL</div><div><br =
class=3D""></div><div><br class=3D""></div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><br style=3D"caret-color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">Viele Gr=C3=BC=C3=9Fe,</span><br style=3D"caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">Henk</span><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D"">Some text like this?<br =
class=3D"">&nbsp;&nbsp;&nbsp;Verifier Input<br =
class=3D"">&nbsp;&nbsp;&nbsp;Inputs used by the Verifier to establish =
trust in Attester, evaluate<br class=3D"">&nbsp;&nbsp;&nbsp;Attestation =
Evidence and produce Attestation results. It may include<br =
class=3D"">&nbsp;&nbsp;&nbsp;cryptographic keys, known-good/reference =
values, static implicit<br class=3D"">&nbsp;&nbsp;&nbsp;claims and =
policy configuration.<br class=3D"">LL<br =
class=3D"">_______________________________________________<br =
class=3D"">RATS mailing list<br class=3D""><a =
href=3D"mailto:RATS@ietf.org" class=3D"">RATS@ietf.org</a><br =
class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/rats" =
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To: Laurence Lundblade <lgl@island-resort.com>
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From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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On 07.07.20 20:33, Laurence Lundblade wrote:
> 
> 
>> On Jul 7, 2020, at 8:29 AM, Henk Birkholz 
>> <henk.birkholz@sit.fraunhofer.de 
>> <mailto:henk.birkholz@sit.fraunhofer.de>> wrote:
>>
>> Hi Laurence,
>>
>> at first, I thought I get your line of thought, but now I am confused 
>> again. Sorry! Comments in-line.
>>
>> On 07.07.20 16:51, Laurence Lundblade wrote:
>>>> On Jul 4, 2020, at 4:18 PM, Michael Richardson 
>>>> <mcr+ietf@sandelman.ca 
>>>> <mailto:mcr+ietf@sandelman.ca><mailto:mcr+ietf@sandelman.ca>> wrote:
>>>>
>>>>
>>>> Laurence Lundblade <lgl@island-resort.com 
>>>> <mailto:lgl@island-resort.com><mailto:lgl@island-resort.com>> wrote:
>>>>>> Laurence Lundblade <lgl@island-resort.com 
>>>>>> <mailto:lgl@island-resort.com><mailto:lgl@island-resort.com>> wrote:
>>>>>>> The problem with Endorser is that they produce Endorsements and I 
>>>>>>> think there are problems with Endorsements:
>>>>>>
>>>>>>> - In Berlin you told me they don’t have keys in them. So then how do
>>>>>>> keys get into the Verifier?
>>>>>>
>>>>>> Well, first, I thought we agreed that the arcs above Verifier were 
>>>>>> out of
>>>>>> scope for the architecture.  The WG might recharter to include 
>>>>>> that, but I
>>>>>> thought we agreed that the concerns were seperable.  HOWEVER...
>>>>
>>>>> If that’s the approach, then Endorsements should be removed from the
>>>>> document, both in the text and diagram.
>>>>
>>>> That makes no sense to me.
>>>>
>>>> It is perfectly reasonable to define something just well enough in 
>>>> order to make it
>>>> clear what is out of scope for standardization.
>>>>
>>>> We can come up with many different ways to standardize Endorsements (or
>>>> Verifier Inputs), and it shouldn't matter at all to the protocol between
>>>> Attester and Verifier.
>>>>
>>>> That's what makes it seperable.
>>>> Do you agree?
>>> Sorry, didn’t say that right.
>>> If we’re going to minimize description of what is above the Verifier, 
>>> then the term “Endorsement” should be replaced with a more general 
>>> term like “Verifier Input” or “Attester Trust Criteria” or other.
>>> I think there are three problems with the term “Endorsement":
>>> - It implies a specific style of input (a signed document) that is 
>>> too narrow for a general architecture
>>
>> If that is what a reader gets from the document we have to do better. 
>> An endorsement does not have to be signed in the way that a UCCS does 
>> not have to be signed. It has to be tamper-evident though, because the 
>> Verifier relies on its integrity. That's the point and I think that is 
>> not too narrow.
> 
> If you want to define an Endorsement as a *protocol*, not just a 
> signed/unsigned document, then the term might work.
> 
> Endorsement Protocol:
>   - A one-time transfer or a multiple requests/responses for each and 
> every Verification or anything in between
>   - Must provide integrity
>   - May have to provide confidentiality, particularly for symmetric keys

I'd think that would be a little bit too much for an architecture, but 
to generally associate attributes, such as authentic and tamper-evident, 
with conceptual messages that are endorsements sounds fine for me at 
first glance.

Solution I-Ds can build on that as is the intent of the architecture 
document.

> 
> 
>>> - It is ambiguous and/or not clear it is even correct. The room in 
>>> Berlin of experts agreed that Endorsement can’t have keys in them, 
>>> but there must be a key input to the Verifier.
>>
>> Well, my recollection of that room of experts does not include any 
>> opinions on key material for Endorsements as defined for IETF RATS. 
>> The TCG defines (I just looked that up) four specific terms around and 
>> "Endorsement Key", so I am relatively sure that key material is 
>> involved in all cases, as these are the only terms that make use of 
>> the phrase endorsement.
> 
> My slide in Berlin said “Endorsements have key material”. You that 
> wasn’t right. I said “sorry for my mistake”. The room tacitly agreed 
> with you.

Maybe we were talking past each other? Going back to the examples I 
looked up: TCG EK-Certs, for example, can include pub-keys, of course. 
If you remember the openssl output of my screen - there were some 
pub-key structures in there. But then again, I would not focus on these 
kinds of certificates here - that seems way to niche'ish. I would rather 
like to focus on what we create here, currently (which allows for 
multiple types of Endorsements already).

> 
> This says to me that at least one of these is true:
>   - There is some pre conceived idea for what Endorsements are, 
> seemingly from the the TCG world
>   - There is confusion about what Endorsements are (you said no keys in 
> Berlin, now you say there are keys)
>   - RATS architecture is not clear about how verification key material 
> gets to the Verifier.
> 
> I don’t mind being wrong here. My trouble is the lack of clarity, common 
> understanding and gap in the RATS architecture.

I am little bit at a loss why you think that the definition here:

> https://tools.ietf.org/html/draft-ietf-rats-architecture-04#section-2

and the associated expositional text here:

> https://tools.ietf.org/html/draft-ietf-rats-architecture-04#section-8.2

is leaving any confusion to what Endorsements are?

Key Provisioning is a separate topic, I think. And I am now growing more 
certain that you are missing text about key provisioning in the RATS 
architecture document, yes?

For me that represent a tangible issue. The architecture document does 
not directly address key provisioning - that is certainly true. But I am 
not sure, if there is any intent to add text about that to a RATS 
document. Are there opinions on the list about this?

Viele Grüße,

Henk

> 
>>
>>> - It is TCG-specific. The term is not used in FIDO, Android and 
>>> TEE-based projects that I’ve worked on.
>>
>> And this confuses me. I'll do a self-quote here: "Endorsements as 
>> defined for IETF RATS". We are defining that term here in the RATS 
>> architecture. The TCG does not define it in any document that I could 
>> google just now. Maybe I have missed something there. But that is 
>> beside the point anyways. The point is that we are defining it here.
> 
> Seems to me there are semantics associated with the term “Endorsement” 
> from the TCG and that seems to be of a relatively static document that 
> is transferred once. It seems like adopting a definition in RATS that is 
> beyond that is confusing (e.g., confusion between now and Berlin).  If 
> we must use the term Endorsement, then I think it should Endorsement 
> Protocol to separate from the previous.
> 
> I still think this is simple and could work:
> 
>     Verifier Input
> 
>     Inputs used by the Verifier to establish trust in Attester, evaluate
>     Attestation Evidence and produce Attestation results. It may include
>     cryptographic keys, known-good/reference values, static implicit
>     claims and policy configuration.
> 
> 
> LL
> 
> 
> 
>>
>>
>> Viele Grüße,
>>
>> Henk
>>
>>> Some text like this?
>>>    Verifier Input
>>>    Inputs used by the Verifier to establish trust in Attester, evaluate
>>>    Attestation Evidence and produce Attestation results. It may include
>>>    cryptographic keys, known-good/reference values, static implicit
>>>    claims and policy configuration.
>>> LL
>>> _______________________________________________
>>> RATS mailing list
>>> RATS@ietf.org <mailto:RATS@ietf.org>
>>> https://www.ietf.org/mailman/listinfo/rats
>>
>> _______________________________________________
>> RATS mailing list
>> RATS@ietf.org <mailto:RATS@ietf.org>
>> https://www.ietf.org/mailman/listinfo/rats
> 


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Subject: Re: [Rats] Verifier Input instead of Endorsement?
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--=-=-=
Content-Type: text/plain


Laurence Lundblade <lgl@island-resort.com> wrote:
    > - RATS architecture is not clear about how verification key material
    > gets to the Verifier.

The RATS architecture is INTENTIONALLY unclear, as it's out of scope for this
(charter) round.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-




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From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: [Rats] Fwd: New Version Notification for draft-birkholz-rats-reference-interaction-model-03.txt
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Hi list,

this version of the reference interaction models I-D now includes the 
three main models that are used across several related documents:

* challenge/response remote attestation (charra)
* uni-directional remote attestation, and
* streaming remote attestation

New diagrams for all three interaction models can be found in section 8:

> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model#section-8

As an attester's identity is vital to all interaction models in RATS -- 
but also has severe implications -- we welcome Liqun and Chris as 
co-authors. They are experts for direct anonymous attestation (DAA) and 
remote attestation in general.

An overview about DAA can be found in section 5:

> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model#section-5


Viele Grüße,

Henk


-------- Forwarded Message --------
Subject: New Version Notification for 
draft-birkholz-rats-reference-interaction-model-03.txt
Date: Tue, 7 Jul 2020 23:41:20 -0700
From: internet-drafts@ietf.org
To: Liqun Chen <liqun.chen@surrey.ac.uk>, Michael Eckel 
<michael.eckel@sit.fraunhofer.de>, Christopher Newton 
<cn0016@surrey.ac.uk>, Henk Birkholz <henk.birkholz@sit.fraunhofer.de>


A new version of I-D, draft-birkholz-rats-reference-interaction-model-03.txt
has been successfully submitted by Henk Birkholz and posted to the
IETF repository.

Name:		draft-birkholz-rats-reference-interaction-model
Revision:	03
Title:		Reference Interaction Models for Remote Attestation Procedures
Document date:	2020-07-08
Group:		Individual Submission
Pages:		22
URL: 
https://www.ietf.org/internet-drafts/draft-birkholz-rats-reference-interaction-model-03.txt
Status: 
https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interaction-model/
Htmlized: 
https://tools.ietf.org/html/draft-birkholz-rats-reference-interaction-model-03
Htmlized: 
https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model
Diff: 
https://www.ietf.org/rfcdiff?url2=draft-birkholz-rats-reference-interaction-model-03

Abstract:
    This document describes interaction models for remote attestation
    procedures (RATS).  Three conveying mechanisms - Challenge/Response,
    Uni-Directional, and Streaming Remote Attestation - are illustrated
    and defined.  Analogously, a general overview about the information
    elements typically used by corresponding conveyance protocols are
    highlighted.  Privacy preserving conveyance of Evidence via Direct
    Anonymous Attestation is elaborated on for each interaction model,
    individually.

 


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat



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From: Anders Rundgren <anders.rundgren.net@gmail.com>
To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, "rats@ietf.org" <rats@ietf.org>
Cc: Guy Fedorkow <gfedorkow@juniper.net>, Thomas Fossati <Thomas.Fossati@arm.com>
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Subject: Re: [Rats] Fwd: New Version Notification for draft-birkholz-rats-reference-interaction-model-03.txt
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On 2020-07-08 08:52, Henk Birkholz wrote:
> Hi list,

Hi Henk,

> 
> this version of the reference interaction models I-D now includes the
> three main models that are used across several related documents:
> 
> * challenge/response remote attestation (charra)
> * uni-directional remote attestation, and
> * streaming remote attestation

This is great but I don't see that the session-based attestation concept[1] used in Saturn[2,3], is covered by this I-D.

Best regards,
Anders

1] https://cyberphone.github.io/doc/research/session-based-remote-attestation.pdf

2] https://cyberphone.github.io/openbankingwallet
3] https://cyberphone.github.io/doc/security/keygen2.html

> 
> New diagrams for all three interaction models can be found in section 8:
> 
>> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model#section-8
> 
> As an attester's identity is vital to all interaction models in RATS --
> but also has severe implications -- we welcome Liqun and Chris as
> co-authors. They are experts for direct anonymous attestation (DAA) and
> remote attestation in general.
> 
> An overview about DAA can be found in section 5:
> 
>> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model#section-5
> 
> 
> Viele Grüße,
> 
> Henk
> 
> 
> -------- Forwarded Message --------
> Subject: New Version Notification for
> draft-birkholz-rats-reference-interaction-model-03.txt
> Date: Tue, 7 Jul 2020 23:41:20 -0700
> From: internet-drafts@ietf.org
> To: Liqun Chen <liqun.chen@surrey.ac.uk>, Michael Eckel
> <michael.eckel@sit.fraunhofer.de>, Christopher Newton
> <cn0016@surrey.ac.uk>, Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
> 
> 
> A new version of I-D, draft-birkholz-rats-reference-interaction-model-03.txt
> has been successfully submitted by Henk Birkholz and posted to the
> IETF repository.
> 
> Name:		draft-birkholz-rats-reference-interaction-model
> Revision:	03
> Title:		Reference Interaction Models for Remote Attestation Procedures
> Document date:	2020-07-08
> Group:		Individual Submission
> Pages:		22
> URL:
> https://www.ietf.org/internet-drafts/draft-birkholz-rats-reference-interaction-model-03.txt
> Status:
> https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interaction-model/
> Htmlized:
> https://tools.ietf.org/html/draft-birkholz-rats-reference-interaction-model-03
> Htmlized:
> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model
> Diff:
> https://www.ietf.org/rfcdiff?url2=draft-birkholz-rats-reference-interaction-model-03
> 
> Abstract:
>      This document describes interaction models for remote attestation
>      procedures (RATS).  Three conveying mechanisms - Challenge/Response,
>      Uni-Directional, and Streaming Remote Attestation - are illustrated
>      and defined.  Analogously, a general overview about the information
>      elements typically used by corresponding conveyance protocols are
>      highlighted.  Privacy preserving conveyance of Evidence via Direct
>      Anonymous Attestation is elaborated on for each interaction model,
>      individually.
> 
>   
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> The IETF Secretariat
> 
> 
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
> 


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To: Anders Rundgren <anders.rundgren.net@gmail.com>, "rats@ietf.org" <rats@ietf.org>
CC: Guy Fedorkow <gfedorkow@juniper.net>, Thomas Fossati <Thomas.Fossati@arm.com>
References: <159419048015.6220.17040386001147920084@ietfa.amsl.com> <56890b74-3b90-fe6f-720c-32f407dc312b@sit.fraunhofer.de> <041629bc-b2a9-fa01-9a0e-cacd783afc53@gmail.com>
From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Rats] Fwd: New Version Notification for draft-birkholz-rats-reference-interaction-model-03.txt
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Hi Anders,

thanks for your reach-out :) As far as I know, session-based creation of 
evidence is map-able to every kind of interaction model. I'll quickly 
illustrate how I think that typically works. Please step in, if I am 
erring here.

Session-based remote attestation "bundles" a certain amount of 
"evidence-generating primitive operations" of an Attesting Environment 
in a way that corresponding results are packaged in relative large set 
of Claims collected over time - in one piece of evidence.

Some solutions call these bundles audit sessions. If these bundles 
constitute evidence that can represent past states, some solutions call 
the resulting evidence secure audit logs.

Looking at the referenced write-up [1], the audit approach seems to be 
combined with a roll-back feature. That is an implementation feature for 
remediation that is typically not directly in-scope of RATS. But - RATS 
of course play a vital role in assessing the need for & and the result 
of remediation procedures, as well as selecting appropriate remediation 
procedures in the first place (see TEEP).

In summary, my early feedback is that the illustrated Protected API can 
be mapped to all three interaction model - it was probably designed with 
CHARRA in mind. Maybe it is useful to note here that a subscription 
session is not the same thing as an audit session.


Viele Grüße,

Henk

On 08.07.20 13:17, Anders Rundgren wrote:
> On 2020-07-08 08:52, Henk Birkholz wrote:
>> Hi list,
> 
> Hi Henk,
> 
>>
>> this version of the reference interaction models I-D now includes the
>> three main models that are used across several related documents:
>>
>> * challenge/response remote attestation (charra)
>> * uni-directional remote attestation, and
>> * streaming remote attestation
> 
> This is great but I don't see that the session-based attestation 
> concept[1] used in Saturn[2,3], is covered by this I-D.
> 
> Best regards,
> Anders
> 
> 1] 
> https://cyberphone.github.io/doc/research/session-based-remote-attestation.pdf 
> 
> 
> 2] https://cyberphone.github.io/openbankingwallet
> 3] https://cyberphone.github.io/doc/security/keygen2.html
> 
>>
>> New diagrams for all three interaction models can be found in section 8:
>>
>>> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model#section-8 
>>>
>>
>> As an attester's identity is vital to all interaction models in RATS --
>> but also has severe implications -- we welcome Liqun and Chris as
>> co-authors. They are experts for direct anonymous attestation (DAA) and
>> remote attestation in general.
>>
>> An overview about DAA can be found in section 5:
>>
>>> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model#section-5 
>>>
>>
>>
>> Viele Grüße,
>>
>> Henk
>>
>>
>> -------- Forwarded Message --------
>> Subject: New Version Notification for
>> draft-birkholz-rats-reference-interaction-model-03.txt
>> Date: Tue, 7 Jul 2020 23:41:20 -0700
>> From: internet-drafts@ietf.org
>> To: Liqun Chen <liqun.chen@surrey.ac.uk>, Michael Eckel
>> <michael.eckel@sit.fraunhofer.de>, Christopher Newton
>> <cn0016@surrey.ac.uk>, Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
>>
>>
>> A new version of I-D, 
>> draft-birkholz-rats-reference-interaction-model-03.txt
>> has been successfully submitted by Henk Birkholz and posted to the
>> IETF repository.
>>
>> Name:        draft-birkholz-rats-reference-interaction-model
>> Revision:    03
>> Title:        Reference Interaction Models for Remote Attestation 
>> Procedures
>> Document date:    2020-07-08
>> Group:        Individual Submission
>> Pages:        22
>> URL:
>> https://www.ietf.org/internet-drafts/draft-birkholz-rats-reference-interaction-model-03.txt 
>>
>> Status:
>> https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interaction-model/ 
>>
>> Htmlized:
>> https://tools.ietf.org/html/draft-birkholz-rats-reference-interaction-model-03 
>>
>> Htmlized:
>> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model 
>>
>> Diff:
>> https://www.ietf.org/rfcdiff?url2=draft-birkholz-rats-reference-interaction-model-03 
>>
>>
>> Abstract:
>>      This document describes interaction models for remote attestation
>>      procedures (RATS).  Three conveying mechanisms - Challenge/Response,
>>      Uni-Directional, and Streaming Remote Attestation - are illustrated
>>      and defined.  Analogously, a general overview about the information
>>      elements typically used by corresponding conveyance protocols are
>>      highlighted.  Privacy preserving conveyance of Evidence via Direct
>>      Anonymous Attestation is elaborated on for each interaction model,
>>      individually.
>>
>>
>>
>> Please note that it may take a couple of minutes from the time of 
>> submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> The IETF Secretariat
>>
>>
>> _______________________________________________
>> RATS mailing list
>> RATS@ietf.org
>> https://www.ietf.org/mailman/listinfo/rats
>>
> 


From nobody Wed Jul  8 07:14:20 2020
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To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, "rats@ietf.org" <rats@ietf.org>
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From: Anders Rundgren <anders.rundgren.net@gmail.com>
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Subject: Re: [Rats] Fwd: New Version Notification for draft-birkholz-rats-reference-interaction-model-03.txt
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On 2020-07-08 14:24, Henk Birkholz wrote:
> Hi Anders,

Hi Henk,

> 
> thanks for your reach-out :) As far as I know, session-based creation of
> evidence is map-able to every kind of interaction model. I'll quickly
> illustrate how I think that typically works. Please step in, if I am
> erring here.
> 
> Session-based remote attestation "bundles" a certain amount of
> "evidence-generating primitive operations" of an Attesting Environment
> in a way that corresponding results are packaged in relative large set
> of Claims collected over time - in one piece of evidence.

It is possible that you can characterize session-based remote attestations
like that but at least in my case the goal is different because it is only
about creating a secure session with an entity that has an attested quality.
The protected API is subsequently used for executing arbitrary secure
operations that for some reasons must be performed in a specific sequence.

This is pretty much a carbon copy of smart card provisioning where a session
is created based on an embedded key which indirectly provides attestation
(the card must be known).  The difference is that session-based remote
attestation does not presume a explicit knowledge of each trusted container.
The rollback feature is another enhancement.

It's not a big deal w.r.t. to the I-D, but it might be worth knowing anyway :)

Regards,
Anders

> 
> Some solutions call these bundles audit sessions. If these bundles
> constitute evidence that can represent past states, some solutions call
> the resulting evidence secure audit logs.
> 
> Looking at the referenced write-up [1], the audit approach seems to be
> combined with a roll-back feature. That is an implementation feature for
> remediation that is typically not directly in-scope of RATS. But - RATS
> of course play a vital role in assessing the need for & and the result
> of remediation procedures, as well as selecting appropriate remediation
> procedures in the first place (see TEEP).
> 
> In summary, my early feedback is that the illustrated Protected API can
> be mapped to all three interaction model - it was probably designed with
> CHARRA in mind. Maybe it is useful to note here that a subscription
> session is not the same thing as an audit session.
> 
> 
> Viele Grüße,
> 
> Henk
> 
> On 08.07.20 13:17, Anders Rundgren wrote:
>> On 2020-07-08 08:52, Henk Birkholz wrote:
>>> Hi list,
>>
>> Hi Henk,
>>
>>>
>>> this version of the reference interaction models I-D now includes the
>>> three main models that are used across several related documents:
>>>
>>> * challenge/response remote attestation (charra)
>>> * uni-directional remote attestation, and
>>> * streaming remote attestation
>>
>> This is great but I don't see that the session-based attestation
>> concept[1] used in Saturn[2,3], is covered by this I-D.
>>
>> Best regards,
>> Anders
>>
>> 1]
>> https://cyberphone.github.io/doc/research/session-based-remote-attestation.pdf
>>
>>
>> 2] https://cyberphone.github.io/openbankingwallet
>> 3] https://cyberphone.github.io/doc/security/keygen2.html
>>
>>>
>>> New diagrams for all three interaction models can be found in section 8:
>>>
>>>> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model#section-8
>>>>
>>>
>>> As an attester's identity is vital to all interaction models in RATS --
>>> but also has severe implications -- we welcome Liqun and Chris as
>>> co-authors. They are experts for direct anonymous attestation (DAA) and
>>> remote attestation in general.
>>>
>>> An overview about DAA can be found in section 5:
>>>
>>>> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model#section-5
>>>>
>>>
>>>
>>> Viele Grüße,
>>>
>>> Henk
>>>
>>>
>>> -------- Forwarded Message --------
>>> Subject: New Version Notification for
>>> draft-birkholz-rats-reference-interaction-model-03.txt
>>> Date: Tue, 7 Jul 2020 23:41:20 -0700
>>> From: internet-drafts@ietf.org
>>> To: Liqun Chen <liqun.chen@surrey.ac.uk>, Michael Eckel
>>> <michael.eckel@sit.fraunhofer.de>, Christopher Newton
>>> <cn0016@surrey.ac.uk>, Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
>>>
>>>
>>> A new version of I-D,
>>> draft-birkholz-rats-reference-interaction-model-03.txt
>>> has been successfully submitted by Henk Birkholz and posted to the
>>> IETF repository.
>>>
>>> Name:        draft-birkholz-rats-reference-interaction-model
>>> Revision:    03
>>> Title:        Reference Interaction Models for Remote Attestation
>>> Procedures
>>> Document date:    2020-07-08
>>> Group:        Individual Submission
>>> Pages:        22
>>> URL:
>>> https://www.ietf.org/internet-drafts/draft-birkholz-rats-reference-interaction-model-03.txt
>>>
>>> Status:
>>> https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interaction-model/
>>>
>>> Htmlized:
>>> https://tools.ietf.org/html/draft-birkholz-rats-reference-interaction-model-03
>>>
>>> Htmlized:
>>> https://datatracker.ietf.org/doc/html/draft-birkholz-rats-reference-interaction-model
>>>
>>> Diff:
>>> https://www.ietf.org/rfcdiff?url2=draft-birkholz-rats-reference-interaction-model-03
>>>
>>>
>>> Abstract:
>>>       This document describes interaction models for remote attestation
>>>       procedures (RATS).  Three conveying mechanisms - Challenge/Response,
>>>       Uni-Directional, and Streaming Remote Attestation - are illustrated
>>>       and defined.  Analogously, a general overview about the information
>>>       elements typically used by corresponding conveyance protocols are
>>>       highlighted.  Privacy preserving conveyance of Evidence via Direct
>>>       Anonymous Attestation is elaborated on for each interaction model,
>>>       individually.
>>>
>>>
>>>
>>> Please note that it may take a couple of minutes from the time of
>>> submission
>>> until the htmlized version and diff are available at tools.ietf.org.
>>>
>>> The IETF Secretariat
>>>
>>>
>>> _______________________________________________
>>> RATS mailing list
>>> RATS@ietf.org
>>> https://www.ietf.org/mailman/listinfo/rats
>>>
>>


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From: Thomas Fossati <Thomas.Fossati@arm.com>
To: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
CC: "rats@ietf.org" <rats@ietf.org>, Thomas Fossati <Thomas.Fossati@arm.com>
Thread-Topic: [Rats] FW: New Version Notification for draft-shaw-rats-rear-00.txt
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Subject: Re: [Rats] FW: New Version Notification for draft-shaw-rats-rear-00.txt
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Subject: Re: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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--Apple-Mail=_E9C70140-818A-4CC6-86E0-D14668E9F711
Content-Transfer-Encoding: quoted-printable
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	charset=utf-8

What is PII and what is not PII is almost entirely dependent on the =
end-end use case and who the relying party is.

Illustrative example: The UEID (serial number) of a device is definitely =
PII when using a web browser to access multiple web sites, but it is not =
when a router is attesting to the network management center. Even the =
web browser case is not clear cut. The UEID (serial number) might not be =
considered PII when accessing a banks web site, because you=E2=80=99ve =
told the bank to =E2=80=9Cremember this device=E2=80=9D (and the bank =
knows everything about you anyway).

I don=E2=80=99t think we can have a flag indicating which data is PII in =
Attestation Evidence/Results. I don=E2=80=99t think we can say that this =
particular EAT claim is PII and that one is not in any absolute sense.

We can=E2=80=99t assume that the Verifier will always be trusted with =
PII, because sometimes it is run by the relying party. =20

On the other hand, sometimes the Verifier will be a highly trusted =
privacy proxy. It will receive claims that are not privacy-preserving =
and strip them out or otherwise anonymize them before sending on to the =
relying party.

I think at both the architecture and EAT levels, the best we can do is =
write privacy considerations =E2=80=94 things that should be considered =
for particular deployments. Maybe future IETF standards that are very =
specific to use cases will be able to be more specific, but that=E2=80=99s=
 for later.

Most of the text in section 11 of the -04 draft seems OK, but I think =
additional text like this is needed and hopefully addresses Kathleen=E2=80=
=99s comments.

Every claim in Attestation Evidence and Attestation Results is =
potentially PII (Personally Identifying Information) depending on the =
end-end use case of the attestation. Each deployment of attestation must =
take into account how each claim may or may not be used in a privacy =
violating manner by the relying parties receiving the attestation.

In cases where the device sending attestation is owned by the relying =
party, little to no consideration for privacy is needed. In other cases, =
such as when a mobile phone is used to access a large number of web =
sites, apps and services, privacy must be considered very thoroughly.

These are some strategies that can be used to address the privacy issue:

* Determine that a particular claim is not privacy violating in the =
limited context of use. For example, a router sending its serial number =
to the network management center that owns the router violates no =
one=E2=80=99s privacy.

* Simply omit the claim. For example, omit the serial number from =
attestations sent by a phone to web sites it connects to.

* Prompt the user. For example, ask the user if it is OK for a =
particular web site to access location data.

* Use a privacy proxy service between the device and the relying party =
to remove or anonymize the privacy violating claims.

Other strategies than these may be used. The selection of strategy is =
highly dependent on the relying party, end use case and governmental =
regulation (e.g., GDPR). The selection of strategy may also vary =
claim-by-claim in a single attestation.


LL


--Apple-Mail=_E9C70140-818A-4CC6-86E0-D14668E9F711
Content-Transfer-Encoding: quoted-printable
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	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">What =
is PII and what is not PII is almost entirely dependent on the end-end =
use case and who the relying party is.<div class=3D""><br =
class=3D""></div><div class=3D"">Illustrative example: The UEID (serial =
number) of a device is definitely PII when using a web browser to access =
multiple web sites, but it is not when a router is attesting to the =
network management center. Even the web browser case is not clear cut. =
The UEID (serial number) might not be considered PII when accessing a =
banks web site, because you=E2=80=99ve told the bank to =E2=80=9Cremember =
this device=E2=80=9D (and the bank knows everything about you =
anyway).</div><div class=3D""><br class=3D""></div><div class=3D"">I =
don=E2=80=99t think we can have a flag indicating which data is PII in =
Attestation Evidence/Results. I don=E2=80=99t think we can say that this =
particular EAT claim is PII and that one is not in any absolute =
sense.</div><div class=3D""><br class=3D""></div><div class=3D"">We =
can=E2=80=99t assume that the Verifier will always be trusted with PII, =
because sometimes it is run by the relying party. &nbsp;</div><div =
class=3D""><br class=3D""></div><div class=3D"">On the other hand, =
sometimes the Verifier will be a highly trusted privacy proxy. It will =
receive claims that are not privacy-preserving and strip them out or =
otherwise anonymize them before sending on to the relying =
party.</div><div class=3D""><br class=3D""></div><div class=3D"">I think =
at both the architecture and EAT levels, the best we can do is write =
privacy considerations =E2=80=94 things that should be considered for =
particular deployments. Maybe future IETF standards that are very =
specific to use cases will be able to be more specific, but that=E2=80=99s=
 for later.</div><div class=3D""><br class=3D""></div><div class=3D"">Most=
 of the text in section 11 of the -04 draft seems OK, but I think =
additional text like this is needed and hopefully addresses Kathleen=E2=80=
=99s comments.</div><div class=3D""><br class=3D""></div><blockquote =
style=3D"margin: 0 0 0 40px; border: none; padding: 0px;" class=3D""><div =
class=3D"">Every claim in Attestation Evidence and Attestation Results =
is potentially PII (Personally Identifying Information) depending on the =
end-end use case of the attestation. Each deployment of attestation must =
take into account how each claim may or may not be used in a privacy =
violating manner by the relying parties receiving the =
attestation.</div><div class=3D""><br class=3D""></div><div class=3D"">In =
cases where the device sending attestation is owned by the relying =
party, little to no consideration for privacy is needed. In other cases, =
such as when a mobile phone is used to access a large number of web =
sites, apps and services, privacy must be considered very =
thoroughly.</div><div class=3D""><br class=3D""></div><div =
class=3D"">These are some strategies that can be used to address the =
privacy issue:</div><div class=3D""><br class=3D""></div><div class=3D"">*=
 Determine that a particular claim is not privacy violating in the =
limited context of use. For example, a router sending its serial number =
to the network management center that owns the router violates no =
one=E2=80=99s privacy.</div><div class=3D""><br class=3D""></div><div =
class=3D"">* Simply omit the claim. For example, omit the serial number =
from attestations sent by a phone to web sites it connects to.</div><div =
class=3D""><br class=3D""></div><div class=3D"">* Prompt the user. For =
example, ask the user if it is OK for a particular web site to access =
location data.</div><div class=3D""><br class=3D""></div><div class=3D"">*=
 Use a privacy proxy service between the device and the relying party to =
remove or anonymize the privacy violating claims.</div><div class=3D""><br=
 class=3D""></div><div class=3D"">Other strategies than these may be =
used. The selection of strategy is highly dependent on the relying =
party, end use case and governmental regulation (e.g., GDPR). The =
selection of strategy may also vary claim-by-claim in a single =
attestation.</div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">LL</div><div =
class=3D""><br class=3D""></div></body></html>=

--Apple-Mail=_E9C70140-818A-4CC6-86E0-D14668E9F711--


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--=-=-=
Content-Type: text/plain


Thomas Fossati <Thomas.Fossati@arm.com> wrote:
    > I hadn't come across SCAP before.  This looks interesting and certainly
    > relevant, so thanks for pointing out the potential relation with our
    > draft.

    > On 06/07/2020, 15:41, "Kathleen Moriarty" <kathleen.moriarty.ietf@gmail.com> wrote:
    >> Since we have a number of RESTful protocols in use to exchange
    >> formatted data, it would be good to explicitly state support for these
    >> protocols.  SCAPv2.0 has adopted ROLIE [RFC8322].  Since SCAP is how
    >> posture assessment is performed, it would be good to include this
    >> capability to enable a smooth transition to the use of remote
    >> attestation for simplified posture assessment as this work evolves.

    > Clarifying question.  In principle, the mechanics specified in the draft
    > can be used to bind attestation data to *any* resource.  So, ROLIE feeds
    > are certainly in scope.  However, it seems to me that in the SCAP
    > architecture the "natural" attestors are the Endpoints.  And, on the
    > Endpoint, posture collection is pulled using one of NEA/SWIMA, or
    > NETCONF, or some other specific MDM protocol, depending on the
    > Endpoint's type/class.  So, wouldn't NETCONF be a more suitable target
    > than ROLIE in this case?

However, we did do:

https://github.com/ietf-rats-wg/architecture/commit/87561f0cf9e65fcdda18291123367f6500c92ceb

 In this diagram, the protocol between Attester and a Relying Party
 can be any new or existing protocol (e.g., HTTP(S), COAP(S),
+ROLIE {{RFC8322}},
 802.1x, OPC UA, etc.), depending on the use case.  Such
 protocols typically already have mechanisms for passing security
 information for purposes of authentication and authorization.  Common

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-

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From: Ira McDonald <blueroofmusic@gmail.com>
Date: Wed, 8 Jul 2020 18:02:38 -0400
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To: Laurence Lundblade <lgl@island-resort.com>, Ira McDonald <blueroofmusic@gmail.com>
Cc: Thomas Fossati <Thomas.Fossati@arm.com>, Michael Richardson <mcr+ietf@sandelman.ca>,  Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>, "rats@ietf.org" <rats@ietf.org>
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Subject: Re: [Rats] should Evidence containers be explicit about Personally Identiable Information?
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Hi Laurence,

+1 to your whole rationale and suggested text.

Cheers,
- Ira


*Ira McDonald (Musician / Software Architect)Co-Chair - TCG Trusted
Mobility Solutions WG*

*Co-Chair - TCG Metadata Access Protocol SG*








*Chair - Linux Foundation Open Printing WGSecretary - IEEE-ISTO Printer
Working GroupCo-Chair - IEEE-ISTO PWG Internet Printing Protocol WGIETF
Designated Expert - IPP & Printer MIBBlue Roof Music / High North
Inchttp://sites.google.com/site/blueroofmusic
<http://sites.google.com/site/blueroofmusic>http://sites.google.com/site/hi=
ghnorthinc
<http://sites.google.com/site/highnorthinc>mailto: blueroofmusic@gmail.com
<blueroofmusic@gmail.com>(permanent) PO Box 221  Grand Marais, MI 49839
906-494-2434*


On Wed, Jul 8, 2020 at 3:38 PM Laurence Lundblade <lgl@island-resort.com>
wrote:

> What is PII and what is not PII is almost entirely dependent on the
> end-end use case and who the relying party is.
>
> Illustrative example: The UEID (serial number) of a device is definitely
> PII when using a web browser to access multiple web sites, but it is not
> when a router is attesting to the network management center. Even the web
> browser case is not clear cut. The UEID (serial number) might not be
> considered PII when accessing a banks web site, because you=E2=80=99ve to=
ld the
> bank to =E2=80=9Cremember this device=E2=80=9D (and the bank knows everyt=
hing about you
> anyway).
>
> I don=E2=80=99t think we can have a flag indicating which data is PII in
> Attestation Evidence/Results. I don=E2=80=99t think we can say that this =
particular
> EAT claim is PII and that one is not in any absolute sense.
>
> We can=E2=80=99t assume that the Verifier will always be trusted with PII=
, because
> sometimes it is run by the relying party.
>
> On the other hand, sometimes the Verifier will be a highly trusted privac=
y
> proxy. It will receive claims that are not privacy-preserving and strip
> them out or otherwise anonymize them before sending on to the relying par=
ty.
>
> I think at both the architecture and EAT levels, the best we can do is
> write privacy considerations =E2=80=94 things that should be considered f=
or
> particular deployments. Maybe future IETF standards that are very specifi=
c
> to use cases will be able to be more specific, but that=E2=80=99s for lat=
er.
>
> Most of the text in section 11 of the -04 draft seems OK, but I think
> additional text like this is needed and hopefully addresses Kathleen=E2=
=80=99s
> comments.
>
> Every claim in Attestation Evidence and Attestation Results is potentiall=
y
> PII (Personally Identifying Information) depending on the end-end use cas=
e
> of the attestation. Each deployment of attestation must take into account
> how each claim may or may not be used in a privacy violating manner by th=
e
> relying parties receiving the attestation.
>
> In cases where the device sending attestation is owned by the relying
> party, little to no consideration for privacy is needed. In other cases,
> such as when a mobile phone is used to access a large number of web sites=
,
> apps and services, privacy must be considered very thoroughly.
>
> These are some strategies that can be used to address the privacy issue:
>
> * Determine that a particular claim is not privacy violating in the
> limited context of use. For example, a router sending its serial number t=
o
> the network management center that owns the router violates no one=E2=80=
=99s
> privacy.
>
> * Simply omit the claim. For example, omit the serial number from
> attestations sent by a phone to web sites it connects to.
>
> * Prompt the user. For example, ask the user if it is OK for a particular
> web site to access location data.
>
> * Use a privacy proxy service between the device and the relying party to
> remove or anonymize the privacy violating claims.
>
> Other strategies than these may be used. The selection of strategy is
> highly dependent on the relying party, end use case and governmental
> regulation (e.g., GDPR). The selection of strategy may also vary
> claim-by-claim in a single attestation.
>
>
>
> LL
>
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
>

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<div dir=3D"ltr"><div>Hi Laurence,</div><div><br></div><div>+1 to your whol=
e rationale and suggested text.</div><div><br></div><div>Cheers,</div><div>=
- Ira</div><div><br></div><div><div><div dir=3D"ltr" class=3D"gmail_signatu=
re" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"lt=
r"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><=
div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=
=3D"ltr"><i><font size=3D"1">Ira McDonald (Musician / Software Architect)<b=
r>Co-Chair - TCG Trusted Mobility Solutions WG</font></i></div><div><i><fon=
t size=3D"1">Co-Chair - TCG Metadata Access Protocol SG<br></font></i></div=
><div dir=3D"ltr"><i><font size=3D"1">Chair - Linux Foundation Open Printin=
g WG<br>Secretary - IEEE-ISTO Printer Working Group<br>Co-Chair - IEEE-ISTO=
 PWG Internet Printing Protocol WG<br>IETF Designated Expert - IPP &amp; Pr=
inter MIB<br>Blue Roof Music / High North Inc<br><a style=3D"color:rgb(51,5=
1,255)" href=3D"http://sites.google.com/site/blueroofmusic" target=3D"_blan=
k">http://sites.google.com/site/blueroofmusic</a><br><a style=3D"color:rgb(=
102,0,204)" href=3D"http://sites.google.com/site/highnorthinc" target=3D"_b=
lank">http://sites.google.com/site/highnorthinc</a><br>mailto: <a href=3D"m=
ailto:blueroofmusic@gmail.com" target=3D"_blank">blueroofmusic@gmail.com</a=
><br>(permanent) PO Box 221=C2=A0 Grand Marais, MI 49839=C2=A0 906-494-2434=
</font></i></div></div></div></div></div></div></div></div></div></div></di=
v></div></div></div></div></div></div></div></div><br></div></div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 8, =
2020 at 3:38 PM Laurence Lundblade &lt;<a href=3D"mailto:lgl@island-resort.=
com">lgl@island-resort.com</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex"><div style=3D"overflow-wrap: break-word;">What is=
 PII and what is not PII is almost entirely dependent on the end-end use ca=
se and who the relying party is.<div><br></div><div>Illustrative example: T=
he UEID (serial number) of a device is definitely PII when using a web brow=
ser to access multiple web sites, but it is not when a router is attesting =
to the network management center. Even the web browser case is not clear cu=
t. The UEID (serial number) might not be considered PII when accessing a ba=
nks web site, because you=E2=80=99ve told the bank to =E2=80=9Cremember thi=
s device=E2=80=9D (and the bank knows everything about you anyway).</div><d=
iv><br></div><div>I don=E2=80=99t think we can have a flag indicating which=
 data is PII in Attestation Evidence/Results. I don=E2=80=99t think we can =
say that this particular EAT claim is PII and that one is not in any absolu=
te sense.</div><div><br></div><div>We can=E2=80=99t assume that the Verifie=
r will always be trusted with PII, because sometimes it is run by the relyi=
ng party. =C2=A0</div><div><br></div><div>On the other hand, sometimes the =
Verifier will be a highly trusted privacy proxy. It will receive claims tha=
t are not privacy-preserving and strip them out or otherwise anonymize them=
 before sending on to the relying party.</div><div><br></div><div>I think a=
t both the architecture and EAT levels, the best we can do is write privacy=
 considerations =E2=80=94 things that should be considered for particular d=
eployments. Maybe future IETF standards that are very specific to use cases=
 will be able to be more specific, but that=E2=80=99s for later.</div><div>=
<br></div><div>Most of the text in section 11 of the -04 draft seems OK, bu=
t I think additional text like this is needed and hopefully addresses Kathl=
een=E2=80=99s comments.</div><div><br></div><blockquote style=3D"margin:0px=
 0px 0px 40px;border:medium none;padding:0px"><div>Every claim in Attestati=
on Evidence and Attestation Results is potentially PII (Personally Identify=
ing Information) depending on the end-end use case of the attestation. Each=
 deployment of attestation must take into account how each claim may or may=
 not be used in a privacy violating manner by the relying parties receiving=
 the attestation.</div><div><br></div><div>In cases where the device sendin=
g attestation is owned by the relying party, little to no consideration for=
 privacy is needed. In other cases, such as when a mobile phone is used to =
access a large number of web sites, apps and services, privacy must be cons=
idered very thoroughly.</div><div><br></div><div>These are some strategies =
that can be used to address the privacy issue:</div><div><br></div><div>* D=
etermine that a particular claim is not privacy violating in the limited co=
ntext of use. For example, a router sending its serial number to the networ=
k management center that owns the router violates no one=E2=80=99s privacy.=
</div><div><br></div><div>* Simply omit the claim. For example, omit the se=
rial number from attestations sent by a phone to web sites it connects to.<=
/div><div><br></div><div>* Prompt the user. For example, ask the user if it=
 is OK for a particular web site to access location data.</div><div><br></d=
iv><div>* Use a privacy proxy service between the device and the relying pa=
rty to remove or anonymize the privacy violating claims.</div><div><br></di=
v><div>Other strategies than these may be used. The selection of strategy i=
s highly dependent on the relying party, end use case and governmental regu=
lation (e.g., GDPR). The selection of strategy may also vary claim-by-claim=
 in a single attestation.</div></blockquote><div><br></div><div><br></div><=
div>LL</div><div><br></div></div>__________________________________________=
_____<br>
RATS mailing list<br>
<a href=3D"mailto:RATS@ietf.org" target=3D"_blank">RATS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/rats" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/rats</a><br>
</blockquote></div>

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From: "Panwei (William)" <william.panwei@huawei.com>
To: "Eric Voit (evoit)" <evoit@cisco.com>
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Subject: [Rats] Comments on the changes of CHARRA YANG module
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Hi Eric,

I've read the YANG modules you changed, actually I didn't get how the new m=
odules worked when I read it the first time. After reading it a few times a=
nd discussion with others, I kind of figured out how it worked:

1.     The Verifier (or Relying Party) uses the "rats-support-structures" d=
atastore structure to retrieve the hardware information, i.e., all the comp=
ute-nodes and all the TPMs, from the Attester. Then the Verifier can establ=
ish the relationship between the TPM and its compute-node info and certific=
ates info. Further, the Verifier can identify the TPM according to the cert=
ificate-name and/or the compute-node.

2.     Next, the Verifier uses the RPC structures to get Evidence in a chal=
lenge-response fashion. In the challenge input, the Verifier can use the le=
af "key-identifier" to ask Evidence of one specific TPM based on this TPM's=
 unique credential, or it can use the leaf-list "tpm-name" to ask Evidence =
of one or more TPMs based on these TPMs' names.

3.     In the response output, the Attester returns the Evidence. If the in=
put contains only one TPM, then the output can match that TPM anyway. But i=
f the input contains several "tpm-name", then the output is a set of Eviden=
ce of these TPMs, in this situation, the Verifier needs to use the "certifi=
cate-name" and/or "node-id" in each Evidence to identify which TPM produced=
 it.

If my understanding is right, then the YANG modules after changed have some=
 assumptions which aren't explicitly said, I conclude them below:

1.     The Verifier must retrieve the datastore first before initiate the c=
hallenge request.

2.     Every TPM should have a unique name, at least be unique in an Attest=
er.

3.     Every certificate should have a unique name. It should be unique in =
an Attester if the certificate-name can identify the TPM, or should be uniq=
ue in a compute node if the certificate-name and the node-id are used toget=
her to identify the TPM.

4.     For the input, if you choose to use the "key-identifier", then the l=
ist-leaf "tpm-name" must have only one value.
My suggestion would be to have a section to describe the workflow or the ex=
ample of how to use this YANG module. Also, explicitly pointing out the ass=
umptions would be much better.

Generally, I agree with the idea that don't use nested keys to identify the=
 TPM (and its position) in RPCs. This has a significant benefit of scalabil=
ity. Because if in the future more dimensions are needed to identify the TP=
M (and its position), the RPC structures don't need to be changed, only mod=
ifying the datastore structure is enough. But the current RPCs also have a =
disadvantage that the key is very obscure and implicit, for example, you ne=
ed to use "certificate-name" and "node-id" as the key in the output. I sugg=
est that we can just use the "tpm-name" as the key of output. Two advantage=
s would be: easier for readers to understand, the Verifier doesn't need to =
search the database to find out the matched TPM.

Other comments:

1.     Some elements in the "rats-support-structures" are changed from read=
-only to read-write, e.g., the "supported-algos" and "certificates" of TPM.=
 Why these elements can be configured now?

2.     The outputs of RPC "tpm12-challenge-response-attestation" and "tpm20=
-challenge-response-attestation" contains the "node-id" and "node-physical-=
index". Can these two elements be omitted in the output? Because they can b=
e get through the datastore.

3.     The output of RPC "log-retrieval" doesn't contain the "node-id" or "=
node-physical-index", and this is different with the outputs of other two R=
PCs. I wonder whether here is right and other two RPCs need to delete the t=
wo elements.

Regards & Thanks!
Wei Pan

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<body lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72" style=3D"text-justi=
fy-trim:punctuation">
<div class=3D"WordSection1">
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif">Hi Eric,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif">I&#8217;ve read the YANG modules you changed, actually I didn&#82=
17;t get how the new modules worked when I read it the first time.
 After reading it a few times and discussion with others, I kind of figured=
 out how it worked:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 =
level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">The Verifier=
 (or Relying Party) uses the &#8220;rats-support-structures&#8221; datastor=
e structure to retrieve the hardware information, i.e., all
 the compute-nodes and all the TPMs, from the Attester. Then the Verifier c=
an establish the relationship between the TPM and its compute-node info and=
 certificates info. Further, the Verifier can identify the TPM according to=
 the certificate-name and/or the
 compute-node.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 =
level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">Next, the Ve=
rifier uses the RPC structures to get Evidence in a challenge-response fash=
ion. In the challenge input, the Verifier can
 use the leaf &#8220;key-identifier&#8221; to ask Evidence of one specific =
TPM based on this TPM&#8217;s unique credential, or it can use the leaf-lis=
t &#8220;tpm-name&#8221; to ask Evidence of one or more TPMs based on these=
 TPMs&#8217; names.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 =
level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">In the respo=
nse output, the Attester returns the Evidence. If the input contains only o=
ne TPM, then the output can match that TPM anyway.
 But if the input contains several &#8220;tpm-name&#8221;, then the output =
is a set of Evidence of these TPMs, in this situation, the Verifier needs t=
o use the &#8220;certificate-name&#8221; and/or &#8220;node-id&#8221; in ea=
ch Evidence to identify which TPM produced it.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif">If my understanding is right, then the YANG modules after changed=
 have some assumptions which aren&#8217;t explicitly said,
 I conclude them below:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 =
level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">The Verifier=
 must retrieve the datastore first before initiate the challenge request.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 =
level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">Every TPM sh=
ould have a unique name, at least be unique in an Attester.<o:p></o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 =
level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">Every certif=
icate should have a unique name. It should be unique in an Attester if the =
certificate-name can identify the TPM, or should
 be unique in a compute node if the certificate-name and the node-id are us=
ed together to identify the TPM.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 =
level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">For the inpu=
t, if you choose to use the &#8220;key-identifier&#8221;, then the list-lea=
f &#8220;tpm-name&#8221; must have only one value.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif">My suggestion would be to have a section to describe the workflow=
 or the example of how to use this YANG module. Also,
 explicitly pointing out the assumptions would be much better.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif">Generally, I agree with the idea that don&#8217;t use nested keys=
 to identify the TPM (and its position) in RPCs. This has
 a significant benefit of scalability. Because if in the future more dimens=
ions are needed to identify the TPM (and its position), the RPC structures =
don&#8217;t need to be changed, only modifying the datastore structure is e=
nough. But the current RPCs also have
 a disadvantage that the key is very obscure and implicit, for example, you=
 need to use &#8220;certificate-name&#8221; and &#8220;node-id&#8221; as th=
e key in the output. I suggest that we can just use the &#8220;tpm-name&#82=
21; as the key of output. Two advantages would be: easier for readers
 to understand, the Verifier doesn&#8217;t need to search the database to f=
ind out the matched TPM.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif">Other comments:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l2 =
level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">Some element=
s in the &#8220;rats-support-structures&#8221; are changed from read-only t=
o read-write, e.g., the &#8220;supported-algos&#8221; and &#8220;certificat=
es&#8221;
 of TPM. Why these elements can be configured now?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l2 =
level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">The outputs =
of RPC &#8220;tpm12-challenge-response-attestation&#8221; and &#8220;tpm20-=
challenge-response-attestation&#8221; contains the &#8220;node-id&#8221; an=
d &#8220;node-physical-index&#8221;.
 Can these two elements be omitted in the output? Because they can be get t=
hrough the datastore.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:0cm;margin-right:=
0cm;margin-bottom:3.6pt;margin-left:18.0pt;text-indent:-18.0pt;mso-list:l2 =
level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:11.0pt;line-he=
ight:120%;font-family:&quot;Gadugi&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:11.0=
pt;line-height:120%;font-family:&quot;Gadugi&quot;,sans-serif">The output o=
f RPC &#8220;log-retrieval&#8221; doesn&#8217;t contain the &#8220;node-id&=
#8221; or &#8220;node-physical-index&#8221;, and this is different with the=
 outputs of other
 two RPCs. I wonder whether here is right and other two RPCs need to delete=
 the two elements.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.6pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:11.0pt;line-height:120%;font-family:&quot;Gadugi&quot;,sa=
ns-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"margin-bottom:3.6pt;text-ali=
gn:left;line-height:110%">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;line-height:110%;font-family=
:&quot;Gadugi&quot;,sans-serif;color:black">Regards &amp; Thanks!<o:p></o:p=
></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"margin-bottom:3.6pt;text-ali=
gn:left;line-height:110%">
<span lang=3D"EN-US" style=3D"font-size:11.0pt;line-height:110%;font-family=
:&quot;Gadugi&quot;,sans-serif;color:black">Wei Pan<o:p></o:p></span></p>
</div>
</body>
</html>

--_000_4e2e0b53d2be47009b1958758620914chuaweicom_--


From nobody Fri Jul 10 07:45:42 2020
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Remote ATtestation ProcedureS WG of the IETF.

        Title           : Remote Attestation Procedures Architecture
        Authors         : Henk Birkholz
                          Dave Thaler
                          Michael Richardson
                          Ned Smith
                          Wei Pan
	Filename        : draft-ietf-rats-architecture-05.txt
	Pages           : 36
	Date            : 2020-07-10

Abstract:
   In network protocol exchanges, it is often the case that one entity
   (a Relying Party) requires evidence about a remote peer to assess the
   peer's trustworthiness, and a way to appraise such evidence.  The
   evidence is typically a set of claims about its software and hardware
   platform.  This document describes an architecture for such remote
   attestation procedures (RATS).


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rats-architecture/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rats-architecture-05
https://datatracker.ietf.org/doc/html/draft-ietf-rats-architecture-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rats-architecture-05


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/



From nobody Fri Jul 10 08:13:33 2020
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--=-=-=
Content-Type: text/plain


internet-drafts@ietf.org wrote:
    > A New Internet-Draft is available from the on-line Internet-Drafts directories.
    > This draft is a work item of the Remote ATtestation ProcedureS WG of the IETF.

    > Title           : Remote Attestation Procedures Architecture
    > Authors         : Henk Birkholz
    > Dave Thaler
    > Michael Richardson
    > Ned Smith
    > Wei Pan
    > Filename        : draft-ietf-rats-architecture-05.txt
    > Pages           : 36
    > Date            : 2020-07-10

    > Abstract:
    > In network protocol exchanges, it is often the case that one entity
    > (a Relying Party) requires evidence about a remote peer to assess the
    > peer's trustworthiness, and a way to appraise such evidence.  The
    > evidence is typically a set of claims about its software and hardware
    > platform.  This document describes an architecture for such remote
    > attestation procedures (RATS).


    > The IETF datatracker status page for this draft is:
    > https://datatracker.ietf.org/doc/draft-ietf-rats-architecture/

    > There are also htmlized versions available at:
    > https://tools.ietf.org/html/draft-ietf-rats-architecture-05
    > https://datatracker.ietf.org/doc/html/draft-ietf-rats-architecture-05

    > A diff from the previous version is available at:
    > https://www.ietf.org/rfcdiff?url2=draft-ietf-rats-architecture-05

Hi, this is the result of a lot of consensus building among the authors and
contributors.  (Which reminds me that I probably need to update the list of
contributors)

We noticed one nit, "HD" remains in a table: we intend to add text that
explains it, but we feel the text should reference a document which the
WG has not (yet!?) decided to adopt.

Please review the diffs.
We believe that the document is "feature complete", but that there are some
sections where some would like to say more.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-

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--=-=-=--


From nobody Sat Jul 11 18:06:55 2020
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--=-=-=
Content-Type: text/plain


Because the calendaring systems are often not very clear about what stuff
changed, I'll clarify that we are *not* meeting on July 14, and we do
not intend to meet again until after IETF108.

   <insert Doctor Demento laugh, for those who remember 1980s radio. For the
   rest, there is wikipedia>

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-




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From nobody Sun Jul 12 11:34:16 2020
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Remote ATtestation ProcedureS WG of the IETF.

        Title           : TPM-based Network Device Remote Integrity Verification
        Authors         : Guy Fedorkow
                          Eric Voit
                          Jessica Fitzgerald-McKay
	Filename        : draft-ietf-rats-tpm-based-network-device-attest-01.txt
	Pages           : 38
	Date            : 2020-07-12

Abstract:
   This document describes a workflow for remote attestation of the
   integrity of network devices.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rats-tpm-based-network-device-attest/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rats-tpm-based-network-device-attest-01
https://datatracker.ietf.org/doc/html/draft-ietf-rats-tpm-based-network-device-attest-01

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Hi,

This document is cogent for the recent discussion on tagging of PII.

Cheers,
- Ira

---------- Forwarded message ---------
From: Sandeep Rao <sandeeprao.ietf@gmail.com>
Date: Mon, Jul 13, 2020 at 1:07 PM
Subject: [Pearg] Fwd: New Version Notification for draft-rao-pitfol-02.txt
To: <pearg@irtf.org>


Hi All,


Here=E2=80=99s updated version of Personal Information Tagging for Logs

https://www.ietf.org/internet-drafts/draft-rao-pitfol-02.txt


Key updates in this version are:

   1. Model for structured logging and use of standardized identifiers for
   personal information.
   2. Illustration of Personal Information Identifiers Registry and
   associating sensitivity level for each identifier..
   3. Role based Redaction and access control
   4. Considerations on log transformations and identified ToDo work on
   handling log privacy changes.

Appreciate your review comments and feedback.


Thanks

-Sandeep


---------- Forwarded message ---------
From: <internet-drafts@ietf.org>
Date: Mon, Jul 13, 2020 at 10:21 PM
Subject: New Version Notification for draft-rao-pitfol-02.txt
To: Shivan Sahib <shivankaulsahib@gmail.com>, Sandeep Rao <
sandeeprao.ietf@gmail.com>, Santhosh C N <santoshcn1@gmail.com>, Ryan Guest
<rguest@salesforce.com>



A new version of I-D, draft-rao-pitfol-02.txt
has been successfully submitted by Sandeep Rao and posted to the
IETF repository.

Name:           draft-rao-pitfol
Revision:       02
Title:          Personal Information Tagging for Logs
Document date:  2020-07-13
Group:          Individual Submission
Pages:          11
URL:            https://www.ietf.org/internet-drafts/draft-rao-pitfol-02.tx=
t
Status:         https://datatracker.ietf.org/doc/draft-rao-pitfol/
Htmlized:       https://tools.ietf.org/html/draft-rao-pitfol-02
Htmlized:       https://datatracker.ietf.org/doc/html/draft-rao-pitfol
Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-rao-pitfol-02

Abstract:
   Software systems typically generate log messages in the course of
   their operation.  These log messages (or 'logs') record events as
   they happen, thus providing a trail that can be used to understand
   the state of the system and help with troubleshooting issues.  Given
   that logs try to capture state that is useful for monitoring and
   debugging, they can contain information that can be used to identify
   users.  Personal data identification and anonymization in logs is
   crucial to ensure that no personal data is being inadvertently logged
   and retained which would make the logging system run afoul of laws
   around storing private information.  This document focuses on
   exploring mechanisms that can be used by a generating or intermediary
   logging service to specify personal or sensitive data in log
   message(s), thus allowing a downstream logging server to potentially
   enforce any redaction or transformation.





Please note that it may take a couple of minutes from the time of submissio=
n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


--=20
Pearg mailing list
Pearg@irtf.org
https://www.irtf.org/mailman/listinfo/pearg

--000000000000e8e55905aa55cc22
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<div dir=3D"ltr"><div>Hi,</div><div><br></div><div>This document is cogent =
for the recent discussion on tagging of PII.<br></div><div><div><div dir=3D=
"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=
=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr">=
<div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div=
 dir=3D"ltr"><div><br></div></div></div></div></div></div></div></div></div=
></div></div></div></div></div></div></div></div></div>Cheers,</div><div>- =
Ira</div><div></div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cl=
ass=3D"gmail_attr">---------- Forwarded message ---------<br>From: <b class=
=3D"gmail_sendername" dir=3D"auto">Sandeep Rao</b> <span dir=3D"auto">&lt;<=
a href=3D"mailto:sandeeprao.ietf@gmail.com">sandeeprao.ietf@gmail.com</a>&g=
t;</span><br>Date: Mon, Jul 13, 2020 at 1:07 PM<br>Subject: [Pearg] Fwd: Ne=
w Version Notification for draft-rao-pitfol-02.txt<br>To:  &lt;<a href=3D"m=
ailto:pearg@irtf.org">pearg@irtf.org</a>&gt;<br></div><br><br><div dir=3D"l=
tr"><p style=3D"font-variant-numeric:normal;font-variant-east-asian:normal;=
font-stretch:normal;font-size:12px;line-height:normal;font-family:&quot;Hel=
vetica Neue&quot;;margin:0px">Hi All,</p><p style=3D"font-variant-numeric:n=
ormal;font-variant-east-asian:normal;font-stretch:normal;font-size:12px;lin=
e-height:normal;font-family:&quot;Helvetica Neue&quot;;margin:0px;min-heigh=
t:14px"><br></p><p style=3D"font-variant-numeric:normal;font-variant-east-a=
sian:normal;font-stretch:normal;font-size:12px;line-height:normal;font-fami=
ly:&quot;Helvetica Neue&quot;;margin:0px">Here=E2=80=99s updated version of=
 Personal Information Tagging for Logs</p><p style=3D"font-variant-numeric:=
normal;font-variant-east-asian:normal;font-stretch:normal;font-size:12px;li=
ne-height:normal;font-family:&quot;Helvetica Neue&quot;;margin:0px;color:rg=
b(220,161,13)"><span style=3D"text-decoration-line:underline"><a href=3D"ht=
tps://www.ietf.org/internet-drafts/draft-rao-pitfol-02.txt" target=3D"_blan=
k">https://www.ietf.org/internet-drafts/draft-rao-pitfol-02.txt</a></span><=
/p><p style=3D"font-variant-numeric:normal;font-variant-east-asian:normal;f=
ont-stretch:normal;font-size:12px;line-height:normal;font-family:&quot;Helv=
etica Neue&quot;;margin:0px;min-height:14px"><span style=3D"text-decoration=
-line:underline"></span><br></p><p style=3D"font-variant-numeric:normal;fon=
t-variant-east-asian:normal;font-stretch:normal;font-size:12px;line-height:=
normal;font-family:&quot;Helvetica Neue&quot;;margin:0px">Key updates in th=
is version are:<br></p><ol><li style=3D"margin:0px;font-variant-numeric:nor=
mal;font-variant-east-asian:normal;font-stretch:normal;font-size:12px;line-=
height:normal;font-family:&quot;Helvetica Neue&quot;">Model for structured =
logging and use of standardized identifiers for personal information.</li><=
li style=3D"margin:0px;font-variant-numeric:normal;font-variant-east-asian:=
normal;font-stretch:normal;font-size:12px;line-height:normal;font-family:&q=
uot;Helvetica Neue&quot;">Illustration of Personal Information Identifiers =
Registry and associating sensitivity level for each identifier..</li><li st=
yle=3D"margin:0px;font-variant-numeric:normal;font-variant-east-asian:norma=
l;font-stretch:normal;font-size:12px;line-height:normal;font-family:&quot;H=
elvetica Neue&quot;">Role based Redaction and access control</li><li style=
=3D"margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;f=
ont-stretch:normal;font-size:12px;line-height:normal;font-family:&quot;Helv=
etica Neue&quot;">Considerations on log transformations and identified ToDo=
 work on handling log privacy changes.</li></ol><p style=3D"font-variant-nu=
meric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:1=
2px;line-height:normal;font-family:&quot;Helvetica Neue&quot;;margin:0px;mi=
n-height:14px">Appreciate your review comments and feedback.</p><p style=3D=
"font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:no=
rmal;font-size:12px;line-height:normal;font-family:&quot;Helvetica Neue&quo=
t;;margin:0px;min-height:14px"><br></p><p style=3D"font-variant-numeric:nor=
mal;font-variant-east-asian:normal;font-stretch:normal;font-size:12px;line-=
height:normal;font-family:&quot;Helvetica Neue&quot;;margin:0px">Thanks</p>=
<font color=3D"#888888"><p style=3D"margin:0px;font-variant-numeric:normal;=
font-variant-east-asian:normal;font-stretch:normal;font-size:12px;line-heig=
ht:normal;font-family:&quot;Helvetica Neue&quot;">-Sandeep</p></font><div s=
tyle=3D"outline:none;padding:10px 0px;width:22px;margin:2px 0px 0px"><br></=
div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">--=
-------- Forwarded message ---------<br>From: <span dir=3D"auto">&lt;<a hre=
f=3D"mailto:internet-drafts@ietf.org" target=3D"_blank">internet-drafts@iet=
f.org</a>&gt;</span><br>Date: Mon, Jul 13, 2020 at 10:21 PM<br>Subject: New=
 Version Notification for draft-rao-pitfol-02.txt<br>To: Shivan Sahib &lt;<=
a href=3D"mailto:shivankaulsahib@gmail.com" target=3D"_blank">shivankaulsah=
ib@gmail.com</a>&gt;, Sandeep Rao &lt;<a href=3D"mailto:sandeeprao.ietf@gma=
il.com" target=3D"_blank">sandeeprao.ietf@gmail.com</a>&gt;, Santhosh C N &=
lt;<a href=3D"mailto:santoshcn1@gmail.com" target=3D"_blank">santoshcn1@gma=
il.com</a>&gt;, Ryan Guest &lt;<a href=3D"mailto:rguest@salesforce.com" tar=
get=3D"_blank">rguest@salesforce.com</a>&gt;<br></div><br><br><br>
A new version of I-D, draft-rao-pitfol-02.txt<br>
has been successfully submitted by Sandeep Rao and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-rao-pitfol<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A002<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Personal Information Tagging for L=
ogs<br>
Document date:=C2=A0 2020-07-13<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 11<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-rao-pitfol-02.txt" rel=3D"noreferrer" target=3D"_b=
lank">https://www.ietf.org/internet-drafts/draft-rao-pitfol-02.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-rao-pitfol/" rel=3D"noreferrer" target=3D"_blank">https://d=
atatracker.ietf.org/doc/draft-rao-pitfol/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-rao-pitfol-02" rel=3D"noreferrer" target=3D"_blank">https://tools.iet=
f.org/html/draft-rao-pitfol-02</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-rao-pitfol" rel=3D"noreferrer" target=3D"_blank">https://da=
tatracker.ietf.org/doc/html/draft-rao-pitfol</a><br>
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/rfcdiff?url2=3Ddraft-rao-pitfol-02" rel=3D"noreferrer" target=3D"_blank"=
>https://www.ietf.org/rfcdiff?url2=3Ddraft-rao-pitfol-02</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0Software systems typically generate log messages in the course=
 of<br>
=C2=A0 =C2=A0their operation.=C2=A0 These log messages (or &#39;logs&#39;) =
record events as<br>
=C2=A0 =C2=A0they happen, thus providing a trail that can be used to unders=
tand<br>
=C2=A0 =C2=A0the state of the system and help with troubleshooting issues.=
=C2=A0 Given<br>
=C2=A0 =C2=A0that logs try to capture state that is useful for monitoring a=
nd<br>
=C2=A0 =C2=A0debugging, they can contain information that can be used to id=
entify<br>
=C2=A0 =C2=A0users.=C2=A0 Personal data identification and anonymization in=
 logs is<br>
=C2=A0 =C2=A0crucial to ensure that no personal data is being inadvertently=
 logged<br>
=C2=A0 =C2=A0and retained which would make the logging system run afoul of =
laws<br>
=C2=A0 =C2=A0around storing private information.=C2=A0 This document focuse=
s on<br>
=C2=A0 =C2=A0exploring mechanisms that can be used by a generating or inter=
mediary<br>
=C2=A0 =C2=A0logging service to specify personal or sensitive data in log<b=
r>
=C2=A0 =C2=A0message(s), thus allowing a downstream logging server to poten=
tially<br>
=C2=A0 =C2=A0enforce any redaction or transformation.<br>
<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
<br>
<br>
</div></div>
-- <br>
Pearg mailing list<br>
<a href=3D"mailto:Pearg@irtf.org" target=3D"_blank">Pearg@irtf.org</a><br>
<a href=3D"https://www.irtf.org/mailman/listinfo/pearg" rel=3D"noreferrer" =
target=3D"_blank">https://www.irtf.org/mailman/listinfo/pearg</a><br>
</div></div></div>

--000000000000e8e55905aa55cc22--


From nobody Mon Jul 13 10:56:00 2020
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Subject: [Rats] I-D Action: draft-ietf-rats-tpm-based-network-device-attest-02.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Remote ATtestation ProcedureS WG of the IETF.

        Title           : TPM-based Network Device Remote Integrity Verification
        Authors         : Guy Fedorkow
                          Eric Voit
                          Jessica Fitzgerald-McKay
	Filename        : draft-ietf-rats-tpm-based-network-device-attest-02.txt
	Pages           : 38
	Date            : 2020-07-13

Abstract:
   This document describes a workflow for remote attestation of the
   integrity of network devices.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rats-tpm-based-network-device-attest/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rats-tpm-based-network-device-attest-02
https://datatracker.ietf.org/doc/html/draft-ietf-rats-tpm-based-network-device-attest-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rats-tpm-based-network-device-attest-02


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/



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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: "Panwei (William)" <william.panwei@huawei.com>
CC: "rats@ietf.org" <rats@ietf.org>
Thread-Topic: Comments on the changes of CHARRA YANG module
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Subject: [Rats] FW: Comments on the changes of CHARRA YANG module
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Including the 'rats' alias.  I missed this in the original response...

-----Original Message-----
From: Eric Voit (evoit) 
Sent: Friday, July 10, 2020 11:24 AM
To: Panwei (William) <william.panwei@huawei.com>
Cc: rats-chairs@ietf.org
Subject: RE: Comments on the changes of CHARRA YANG module

Hi Wei Pan,

Thanks for the comments.  Some thoughts in-line...

> From: Panwei (William), July 10, 2020 6:39 AM
> 
> Hi Eric,
> 
> I've read the YANG modules you changed, actually I didn't get how the new
> modules worked when I read it the first time. After reading it a few times
> and discussion with others, I kind of figured out how it worked:

It seems like it would be good to add some text which explains common
operations outside of the YANG model.   I will propose some text to the
draft based on your thoughts lower in the thread.  

> 1. The Verifier (or Relying Party) uses the "rats-support-structures"
> datastore structure to retrieve the hardware information, i.e., all the
> compute-nodes and all the TPMs, from the Attester. Then the Verifier can
> establish the relationship between the TPM and its compute-node info and
> certificates info. Further, the Verifier can identify the TPM according to
> the certificate-name and/or the compute-node.

Yes.  A large benefit we don't send redundant information in a continuous
set of RPC replies.    And by sending the certificate as the unique
identifier, it becomes easy to handle certificate upgrades, as when you see
a new certificate being used, you then can retrieve the information from the
Attester.

> 2. Next, the Verifier uses the RPC structures to get Evidence in a
> challenge-response fashion. In the challenge input, the Verifier can use
the
> leaf "key-identifier" to ask Evidence of one specific TPM based on this
> TPM's unique credential, or it can use the leaf-list "tpm-name" to ask
> Evidence of one or more TPMs based on these TPMs' names.

The absence of either should result in the acquisition of PCR information
for all physical TPMs.  This is a benefit from the previous version where we
explicitly had a 'tpm-name' of 'ALL'.  That is the purpose of the YANG model
text:

        "Name of one or more unique TPMs on a device.  If this object
exists,
        a selection should pull only the objects related to these TPM(s).
If
        it does not exist, all qualifying TPMs that are 'hardware-based'
        equals true on the device are selected.";

> 3. In the response output, the Attester returns the Evidence. If the input
> contains only one TPM, then the output can match that TPM anyway. But if
> the
> input contains several "tpm-name", then the output is a set of Evidence of
> these TPMs, in this situation, the Verifier needs to use the
> "certificate-name" and/or "node-id" in each Evidence to identify which TPM
> produced it.

This is correct.

> If my understanding is right, then the YANG modules after changed have
> some
> assumptions which aren't explicitly said, I conclude them below:
> 1. The Verifier must retrieve the datastore first before initiate the
> challenge request.

With the current version, this is not the case.  (As there is not a required
key of 'tpm-name' mandatory in the RPC.)

What needs to happen is that there is a secure method of provisioning on the
certificate on the Verifier.  And if you receive an unknown certificate, you
have a choice of how to then acquire that information.   The current YANG
model points to ' ietf-keystore.yang' as a potential place to get that
information.

> 2. Every TPM should have a unique name, at least be unique in an Attester.

Yes.  And this could be a random system generated string.  It cannot be a
TPM path, as this could change on a reboot.

> 3. Every certificate should have a unique name. It should be unique in an
> Attester if the certificate-name can identify the TPM, or should be unique
> in a compute node if the certificate-name and the node-id are used
together
> to identify the TPM.

The certificate-name should be unique within a Attester.  I will add that as
a constraint to the YANG model via XPATH.  Good catch, I had not explicitly
said this is required.

> 4. For the input, if you choose to use the "key-identifier", then the
> list-leaf "tpm-name" must have only one value.
> My suggestion would be to have a section to describe the workflow or the
> example of how to use this YANG module. Also, explicitly pointing out the
> assumptions would be much better.

I agree.  In fact, I would argue that you should not allow both
'key-identifier' and 'tpm-name*' in the same query.  What happen if they
conflict?   If you agree, we could make an explicitly choice allowing either
one or the other.  

> Generally, I agree with the idea that don't use nested keys to identify
the
> TPM (and its position) in RPCs. This has a significant benefit of
> scalability. Because if in the future more dimensions are needed to
identify
> the TPM (and its position), the RPC structures don't need to be changed,
> only modifying the datastore structure is enough. But the current RPCs
also
> have a disadvantage that the key is very obscure and implicit, 

I assert this is a very large benefit.  You do not have to identify the key
at all in the query.
 
> for example,
> you need to use "certificate-name" and "node-id" as the key in the output.
I
> suggest that we can just use the "tpm-name" as the key of output. 

'tpm-name' is an internal structure to the Attester, and need not be used by
the Verifier where there is only one TPM.  This is a significant benefit of
getting rid of the key.   And for implementations with only one TPM, life is
much simpler.

> Two
> advantages would be: easier for readers to understand, the Verifier
doesn't
> need to search the database to find out the matched TPM.

There is another simplifying advantage of the current structure.  When a
certificate changes, you then can simply fetch the corresponding tpm info
from the datastore.  Certificate management/upgrades should become easier.

> Other comments:
> 1. Some elements in the "rats-support-structures" are changed from read-
> only
> to read-write, e.g., the "supported-algos" and "certificates" of TPM. Why
> these elements can be configured now?

On "supported-algos":  an operator might want to limit the universe of
supported-algos from the full set which might be available from a vendor.

On "certificates":  YANG has some structural issues with how config data can
be exposed.  I believe that an Attesting device should allow new
certificates to be provisioned in a place like ' ietf-keystore.yang'.
However I am not sure if YANG allows non-config leafrefs to point to
configuration data.  I get an error if I try to make these objects system
generated.  Any suggestions on how automatically update things here?  I do
know there are implications to NMDA (RFC-8342).

> 2. The outputs of RPC "tpm12-challenge-response-attestation" and
> "tpm20-challenge-response-attestation" contains the "node-id" and
> "node-physical-index". Can these two elements be omitted in the output?
> Because they can be get through the datastore.

I believe these can be removed.  Perhaps we can ask everyone during the IETF
session if they have any objections?

> 3. The output of RPC "log-retrieval" doesn't contain the "node-id" or
> "node-physical-index", and this is different with the outputs of other two
> RPCs. I wonder whether here is right and other two RPCs need to delete the
> two elements.

Agree.   The answer to the above question should be true here as well.

Thanks!
Eric

> Regards & Thanks!
> Wei Pan

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From nobody Tue Jul 14 13:12:16 2020
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From: Laurence Lundblade <lgl@island-resort.com>
In-Reply-To: <815D0226-CCEE-4581-B705-08CB744CD176@cisco.com>
Date: Tue, 14 Jul 2020 13:12:07 -0700
Cc: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, "rats@ietf.org" <rats@ietf.org>
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References: <42199E8C-59F6-46F5-9F10-0D7AD89E9121@cisco.com> <993a5dad-4a1f-eafe-913f-67b461039f86@sit.fraunhofer.de> <815D0226-CCEE-4581-B705-08CB744CD176@cisco.com>
To: "Nancy Cam-Winget (ncamwing)" <ncamwing=40cisco.com@dmarc.ietf.org>
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Subject: Re: [Rats] IETF 108 Call for agenda items
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I would like 20 minutes to present a taxonomy of attestation keys and =
key identification schemes. This is relevant to RATS Architecture and to =
EAT design for key identification.

Thank you!

LL


> On Jul 6, 2020, at 2:37 PM, Nancy Cam-Winget (ncamwing) =
<ncamwing=3D40cisco.com@dmarc.ietf.org> wrote:
>=20
> Thanks for the requests Henk!  A clarification (or three):
> 1. Are you requesting the *ed (e.g. first 3) occur in the first =
session?
> 2. The *ed block is in the sequence you want them to flow?
> 3. Are you the presenter for all the requested slots below?
>=20
> Warm regards, Nancy
>=20
> =EF=BB=BFOn 7/6/20, 2:25 PM, "Henk Birkholz" =
<henk.birkholz@sit.fraunhofer.de> wrote:
>=20
>    Hi Nancy,
>=20
>    I'd like to request:
>=20
>    * Reference Interaction Models - 10 min (*)
>    * YANG module for CHARRA/TPM - 10 min (*)
>    * Attestation Event Stream Subscription - 10 min (*)
>    * RATS Architecture - 15 min
>    * "SUIT/TEEP Evidence & Attestation Result Claims" - 10 min
>    * Update on UCCS - 10 min
>=20
>    Viele Gr=C3=BC=C3=9Fe,
>=20
>    Henk
>=20
>    p.s. the (*) items should be en bloc and in sequence (first =
session), please
>=20
>    On 06.07.20 23:07, Nancy Cam-Winget (ncamwing) wrote:
>> Hello RATs members,
>>=20
>> We will be meeting on Tuesday July 28 13:00-13:50UTC  and Wednesday =
July=20
>> 29 11am-12:40pm UTC.
>>=20
>> This is a call for agenda, so if you have a topic to present please =
let=20
>> the chairs (rats-chairs@ietf.org <mailto:rats-chairs@ietf.org>) know=20=

>> your topic and requested time.
>>=20
>> Thanks, Nancy
>>=20
>>=20
>> _______________________________________________
>> RATS mailing list
>> RATS@ietf.org
>> https://www.ietf.org/mailman/listinfo/rats
>>=20
>=20
>=20
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats


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From: "Nancy Cam-Winget (ncamwing)" <ncamwing@cisco.com>
To: "rats@ietf.org" <rats@ietf.org>
Thread-Topic: IETF 108 RATS agenda
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Subject: [Rats] IETF 108 RATS agenda
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From: Guy Fedorkow <gfedorkow@juniper.net>
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Subject: [Rats] TPM-based attestation
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We've checked in an updated copy of 

https://tools.ietf.org/html/draft-ietf-rats-tpm-based-network-device-attest-
02

and expect to have a short slot to discuss the modest changes during IETF
108.

 

  I think the doc will need another pass to align the terminology with the
RATS Architecture.  Henk, Ned, can you suggest when you think the
terminology in the Arch doc will be settled enough to make it worth
reviewing that specific topic/

 

  And if anyone sees topic areas that the document is not currently
addressing properly, please let us know.  Can't change it before IETF 108,
but if there are suggestions, we should discuss them on the July call.

 

  Thanks!

/guy

 

 


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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>We&#8217;ve =
checked in an updated copy of <o:p></o:p></p><p class=3DMsoNormal><a =
href=3D"https://tools.ietf.org/html/draft-ietf-rats-tpm-based-network-dev=
ice-attest-02">https://tools.ietf.org/html/draft-ietf-rats-tpm-based-netw=
ork-device-attest-02</a><o:p></o:p></p><p class=3DMsoNormal>and expect =
to have a short slot to discuss the modest changes during IETF =
108.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>&nbsp; I think the doc will need another pass to align =
the terminology with the RATS Architecture.&nbsp; Henk, Ned, can you =
suggest when you think the terminology in the Arch doc will be settled =
enough to make it worth reviewing that specific topic/<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>&nbsp; And =
if anyone sees topic areas that the document is not currently addressing =
properly, please let us know.&nbsp; Can&#8217;t change it before IETF =
108, but if there are suggestions, we should discuss them on the July =
call.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>&nbsp; Thanks!<o:p></o:p></p><p =
class=3DMsoNormal>/guy<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
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Subject: [Rats] IETF 108 RATS scribes - looking for volunteers
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Subject: [Rats] TPM at IETF
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We've checked in a new version of the Remote Integrity Verification document
at IETF, in preparation for the IETF 108 "Madrid" virtual meeting.  If
anyone wants to send comments, contact me or join rats@ietf.org

https://tools.ietf.org/html/draft-ietf-rats-tpm-based-network-device-attest-
02

 

Thx

/guy

 


Juniper Business Use Only


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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>We've checked in a new version of the Remote Integrity =
Verification document at IETF, in preparation for the IETF 108 =
&#8220;Madrid&#8221; virtual meeting.&nbsp; If anyone wants to send =
comments, contact me or join rats@ietf.org<o:p></o:p></p><p =
class=3DMsoNormal><a =
href=3D"https://tools.ietf.org/html/draft-ietf-rats-tpm-based-network-dev=
ice-attest-02">https://tools.ietf.org/html/draft-ietf-rats-tpm-based-netw=
ork-device-attest-02</a><o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Thx<o:p></o:p></p><p =
class=3DMsoNormal>/guy<o:p></o:p></p><p =
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Subject: [Rats] Where Do Interaction Models Go?
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Hi list,

our first virtual session on July 28th is approaching. At the last 
meeting, we highlighted the question: where do interaction models go?

Context: there are three quite common interaction models (plus minimal 
requirements and information elements for them) that can be used to 
convey RATS Conceptual Messages, such as Evidence or Attestation 
Results. Most Conceptual Messages should include only up-to-date content 
(commonly referred to as "fresh") to be feasible. As a result, 
interaction models directly support methods to show that content is 
fresh (challenge-response & streamed remote attestation) or don't have 
to because the content shows that by itself (time-based remote attestation).

Problem: Reiterating how the common models work and how they are related 
in every solution draft can prove to be error prone, ambiguous, 
difficult to compare in English, or simply be redundant.

Solution: Describing them once and then referencing the bulk of it 
eliminates the need for text cloning, danger of inconsistencies/subtle 
deviations, and redundancy in general.


The remaining question is: where should this content about interaction 
model go?


At the last meeting four options were presented:

* Option 1: standalone (one I-D for each model)
* Option 2: standalone (one I-D for all models)
* Option 3: all three models merged into the architecture I-D
* Option 4: each model merged into a separate solution I-D

Each option has pros and cons. So, I'd like to bring this question to 
the list (,finally... I can be quite slow).

There is of course the current reference interaction model I-D that 
talks about the three models and how direct anonymous attestation can be 
enabled by all three of them. Please have a quick look, maybe that helps 
to provide some feedback here :) Five drafts reference this one at the 
moment:

> https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interaction-model/

We will dedicate some time to this topic on Tuesday and hope for some 
feedback!


Viele Grüße,

Henk


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From: Ira McDonald <blueroofmusic@gmail.com>
Date: Thu, 23 Jul 2020 11:48:06 -0400
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To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, Ira McDonald <blueroofmusic@gmail.com>
Cc: "rats@ietf.org" <rats@ietf.org>
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Subject: Re: [Rats] Where Do Interaction Models Go?
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Hi,

I strongly favor option 2 (one I-D for all models).

Cheers,
- Ira


*Ira McDonald (Musician / Software Architect)Co-Chair - TCG Trusted
Mobility Solutions WG*

*Co-Chair - TCG Metadata Access Protocol SG*








*Chair - Linux Foundation Open Printing WGSecretary - IEEE-ISTO Printer
Working GroupCo-Chair - IEEE-ISTO PWG Internet Printing Protocol WGIETF
Designated Expert - IPP & Printer MIBBlue Roof Music / High North
Inchttp://sites.google.com/site/blueroofmusic
<http://sites.google.com/site/blueroofmusic>http://sites.google.com/site/hi=
ghnorthinc
<http://sites.google.com/site/highnorthinc>mailto: blueroofmusic@gmail.com
<blueroofmusic@gmail.com>(permanent) PO Box 221  Grand Marais, MI 49839
906-494-2434*


On Thu, Jul 23, 2020 at 9:08 AM Henk Birkholz <
henk.birkholz@sit.fraunhofer.de> wrote:

> Hi list,
>
> our first virtual session on July 28th is approaching. At the last
> meeting, we highlighted the question: where do interaction models go?
>
> Context: there are three quite common interaction models (plus minimal
> requirements and information elements for them) that can be used to
> convey RATS Conceptual Messages, such as Evidence or Attestation
> Results. Most Conceptual Messages should include only up-to-date content
> (commonly referred to as "fresh") to be feasible. As a result,
> interaction models directly support methods to show that content is
> fresh (challenge-response & streamed remote attestation) or don't have
> to because the content shows that by itself (time-based remote
> attestation).
>
> Problem: Reiterating how the common models work and how they are related
> in every solution draft can prove to be error prone, ambiguous,
> difficult to compare in English, or simply be redundant.
>
> Solution: Describing them once and then referencing the bulk of it
> eliminates the need for text cloning, danger of inconsistencies/subtle
> deviations, and redundancy in general.
>
>
> The remaining question is: where should this content about interaction
> model go?
>
>
> At the last meeting four options were presented:
>
> * Option 1: standalone (one I-D for each model)
> * Option 2: standalone (one I-D for all models)
> * Option 3: all three models merged into the architecture I-D
> * Option 4: each model merged into a separate solution I-D
>
> Each option has pros and cons. So, I'd like to bring this question to
> the list (,finally... I can be quite slow).
>
> There is of course the current reference interaction model I-D that
> talks about the three models and how direct anonymous attestation can be
> enabled by all three of them. Please have a quick look, maybe that helps
> to provide some feedback here :) Five drafts reference this one at the
> moment:
>
> >
> https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interactio=
n-model/
>
> We will dedicate some time to this topic on Tuesday and hope for some
> feedback!
>
>
> Viele Gr=C3=BC=C3=9Fe,
>
> Henk
>
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
>

--000000000000eddf8405ab1dc85a
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi,</div><div><br></div><div>I strongly favor option =
2 (one I-D for all models).</div><div><br></div><div>Cheers,</div><div>- Ir=
a</div><div><br></div><div><div><div dir=3D"ltr" class=3D"gmail_signature" =
data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><=
div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div =
dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"lt=
r"><i><font size=3D"1">Ira McDonald (Musician / Software Architect)<br>Co-C=
hair - TCG Trusted Mobility Solutions WG</font></i></div><div><i><font size=
=3D"1">Co-Chair - TCG Metadata Access Protocol SG<br></font></i></div><div =
dir=3D"ltr"><i><font size=3D"1">Chair - Linux Foundation Open Printing WG<b=
r>Secretary - IEEE-ISTO Printer Working Group<br>Co-Chair - IEEE-ISTO PWG I=
nternet Printing Protocol WG<br>IETF Designated Expert - IPP &amp; Printer =
MIB<br>Blue Roof Music / High North Inc<br><a style=3D"color:rgb(51,51,255)=
" href=3D"http://sites.google.com/site/blueroofmusic" target=3D"_blank">htt=
p://sites.google.com/site/blueroofmusic</a><br><a style=3D"color:rgb(102,0,=
204)" href=3D"http://sites.google.com/site/highnorthinc" target=3D"_blank">=
http://sites.google.com/site/highnorthinc</a><br>mailto: <a href=3D"mailto:=
blueroofmusic@gmail.com" target=3D"_blank">blueroofmusic@gmail.com</a><br>(=
permanent) PO Box 221=C2=A0 Grand Marais, MI 49839=C2=A0 906-494-2434</font=
></i></div></div></div></div></div></div></div></div></div></div></div></di=
v></div></div></div></div></div></div></div><br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Jul 23, 2020=
 at 9:08 AM Henk Birkholz &lt;<a href=3D"mailto:henk.birkholz@sit.fraunhofe=
r.de">henk.birkholz@sit.fraunhofer.de</a>&gt; wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex">Hi list,<br>
<br>
our first virtual session on July 28th is approaching. At the last <br>
meeting, we highlighted the question: where do interaction models go?<br>
<br>
Context: there are three quite common interaction models (plus minimal <br>
requirements and information elements for them) that can be used to <br>
convey RATS Conceptual Messages, such as Evidence or Attestation <br>
Results. Most Conceptual Messages should include only up-to-date content <b=
r>
(commonly referred to as &quot;fresh&quot;) to be feasible. As a result, <b=
r>
interaction models directly support methods to show that content is <br>
fresh (challenge-response &amp; streamed remote attestation) or don&#39;t h=
ave <br>
to because the content shows that by itself (time-based remote attestation)=
.<br>
<br>
Problem: Reiterating how the common models work and how they are related <b=
r>
in every solution draft can prove to be error prone, ambiguous, <br>
difficult to compare in English, or simply be redundant.<br>
<br>
Solution: Describing them once and then referencing the bulk of it <br>
eliminates the need for text cloning, danger of inconsistencies/subtle <br>
deviations, and redundancy in general.<br>
<br>
<br>
The remaining question is: where should this content about interaction <br>
model go?<br>
<br>
<br>
At the last meeting four options were presented:<br>
<br>
* Option 1: standalone (one I-D for each model)<br>
* Option 2: standalone (one I-D for all models)<br>
* Option 3: all three models merged into the architecture I-D<br>
* Option 4: each model merged into a separate solution I-D<br>
<br>
Each option has pros and cons. So, I&#39;d like to bring this question to <=
br>
the list (,finally... I can be quite slow).<br>
<br>
There is of course the current reference interaction model I-D that <br>
talks about the three models and how direct anonymous attestation can be <b=
r>
enabled by all three of them. Please have a quick look, maybe that helps <b=
r>
to provide some feedback here :) Five drafts reference this one at the <br>
moment:<br>
<br>
&gt; <a href=3D"https://datatracker.ietf.org/doc/draft-birkholz-rats-refere=
nce-interaction-model/" rel=3D"noreferrer" target=3D"_blank">https://datatr=
acker.ietf.org/doc/draft-birkholz-rats-reference-interaction-model/</a><br>
<br>
We will dedicate some time to this topic on Tuesday and hope for some <br>
feedback!<br>
<br>
<br>
Viele Gr=C3=BC=C3=9Fe,<br>
<br>
Henk<br>
<br>
_______________________________________________<br>
RATS mailing list<br>
<a href=3D"mailto:RATS@ietf.org" target=3D"_blank">RATS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/rats" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/rats</a><br>
</blockquote></div>

--000000000000eddf8405ab1dc85a--


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Subject: Re: [Rats] Where Do Interaction Models Go?
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I prefer Option 2 (one I-D for all models). This supports more 
consistent models

and is simpler to reference by other standards (which is the overall 
objective).

Monty Wiseman


On 7/23/20 11:48 AM, Ira McDonald wrote:
> Hi,
>
> I strongly favor option 2 (one I-D for all models).
>
> Cheers,
> - Ira
>
> /Ira McDonald (Musician / Software Architect)
> Co-Chair - TCG Trusted Mobility Solutions WG/
> /Co-Chair - TCG Metadata Access Protocol SG
> /
> /Chair - Linux Foundation Open Printing WG
> Secretary - IEEE-ISTO Printer Working Group
> Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
> IETF Designated Expert - IPP & Printer MIB
> Blue Roof Music / High North Inc
> http://sites.google.com/site/blueroofmusic
> http://sites.google.com/site/highnorthinc
> mailto: blueroofmusic@gmail.com <mailto:blueroofmusic@gmail.com>
> (permanent) PO Box 221  Grand Marais, MI 49839 906-494-2434/
>
>
> On Thu, Jul 23, 2020 at 9:08 AM Henk Birkholz 
> <henk.birkholz@sit.fraunhofer.de 
> <mailto:henk.birkholz@sit.fraunhofer.de>> wrote:
>
>     Hi list,
>
>     our first virtual session on July 28th is approaching. At the last
>     meeting, we highlighted the question: where do interaction models go?
>
>     Context: there are three quite common interaction models (plus
>     minimal
>     requirements and information elements for them) that can be used to
>     convey RATS Conceptual Messages, such as Evidence or Attestation
>     Results. Most Conceptual Messages should include only up-to-date
>     content
>     (commonly referred to as "fresh") to be feasible. As a result,
>     interaction models directly support methods to show that content is
>     fresh (challenge-response & streamed remote attestation) or don't
>     have
>     to because the content shows that by itself (time-based remote
>     attestation)..
>
>     Problem: Reiterating how the common models work and how they are
>     related
>     in every solution draft can prove to be error prone, ambiguous,
>     difficult to compare in English, or simply be redundant.
>
>     Solution: Describing them once and then referencing the bulk of it
>     eliminates the need for text cloning, danger of
>     inconsistencies/subtle
>     deviations, and redundancy in general.
>
>
>     The remaining question is: where should this content about
>     interaction
>     model go?
>
>
>     At the last meeting four options were presented:
>
>     * Option 1: standalone (one I-D for each model)
>     * Option 2: standalone (one I-D for all models)
>     * Option 3: all three models merged into the architecture I-D
>     * Option 4: each model merged into a separate solution I-D
>
>     Each option has pros and cons. So, I'd like to bring this question to
>     the list (,finally... I can be quite slow).
>
>     There is of course the current reference interaction model I-D that
>     talks about the three models and how direct anonymous attestation
>     can be
>     enabled by all three of them. Please have a quick look, maybe that
>     helps
>     to provide some feedback here :) Five drafts reference this one at
>     the
>     moment:
>
>     >
>     https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interaction-model/
>
>     We will dedicate some time to this topic on Tuesday and hope for some
>     feedback!
>
>
>     Viele Grüße,
>
>     Henk
>
>     _______________________________________________
>     RATS mailing list
>     RATS@ietf.org <mailto:RATS@ietf.org>
>     https://www.ietf.org/mailman/listinfo/rats
>
>
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats

--------------187C82502809E630E42B6A03
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    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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    <p>I prefer Option 2 (one I-D for all models). This supports more
      consistent models</p>
    <p>and is simpler to reference by other standards (which is the
      overall objective).</p>
    <p>Monty Wiseman<br>
    </p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">On 7/23/20 11:48 AM, Ira McDonald
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAN40gSuWfYa8dCA0-j0Y89qdNJaURt=eRDUs+mesFCUSLzcPRA@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div>Hi,</div>
        <div><br>
        </div>
        <div>I strongly favor option 2 (one I-D for all models).</div>
        <div><br>
        </div>
        <div>Cheers,</div>
        <div>- Ira</div>
        <div><br>
        </div>
        <div>
          <div>
            <div dir="ltr" class="gmail_signature"
              data-smartmail="gmail_signature">
              <div dir="ltr">
                <div>
                  <div dir="ltr">
                    <div>
                      <div dir="ltr">
                        <div>
                          <div dir="ltr">
                            <div>
                              <div dir="ltr">
                                <div>
                                  <div dir="ltr">
                                    <div>
                                      <div dir="ltr">
                                        <div>
                                          <div dir="ltr">
                                            <div>
                                              <div dir="ltr"><i><font
                                                    size="1">Ira
                                                    McDonald (Musician /
                                                    Software Architect)<br>
                                                    Co-Chair - TCG
                                                    Trusted Mobility
                                                    Solutions WG</font></i></div>
                                              <div><i><font size="1">Co-Chair
                                                    - TCG Metadata
                                                    Access Protocol SG<br>
                                                  </font></i></div>
                                              <div dir="ltr"><i><font
                                                    size="1">Chair -
                                                    Linux Foundation
                                                    Open Printing WG<br>
                                                    Secretary -
                                                    IEEE-ISTO Printer
                                                    Working Group<br>
                                                    Co-Chair - IEEE-ISTO
                                                    PWG Internet
                                                    Printing Protocol WG<br>
                                                    IETF Designated
                                                    Expert - IPP &amp;
                                                    Printer MIB<br>
                                                    Blue Roof Music /
                                                    High North Inc<br>
                                                    <a
                                                      style="color:rgb(51,51,255)"
href="http://sites.google.com/site/blueroofmusic" target="_blank"
                                                      moz-do-not-send="true">http://sites.google.com/site/blueroofmusic</a><br>
                                                    <a
                                                      style="color:rgb(102,0,204)"
href="http://sites.google.com/site/highnorthinc" target="_blank"
                                                      moz-do-not-send="true">http://sites.google.com/site/highnorthinc</a><br>
                                                    mailto: <a
                                                      href="mailto:blueroofmusic@gmail.com"
                                                      target="_blank"
                                                      moz-do-not-send="true">blueroofmusic@gmail.com</a><br>
                                                    (permanent) PO Box
                                                    221  Grand Marais,
                                                    MI 49839 
                                                    906-494-2434</font></i></div>
                                            </div>
                                          </div>
                                        </div>
                                      </div>
                                    </div>
                                  </div>
                                </div>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
          <br>
        </div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Thu, Jul 23, 2020 at 9:08
          AM Henk Birkholz &lt;<a
            href="mailto:henk.birkholz@sit.fraunhofer.de"
            moz-do-not-send="true">henk.birkholz@sit.fraunhofer.de</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi
          list,<br>
          <br>
          our first virtual session on July 28th is approaching. At the
          last <br>
          meeting, we highlighted the question: where do interaction
          models go?<br>
          <br>
          Context: there are three quite common interaction models (plus
          minimal <br>
          requirements and information elements for them) that can be
          used to <br>
          convey RATS Conceptual Messages, such as Evidence or
          Attestation <br>
          Results. Most Conceptual Messages should include only
          up-to-date content <br>
          (commonly referred to as "fresh") to be feasible. As a result,
          <br>
          interaction models directly support methods to show that
          content is <br>
          fresh (challenge-response &amp; streamed remote attestation)
          or don't have <br>
          to because the content shows that by itself (time-based remote
          attestation)..<br>
          <br>
          Problem: Reiterating how the common models work and how they
          are related <br>
          in every solution draft can prove to be error prone,
          ambiguous, <br>
          difficult to compare in English, or simply be redundant.<br>
          <br>
          Solution: Describing them once and then referencing the bulk
          of it <br>
          eliminates the need for text cloning, danger of
          inconsistencies/subtle <br>
          deviations, and redundancy in general.<br>
          <br>
          <br>
          The remaining question is: where should this content about
          interaction <br>
          model go?<br>
          <br>
          <br>
          At the last meeting four options were presented:<br>
          <br>
          * Option 1: standalone (one I-D for each model)<br>
          * Option 2: standalone (one I-D for all models)<br>
          * Option 3: all three models merged into the architecture I-D<br>
          * Option 4: each model merged into a separate solution I-D<br>
          <br>
          Each option has pros and cons. So, I'd like to bring this
          question to <br>
          the list (,finally... I can be quite slow).<br>
          <br>
          There is of course the current reference interaction model I-D
          that <br>
          talks about the three models and how direct anonymous
          attestation can be <br>
          enabled by all three of them. Please have a quick look, maybe
          that helps <br>
          to provide some feedback here :) Five drafts reference this
          one at the <br>
          moment:<br>
          <br>
          &gt; <a
href="https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interaction-model/"
            rel="noreferrer" target="_blank" moz-do-not-send="true">https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interaction-model/</a><br>
          <br>
          We will dedicate some time to this topic on Tuesday and hope
          for some <br>
          feedback!<br>
          <br>
          <br>
          Viele Grüße,<br>
          <br>
          Henk<br>
          <br>
          _______________________________________________<br>
          RATS mailing list<br>
          <a href="mailto:RATS@ietf.org" target="_blank"
            moz-do-not-send="true">RATS@ietf.org</a><br>
          <a href="https://www.ietf.org/mailman/listinfo/rats"
            rel="noreferrer" target="_blank" moz-do-not-send="true">https://www.ietf.org/mailman/listinfo/rats</a><br>
        </blockquote>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <pre class="moz-quote-pre" wrap="">_______________________________________________
RATS mailing list
<a class="moz-txt-link-abbreviated" href="mailto:RATS@ietf.org">RATS@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/rats">https://www.ietf.org/mailman/listinfo/rats</a>
</pre>
    </blockquote>
  </body>
</html>

--------------187C82502809E630E42B6A03--


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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
CC: "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] Where Do Interaction Models Go?
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Subject: Re: [Rats] Where Do Interaction Models Go?
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2 makes good sense.  This allows a common structure which can show the =
commonality between specific I-Ds.   It also doesn't overburden/slow =
closure on the architecture doc.

Eric

> Hi list,
>=20
> our first virtual session on July 28th is approaching. At the last =
meeting, we
> highlighted the question: where do interaction models go?
>=20
> Context: there are three quite common interaction models (plus minimal
> requirements and information elements for them) that can be used to
> convey RATS Conceptual Messages, such as Evidence or Attestation =
Results.
> Most Conceptual Messages should include only up-to-date content
> (commonly referred to as "fresh") to be feasible. As a result, =
interaction
> models directly support methods to show that content is fresh =
(challenge-
> response & streamed remote attestation) or don't have to because the
> content shows that by itself (time-based remote attestation).
>=20
> Problem: Reiterating how the common models work and how they are
> related in every solution draft can prove to be error prone, =
ambiguous,
> difficult to compare in English, or simply be redundant.
>=20
> Solution: Describing them once and then referencing the bulk of it =
eliminates
> the need for text cloning, danger of inconsistencies/subtle =
deviations, and
> redundancy in general.
>=20
>=20
> The remaining question is: where should this content about interaction
> model go?
>=20
>=20
> At the last meeting four options were presented:
>=20
> * Option 1: standalone (one I-D for each model)
> * Option 2: standalone (one I-D for all models)
> * Option 3: all three models merged into the architecture I-D
> * Option 4: each model merged into a separate solution I-D
>=20
> Each option has pros and cons. So, I'd like to bring this question to
> the list (,finally... I can be quite slow).
>=20
> There is of course the current reference interaction model I-D that
> talks about the three models and how direct anonymous attestation can =
be
> enabled by all three of them. Please have a quick look, maybe that =
helps
> to provide some feedback here :) Five drafts reference this one at the
> moment:
>=20
> > =
https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interactio=
n-
> model/
>=20
> We will dedicate some time to this topic on Tuesday and hope for some
> feedback!
>=20
>=20
> Viele Gr=C3=BC=C3=9Fe,
>=20
> Henk
>=20
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats

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To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] Where Do Interaction Models Go?
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Subject: Re: [Rats] Where Do Interaction Models Go?
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Hi Henk,
  I'm fine with Option 2 -- separate draft that doesn't impede closure =
of the Architecture draft.
/guy



Juniper Business Use Only

-----Original Message-----
From: RATS <rats-bounces@ietf.org> On Behalf Of Henk Birkholz
Sent: Thursday, July 23, 2020 9:08 AM
To: rats@ietf.org
Subject: [Rats] Where Do Interaction Models Go?

[External Email. Be cautious of content]


Hi list,

our first virtual session on July 28th is approaching. At the last =
meeting, we highlighted the question: where do interaction models go?

Context: there are three quite common interaction models (plus minimal =
requirements and information elements for them) that can be used to =
convey RATS Conceptual Messages, such as Evidence or Attestation =
Results. Most Conceptual Messages should include only up-to-date content =
(commonly referred to as "fresh") to be feasible. As a result, =
interaction models directly support methods to show that content is =
fresh (challenge-response & streamed remote attestation) or don't have =
to because the content shows that by itself (time-based remote =
attestation).

Problem: Reiterating how the common models work and how they are related =
in every solution draft can prove to be error prone, ambiguous, =
difficult to compare in English, or simply be redundant.

Solution: Describing them once and then referencing the bulk of it =
eliminates the need for text cloning, danger of inconsistencies/subtle =
deviations, and redundancy in general.


The remaining question is: where should this content about interaction =
model go?


At the last meeting four options were presented:

* Option 1: standalone (one I-D for each model)
* Option 2: standalone (one I-D for all models)
* Option 3: all three models merged into the architecture I-D
* Option 4: each model merged into a separate solution I-D

Each option has pros and cons. So, I'd like to bring this question to =
the list (,finally... I can be quite slow).

There is of course the current reference interaction model I-D that =
talks about the three models and how direct anonymous attestation can be =
enabled by all three of them. Please have a quick look, maybe that helps =
to provide some feedback here :) Five drafts reference this one at the
moment:

> https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-bir
> kholz-rats-reference-interaction-model/__;!!NEt6yMaO-gk!SYqBRt5nXIi2cw
> gezjeQbps4FpiEHZvAX2DbPXFG2ODk1Ck9LDvFE-AvEHZwiEJWJEs$

We will dedicate some time to this topic on Tuesday and hope for some =
feedback!


Viele Gr=C3=BC=C3=9Fe,

Henk

_______________________________________________
RATS mailing list
RATS@ietf.org
https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/rats__;=
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Subject: Re: [Rats] Where Do Interaction Models Go?
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From: Dave Thaler <dthaler@microsoft.com>
To: "Eric Voit (evoit)" <evoit=40cisco.com@dmarc.ietf.org>, "rats@ietf.org" <rats@ietf.org>
CC: Wei Pan <william.panwei@huawei.com>, "Birkholz, Henk" <henk.birkholz@sit.fraunhofer.de>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/sOPRRFSM8XGvrMAm1A-QwC8JdgM>
Subject: Re: [Rats] draft-birkholz-rats-network-device-subscription-00
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To: Dave Thaler <dthaler@microsoft.com>, "Eric Voit (evoit)" <evoit=40cisco.com@dmarc.ietf.org>, "rats@ietf.org" <rats@ietf.org>
CC: Wei Pan <william.panwei@huawei.com>
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From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Rats] draft-birkholz-rats-network-device-subscription-00
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Hi Dave,

a clarifying question:

What exactly do you mean by the "who" in "a subscriber knows who to 
subscribe to"?

The I-D does not come with its own join/rendezvous/discovery capability. 
That either comes related with YANG Push ("call home"). That would be a 
"who" on the entity level.

Another possibility is that you mean a YANG RPC with the "who"? That 
would be a "who" on the management interface level.

Or you could mean one of the Attesting Environment of a composite 
Attester. Tha would be a "who" on the Attester level. And that is done 
via the included data store.

Or do you mean something I am missing here?

Viele Grüße,

Henk

On 28.07.20 16:10, Dave Thaler wrote:
> I asked in the meeting how a subscriber knows who to subscribe to, and I believe the answer was
> that CHARRA answers that.  Well I looked in draft-ietf-rats-yang-tpm-charra-02 and it does not
> contain any mention of the subject.  I think one or the other of the two drafts needs to address
> this issue.  My preference is that it be in draft-birkholz-rats-network-device-subscription since
> that's the draft that talks about limitations like
>> Evidence is not streamed to an interested Verifier as soon as it is generated.
> Which certainly still applies, it's just another case... you didn't know to subscribe to it until
> after the evidence was generated when it booted.
> 
> Dave
> 
> -----Original Message-----
> From: RATS <rats-bounces@ietf.org> On Behalf Of Eric Voit (evoit)
> Sent: Wednesday, June 24, 2020 9:41 AM
> To: rats@ietf.org
> Cc: Wei Pan <william.panwei@huawei.com>; Birkholz, Henk <henk.birkholz@sit.fraunhofer.de>
> Subject: [Rats] draft-birkholz-rats-network-device-subscription-00
> 
> Hi All,
> 
> This draft defines how to subscribe to a stream of attestation related Evidence on TPM-based network devices.  When subscribed, a Telemetry stream of verifiably fresh YANG notifications (which are generated when TPM PCRs are
> extended) are pushed to the subscriber.
> 
> This draft integrates:
>   *  Section 5 of draft-voit-rats-trusted-path-routing-01
>   *  Elements of draft-xia-rats-pubsub-model
> 
> Thanks!
> 
> Eric, Henk, and Wei
> 
> 
> -----Original Message-----
> From: internet-drafts@ietf.org <internet-drafts@ietf.org>
> Sent: Wednesday, June 24, 2020 12:19 PM
> To: Eric Voit (evoit) <evoit@cisco.com>; Wei Pan <william.panwei@huawei.com>; Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
> Subject: New Version Notification for
> draft-birkholz-rats-network-device-subscription-00.txt
> 
> 
> A new version of I-D, draft-birkholz-rats-network-device-subscription-00.txt
> has been successfully submitted by Eric Voit and posted to the IETF repository.
> 
> Name:		draft-birkholz-rats-network-device-subscription
> Revision:	00
> Title:		Attestation Event Stream Subscription
> Document date:	2020-06-24
> Group:		Individual Submission
> Pages:		20
> URL:
> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Finternet-drafts%2Fdraft-birkholz-rats-network-device-subscription-00.txt&amp;data=02%7C01%7Cdthaler%40microsoft.com%7C25825e2a3783449230a708d8185d77f6%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637286137029115135&amp;sdata=MnEJ5ZwAh4BlTNs09fk0Vr1H39j5N%2BJdyBQHNJp7BdY%3D&amp;reserved=0
> Status:
> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-birkholz-rats-network-device-subscription%2F&amp;data=02%7C01%7Cdthaler%40microsoft.com%7C25825e2a3783449230a708d8185d77f6%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637286137029115135&amp;sdata=qukLQaq17P4ts20nW1L%2B2dB9zIM9XB9SRcscFWcOeLw%3D&amp;reserved=0
> Htmlized:
> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-birkholz-rats-network-device-subscription-00&amp;data=02%7C01%7Cdthaler%40microsoft.com%7C25825e2a3783449230a708d8185d77f6%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637286137029125095&amp;sdata=Q0TfFjrfHZU%2FKFOT3li4JG0QoBa3Vo%2FkHTp00T6GbZY%3D&amp;reserved=0
> Htmlized:
> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-birkholz-rats-network-device-subscription&amp;data=02%7C01%7Cdthaler%40microsoft.com%7C25825e2a3783449230a708d8185d77f6%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637286137029125095&amp;sdata=RLSvdRTcWX4Gew50X2DL7t2pE7N%2FA%2BKWrAVz0NhsbiA%3D&amp;reserved=0
> 
> 
> Abstract:
>     This document defines how to subscribe to a stream of attestation
>     related Evidence on TPM-based network devices.
> 
> 
> 
> 
> Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org.
> 
> The IETF Secretariat
> 
> 


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From: "Smith, Ned" <ned.smith@intel.com>
To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, Dave Thaler <dthaler@microsoft.com>, "Eric Voit (evoit)" <evoit=40cisco.com@dmarc.ietf.org>, "rats@ietf.org" <rats@ietf.org>
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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: "Panwei (William)" <william.panwei@huawei.com>
CC: "rats@ietf.org" <rats@ietf.org>
Thread-Topic: Charra: certificate-name vs TPM-name
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Subject: [Rats] Charra: certificate-name vs TPM-name
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Hi Wei Pan,

 

During the RATS WG call you wondered why certificate-name should be used
rather than tpm-name.  There are two reasons:

 

(1) In RFC places like:

 

      +---x tpm20-challenge-response-attestation {TPM20}?

         +--ro output

            +--ro tpm20-attestation-response* []

               +--ro certificate-name?           string

               +--ro quote?                              binary

               +--ro quote-signature              binary

 

if just the tpm-name is provided, how does a Verifier know when a re-keying
happens?    With the current solution, when unknown certificate-name comes
back from the RPC, you just need to query:

 

    +--rw rats-support-structures

       +--rw tpms* [tpm-name]

          +--rw tpm-name                     string

          +--rw certificates

             +--rw certificate* [certificate-name]

                +--rw certificate-name    string

                +--rw certificate-ref?    leafref

                +--rw certificate-type?   enumeration

 

and then you can find the tpm-name, plus all the required info
post-certificate upgrade in one place.  If the certificate-name is not in
the RPC, a Verifier will have to make several guesses on what any failure of
signature verification might mean.

 

(2) The most common implementations will have just one TPM per
router/switch.  These implementations might never care about the tpm-name.
They will care about the certificate used on that router/switch.

 

Thanks,

Eric

 

Eric Voit 

.:|:.:|:. Cisco Systems, Inc.

 


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US =
link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>Hi Wei Pan,<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>During the =
RATS WG call you wondered why certificate-name should be used rather =
than tpm-name.&nbsp; There are two reasons:<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>(1) In RFC =
places like:<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +---x =
tpm20-challenge-response-attestation {TPM20}?<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;+--ro =
output<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;+--ro tpm20-attestation-response* =
[]<o:p></o:p></span></p><p =
class=3DMsoNormal>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;+--ro =
certificate-name?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; string<o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +--ro =
quote?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;binary<o:p></o:p></span><=
/p><p class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;+--ro =
quote-signature&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;binary<o:p></o:p></span><=
/p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>if =
just the tpm-name is provided, how does a Verifier know when a re-keying =
happens?&nbsp;&nbsp;&nbsp; With the current solution, when unknown =
certificate-name comes back from the RPC, you just need to =
query:<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp;&nbsp;&nbsp; +--rw =
rats-support-structures<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +--rw =
tpms* [tpm-name]<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; +--rw =
tpm-name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
string<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; +--rw certificates<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#8FAADC;mso-style-textfill-fill-color:#8FAADC;mso-style-te=
xtfill-fill-alpha:100.0%'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; +--rw certificate* =
[certificate-name]<o:p></o:p></span></p><p =
class=3DMsoNormal>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +--rw =
certificate-name&nbsp;&nbsp;&nbsp; string<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +--rw =
certificate-ref?&nbsp;&nbsp;&nbsp; leafref<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +--rw certificate-type?&nbsp;&nbsp; =
enumeration<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>and then you can find the tpm-name, plus all the =
required info post-certificate upgrade in one place.&nbsp; If the =
certificate-name is not in the RPC, a Verifier will have to make several =
guesses on what any failure of signature verification might =
mean.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>(2) The most common implementations will have just one =
TPM per router/switch.&nbsp; These implementations might never care =
about the tpm-name.&nbsp; They will care about the certificate used on =
that router/switch.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Thanks,<o:p></o:p></p><p =
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class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Eric Voit =
<o:p></o:p></p><p class=3DMsoNormal><b><span lang=3DEN-GB =
style=3D'font-size:10.0pt;color:black'>.:|:.:|:.&nbsp;</span></b><span =
style=3D'font-size:9.0pt'>Cisco Systems, Inc.<o:p></o:p></span></p><p =
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From: Ira McDonald <blueroofmusic@gmail.com>
Date: Tue, 28 Jul 2020 11:47:51 -0400
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To: rats@ietf.org, Ira McDonald <blueroofmusic@gmail.com>
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Subject: [Rats] Durable link to approved TCG Algorithm Registry
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Hi,

Here's the link to that registry, for use in naming algorithms in various
RATS specs:

https://trustedcomputinggroup.org/resource/tcg-algorithm-registry/

I'm encouraging our TCG IT support team to put an obvious durable
link in the TPM WG home page.

Cheers,
- Ira


*Ira McDonald (Musician / Software Architect)Co-Chair - TCG Trusted
Mobility Solutions WG*

*Co-Chair - TCG Metadata Access Protocol SG*








*Chair - Linux Foundation Open Printing WGSecretary - IEEE-ISTO Printer
Working GroupCo-Chair - IEEE-ISTO PWG Internet Printing Protocol WGIETF
Designated Expert - IPP & Printer MIBBlue Roof Music / High North
Inchttp://sites.google.com/site/blueroofmusic
<http://sites.google.com/site/blueroofmusic>http://sites.google.com/site/highnorthinc
<http://sites.google.com/site/highnorthinc>mailto: blueroofmusic@gmail.com
<blueroofmusic@gmail.com>(permanent) PO Box 221  Grand Marais, MI 49839
906-494-2434*

--00000000000049604905ab825d27
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<div dir=3D"ltr"><div>Hi,</div><div><br></div><div>Here&#39;s the link to t=
hat registry, for use in naming algorithms in various</div><div>RATS specs:=
</div><div><br></div><div><a href=3D"https://trustedcomputinggroup.org/reso=
urce/tcg-algorithm-registry/">https://trustedcomputinggroup.org/resource/tc=
g-algorithm-registry/</a></div><div><br></div><div>I&#39;m encouraging our =
TCG IT support team to put an obvious durable</div><div>link in the TPM WG =
home page.</div><div><br></div><div>Cheers,</div><div>- Ira</div><div><br><=
/div><div><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D=
"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"l=
tr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div>=
<div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><i><font size=
=3D"1">Ira McDonald (Musician / Software Architect)<br>Co-Chair - TCG Trust=
ed Mobility Solutions WG</font></i></div><div><i><font size=3D"1">Co-Chair =
- TCG Metadata Access Protocol SG<br></font></i></div><div dir=3D"ltr"><i><=
font size=3D"1">Chair - Linux Foundation Open Printing WG<br>Secretary - IE=
EE-ISTO Printer Working Group<br>Co-Chair - IEEE-ISTO PWG Internet Printing=
 Protocol WG<br>IETF Designated Expert - IPP &amp; Printer MIB<br>Blue Roof=
 Music / High North Inc<br><a style=3D"color:rgb(51,51,255)" href=3D"http:/=
/sites.google.com/site/blueroofmusic" target=3D"_blank">http://sites.google=
.com/site/blueroofmusic</a><br><a style=3D"color:rgb(102,0,204)" href=3D"ht=
tp://sites.google.com/site/highnorthinc" target=3D"_blank">http://sites.goo=
gle.com/site/highnorthinc</a><br>mailto: <a href=3D"mailto:blueroofmusic@gm=
ail.com" target=3D"_blank">blueroofmusic@gmail.com</a><br>(permanent) PO Bo=
x 221=C2=A0 Grand Marais, MI 49839=C2=A0 906-494-2434</font></i></div></div=
></div></div></div></div></div></div></div></div></div></div></div></div></=
div></div></div></div></div></div></div>

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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: Dave Thaler <dthaler=40microsoft.com@dmarc.ietf.org>, "Eric Voit (evoit)" <evoit=40cisco.com@dmarc.ietf.org>, "rats@ietf.org" <rats@ietf.org>
CC: Wei Pan <william.panwei@huawei.com>, "Birkholz, Henk" <henk.birkholz@sit.fraunhofer.de>
Thread-Topic: draft-birkholz-rats-network-device-subscription-00
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Date: Tue, 28 Jul 2020 16:20:34 +0000
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Subject: Re: [Rats] draft-birkholz-rats-network-device-subscription-00
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> Dave Thaler, July 28, 2020 10:10 AM
> 
> I asked in the meeting how a subscriber knows who to subscribe to, and I
> believe the answer was that CHARRA answers that.  

The answer I gave was that the problem was the same as Charra.  I believe I
also said the problem itself is generic to any YANG based network element (I
don't remember if that came out).  Generalizing more from there, Network
Operators have diverse set embedded management systems which include
discovery, addressability, inventory, etc. of the network devices they
manage.

Moving back to YANG, these network management systems don't include all YANG
info about a device.  So once you have found that a device exists, the
device capabilities it supports can be acquired via a variety of mechanisms
like: 
 - NETCONF RFC 6241, Section 7 (and RFC6470)
 - YANG Library RFC 8525

> Well I looked in draft-
> ietf-rats-yang-tpm-charra-02 and it does not contain any mention of the
> subject.  I think one or the other of the two drafts needs to address this
> issue.  

This topic has not been within the scope of the many other YANG drafts/RFC
which exist.   This is reasonable as there is a huge breadth of topology
discovery protocols available and in-use for routers and switches.

Eric

> My preference is that it be in draft-birkholz-rats-network-device-
> subscription since that's the draft that talks about limitations like
> > Evidence is not streamed to an interested Verifier as soon as it is
> generated.
> Which certainly still applies, it's just another case... you didn't know
to
> subscribe to it until after the evidence was generated when it booted.
> 
> Dave
> 
> -----Original Message-----
> From: RATS <rats-bounces@ietf.org> On Behalf Of Eric Voit (evoit)
> Sent: Wednesday, June 24, 2020 9:41 AM
> To: rats@ietf.org
> Cc: Wei Pan <william.panwei@huawei.com>; Birkholz, Henk
> <henk.birkholz@sit.fraunhofer.de>
> Subject: [Rats] draft-birkholz-rats-network-device-subscription-00
> 
> Hi All,
> 
> This draft defines how to subscribe to a stream of attestation related
> Evidence on TPM-based network devices.  When subscribed, a Telemetry
> stream of verifiably fresh YANG notifications (which are generated when
> TPM PCRs are
> extended) are pushed to the subscriber.
> 
> This draft integrates:
>  *  Section 5 of draft-voit-rats-trusted-path-routing-01
>  *  Elements of draft-xia-rats-pubsub-model
> 
> Thanks!
> 
> Eric, Henk, and Wei
> 
> 
> -----Original Message-----
> From: internet-drafts@ietf.org <internet-drafts@ietf.org>
> Sent: Wednesday, June 24, 2020 12:19 PM
> To: Eric Voit (evoit) <evoit@cisco.com>; Wei Pan
> <william.panwei@huawei.com>; Henk Birkholz
> <henk.birkholz@sit.fraunhofer.de>
> Subject: New Version Notification for
> draft-birkholz-rats-network-device-subscription-00.txt
> 
> 
> A new version of I-D,
draft-birkholz-rats-network-device-subscription-00.txt
> has been successfully submitted by Eric Voit and posted to the IETF
> repository.
> 
> Name:		draft-birkholz-rats-network-device-subscription
> Revision:	00
> Title:		Attestation Event Stream Subscription
> Document date:	2020-06-24
> Group:		Individual Submission
> Pages:		20
> URL:
> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.
> ietf.org%2Finternet-drafts%2Fdraft-birkholz-rats-network-device-
> subscription-
> 00.txt&amp;data=02%7C01%7Cdthaler%40microsoft.com%7C25825e2a37834
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> racker.ietf.org%2Fdoc%2Fdraft-birkholz-rats-network-device-
> subscription%2F&amp;data=02%7C01%7Cdthaler%40microsoft.com%7C2582
> 5e2a3783449230a708d8185d77f6%7C72f988bf86f141af91ab2d7cd011db47%7
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> ietf.org%2Fhtml%2Fdraft-birkholz-rats-network-device-subscription-
> 00&amp;data=02%7C01%7Cdthaler%40microsoft.com%7C25825e2a37834492
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> Htmlized:
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> subscription&amp;data=02%7C01%7Cdthaler%40microsoft.com%7C25825e2a
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> 
> 
> Abstract:
>    This document defines how to subscribe to a stream of attestation
>    related Evidence on TPM-based network devices.
> 
> 
> 
> 
> Please note that it may take a couple of minutes from the time of
> submission until the htmlized version and diff are available at
tools.ietf.org.
> 
> The IETF Secretariat
> 
> 
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats

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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/428SI7fpPMvI2uZjJa39uoWTyt8>
Subject: [Rats] RATS interaction model
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I'm fine with Option 2, making the interaction model a single, separate
document, including all the known models.

/guy

 


Juniper Business Use Only


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class=3DMsoNormal>I&#8217;m fine with Option 2, making the interaction =
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To: Ira McDonald <blueroofmusic@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/bbJkZOlWncppv-nTxbbYB9bwn3w>
Subject: Re: [Rats] Durable link to approved TCG Algorithm Registry
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This would just be for TPM-specific RATS stuff. For protocols like CWT =
and EAT, the registry is the standard IANA COSE registry =
<https://www.iana.org/assignments/cose/cose.xhtml>.

LL


> On Jul 28, 2020, at 8:47 AM, Ira McDonald <blueroofmusic@gmail.com> =
wrote:
>=20
> Hi,
>=20
> Here's the link to that registry, for use in naming algorithms in =
various
> RATS specs:
>=20
> https://trustedcomputinggroup.org/resource/tcg-algorithm-registry/ =
<https://trustedcomputinggroup.org/resource/tcg-algorithm-registry/>
>=20
> I'm encouraging our TCG IT support team to put an obvious durable
> link in the TPM WG home page.
>=20
> Cheers,
> - Ira
>=20
> Ira McDonald (Musician / Software Architect)
> Co-Chair - TCG Trusted Mobility Solutions WG
> Co-Chair - TCG Metadata Access Protocol SG
> Chair - Linux Foundation Open Printing WG
> Secretary - IEEE-ISTO Printer Working Group
> Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
> IETF Designated Expert - IPP & Printer MIB
> Blue Roof Music / High North Inc
> http://sites.google..com/site/blueroofmusic =
<http://sites.google.com/site/blueroofmusic>
> http://sites.google.com/site/highnorthinc =
<http://sites.google.com/site/highnorthinc>
> mailto: blueroofmusic@gmail.com <mailto:blueroofmusic@gmail.com>
> (permanent) PO Box 221  Grand Marais, MI 49839  906-494-2434
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">This =
would just be for TPM-specific RATS stuff. For protocols like CWT and =
EAT, the registry is the standard&nbsp;<a =
href=3D"https://www.iana.org/assignments/cose/cose.xhtml" class=3D"">IANA =
COSE registry</a>.<div class=3D""><br class=3D""></div><div =
class=3D"">LL</div><div class=3D""><br class=3D""><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On Jul =
28, 2020, at 8:47 AM, Ira McDonald &lt;<a =
href=3D"mailto:blueroofmusic@gmail.com" =
class=3D"">blueroofmusic@gmail.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D""><div class=3D"">Hi,</div><div class=3D""><br =
class=3D""></div><div class=3D"">Here's the link to that registry, for =
use in naming algorithms in various</div><div class=3D"">RATS =
specs:</div><div class=3D""><br class=3D""></div><div class=3D""><a =
href=3D"https://trustedcomputinggroup.org/resource/tcg-algorithm-registry/=
" =
class=3D"">https://trustedcomputinggroup.org/resource/tcg-algorithm-regist=
ry/</a></div><div class=3D""><br class=3D""></div><div class=3D"">I'm =
encouraging our TCG IT support team to put an obvious durable</div><div =
class=3D"">link in the TPM WG home page.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Cheers,</div><div class=3D"">- =
Ira</div><div class=3D""><br class=3D""></div><div class=3D""><div =
class=3D""><div dir=3D"ltr" class=3D"gmail_signature" =
data-smartmail=3D"gmail_signature"><div dir=3D"ltr" class=3D""><div =
class=3D""><div dir=3D"ltr" class=3D""><div class=3D""><div dir=3D"ltr" =
class=3D""><div class=3D""><div dir=3D"ltr" class=3D""><div =
class=3D""><div dir=3D"ltr" class=3D""><div class=3D""><div dir=3D"ltr" =
class=3D""><div class=3D""><div dir=3D"ltr" class=3D""><div =
class=3D""><div dir=3D"ltr" class=3D""><div class=3D""><div dir=3D"ltr" =
class=3D""><i class=3D""><font size=3D"1" class=3D"">Ira McDonald =
(Musician / Software Architect)<br class=3D"">Co-Chair - TCG Trusted =
Mobility Solutions WG</font></i></div><div class=3D""><i class=3D""><font =
size=3D"1" class=3D"">Co-Chair - TCG Metadata Access Protocol SG<br =
class=3D""></font></i></div><div dir=3D"ltr" class=3D""><i =
class=3D""><font size=3D"1" class=3D"">Chair - Linux Foundation Open =
Printing WG<br class=3D"">Secretary - IEEE-ISTO Printer Working Group<br =
class=3D"">Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG<br =
class=3D"">IETF Designated Expert - IPP &amp; Printer MIB<br =
class=3D"">Blue Roof Music / High North Inc<br class=3D""><a =
style=3D"color:rgb(51,51,255)" =
href=3D"http://sites.google.com/site/blueroofmusic" target=3D"_blank" =
class=3D"">http://sites.google..com/site/blueroofmusic</a><br =
class=3D""><a style=3D"color:rgb(102,0,204)" =
href=3D"http://sites.google.com/site/highnorthinc" target=3D"_blank" =
class=3D"">http://sites.google.com/site/highnorthinc</a><br =
class=3D"">mailto: <a href=3D"mailto:blueroofmusic@gmail.com" =
target=3D"_blank" class=3D"">blueroofmusic@gmail.com</a><br =
class=3D"">(permanent) PO Box 221&nbsp; Grand Marais, MI 49839&nbsp; =
906-494-2434</font></i></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
>
_______________________________________________<br class=3D"">RATS =
mailing list<br class=3D""><a href=3D"mailto:RATS@ietf.org" =
class=3D"">RATS@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/rats<br =
class=3D""></div></blockquote></div><br class=3D""></div></body></html>=

--Apple-Mail=_14FCF7BD-15E3-46FE-BC5C-1452BAE3BEE5--


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To: Laurence Lundblade <lgl@island-resort.com>, Ira McDonald <blueroofmusic@gmail.com>
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References: <CAN40gSt8SKX11wb4scdXfZzKufK1G+9pJJhfOJdqP9L00fo+Cw@mail.gmail.com> <0D24E46C-9F6F-433A-8636-372CEE7E3B91@island-resort.com>
From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Rats] Durable link to approved TCG Algorithm Registry
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Hi Laurence,

I think that was a reference in support of the "YANG module algorithm 
identity" discussion in the meeting on Tuesday.

COSE of course uses the COSE registries.

YANG does not use COSE though. And quite some time was spend on trying 
to find out which registries to use here (in RATS) in the end. As we 
learn from NETCONF, using crypto algorithm (registries) in a convenient 
and universal manner can be very very hard.

Viele Grüße,

Henk

On 29.07.20 02:41, Laurence Lundblade wrote:
> This would just be for TPM-specific RATS stuff. For protocols like CWT 
> and EAT, the registry is the standard IANA COSE registry 
> <https://www.iana.org/assignments/cose/cose.xhtml>.
> 
> LL
> 
> 
>> On Jul 28, 2020, at 8:47 AM, Ira McDonald <blueroofmusic@gmail.com 
>> <mailto:blueroofmusic@gmail.com>> wrote:
>>
>> Hi,
>>
>> Here's the link to that registry, for use in naming algorithms in various
>> RATS specs:
>>
>> https://trustedcomputinggroup.org/resource/tcg-algorithm-registry/
>>
>> I'm encouraging our TCG IT support team to put an obvious durable
>> link in the TPM WG home page.
>>
>> Cheers,
>> - Ira
>>
>> /Ira McDonald (Musician / Software Architect)
>> Co-Chair - TCG Trusted Mobility Solutions WG/
>> /Co-Chair - TCG Metadata Access Protocol SG
>> /
>> /Chair - Linux Foundation Open Printing WG
>> Secretary - IEEE-ISTO Printer Working Group
>> Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
>> IETF Designated Expert - IPP & Printer MIB
>> Blue Roof Music / High North Inc
>> http://sites.google..com/site/blueroofmusic 
>> <http://sites.google.com/site/blueroofmusic>
>> http://sites.google.com/site/highnorthinc
>> mailto: blueroofmusic@gmail.com <mailto:blueroofmusic@gmail.com>
>> (permanent) PO Box 221  Grand Marais, MI 49839  906-494-2434/
>> _______________________________________________
>> RATS mailing list
>> RATS@ietf.org <mailto:RATS@ietf.org>
>> https://www.ietf.org/mailman/listinfo/rats
> 
> 
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
> 


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Subject: [Rats] Age Claim  in EAT
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Hi Laurence, Hi all,

How does the age claim work?

The spec says "represents the number of seconds that have elapsed since the=
 token was created".

By creating a token you also protect the claims with a signature and hence =
you cannot change the content of the claims anymore (without breaking the s=
ignature).

Hence, here "creating a token" must mean something different. I suspect it =
means when certain values have been collected from the device and before th=
e token with the signature was put together. Correct?

If that's the case, I wonder whether it would also make sense to take into =
account that different information may be collected at a different point in=
 time and hence the age indication would better go (somehow) with specific =
claims where the time difference between the collection of the data and the=
 signature generation matters. I also wonder whether the number of seconds =
matter and whether you really want to communicate something more abstract, =
such as "I created a hash over the firmware during boot time" rather than "=
I created the hash over the firmware in real-time when I was asked".

Ciao
Hannes

IMPORTANT NOTICE: The contents of this email and any attachments are confid=
ential and may also be privileged. If you are not the intended recipient, p=
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any medium. Thank you.


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Hi Hannes,

in the scope of Evidence:

Signing a CWT structure is creating an EAT. This event is defined as 
time(EG) here: 
https://tools.ietf.org/html/draft-ietf-rats-architecture-05#appendix-A

"Creating a token" would mean "Evidence Generation", for example.

Age also is a time interval based on a time unit (units that apply to 
Henk are years, I claim that Henk's age is 21, of course. Trust in 
Henk's Claims can be established via Endorsements). Age is a time 
interval expressed as a duration. That means that the beginning of that 
time interval is set as zero (an epoch) and then counts the time units.

The semantics of age in EAT are:

the epoch is time(EG) and the unit is seconds.
This only works, if time sources for relative time-counters are 
available, of course.

Collection of Claims - time(CC) was proposed to the architecture, but 
did not find consensus yet (we are working on time(AA), though, the time 
at which the Attester becomes aware of a changes value in the Target 
Environment right now).

But! there is time(VG), the Value Generation. This time can often only 
be inferred or approximated (in contrast to time(AA)), but it is the 
best we have defined right now in the context of:

> If that's the case, I wonder whether it would also make sense to take into account that different information may be collected at a different point in time and hence the age indication would better go (somehow) with specific claims where the time difference between the collection of the data and the signature generation matters.

As a note: We have not talked at all before about the common concept of 
"latches" or stage transitions... this is an important concept that does 
capture the "this event has happened" (before/after a defined event) and 
represents strong security implications that are not included in the 
RATS architecture today. Would that maybe help in your context?

Viele Grüße,

Henk


On 29.07.20 10:37, Hannes Tschofenig wrote:
> Hi Laurence, Hi all,
> 
> How does the age claim work?
> 
> The spec says "represents the number of seconds that have elapsed since the token was created".
> 
> By creating a token you also protect the claims with a signature and hence you cannot change the content of the claims anymore (without breaking the signature).
> 
> Hence, here "creating a token" must mean something different. I suspect it means when certain values have been collected from the device and before the token with the signature was put together. Correct?
> 
> If that's the case, I wonder whether it would also make sense to take into account that different information may be collected at a different point in time and hence the age indication would better go (somehow) with specific claims where the time difference between the collection of the data and the signature generation matters. I also wonder whether the number of seconds matter and whether you really want to communicate something more abstract, such as "I created a hash over the firmware during boot time" rather than "I created the hash over the firmware in real-time when I was asked".
> 
> Ciao
> Hannes
> 
> IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
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From: Laurence Lundblade <lgl@island-resort.com>
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Subject: [Rats] Attestation key material in architecture document
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I presented this slide below the IETF 108 RATS meeting today. I believe =
it is critical that the RATS architecture allow for all uses case in the =
slide.=20

In particular RATS architecture must allow for symmetric keys. TPMs and =
public-key based crypto is too expensive for low-cost, large-scale IoT. =
There are real use cases supported my multiple companies using symmetric =
keys. Symmetric keys can be made secure at the verifier =E2=80=94 we =
secure keys for TLS at servers all the time using HSMs and such.

I do NOT want to put this taxonomy into the RATS architecture document. =
I don=E2=80=99t think that is necessary. I created the taxonomy as =
background information and as illustrative examples of real world =
designs.=20

I think there are options for adjusting the architecture document to =
accommodate this.

Option 1) Expand the notion of an Endorsement quite a lot. Endorsements =
are not longer just static documents like X.509 certs and/or COSE/CMS =
signed blobs. They are anything that conveys the attestation key =
material into the Verifier or allows Verification of the attester. They =
must support confidentiality.

Option 2) Replace the term =E2=80=9CEndorsement=E2=80=9D with something =
like =E2=80=9CVerifier Input=E2=80=9D or =E2=80=9CAttester Trust =
Criteria=E2=80=9D in the architecture document as the means by which key =
material goes into the Verifier. Endorsements still exist, but are just =
one type of Verifier Input or Attester Trust Criteria just like EAT is =
one kind of Attestation Evidence.

I have a slight preference for Option 2). I=E2=80=99m interested in =
opinions of which option to choose.

This is issue #65 =
<https://github.com/ietf-rats-wg/architecture/issues/65>, opened in =
GitHub four months ago. It is not a last-minute/new issue. I believe it =
is in scope with the RATS charter as the charter explicitly mentions =
attestation key material in the Program of Work.

LL

My main point of this taxonomy was to affect the RATS architecture =
document. There was discussion today of it being a separate document =
perhaps outside of RATS. I=E2=80=99m happy for that to happen, but I =
don=E2=80=99t want to write it because I have enough RATS/EAT work to =
do. I=E2=80=99m very happy if other folks want to pick it up and use in =
other documents :-).


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">I =
presented this slide below the IETF 108 RATS meeting today. I believe it =
is critical that the RATS architecture allow for all uses case in the =
slide.&nbsp;<div class=3D""><br class=3D""></div><div class=3D"">In =
particular RATS architecture must allow for symmetric keys. TPMs and =
public-key based crypto is too expensive for low-cost, large-scale IoT. =
There are real use cases supported my multiple companies using symmetric =
keys. Symmetric keys can be made secure at the verifier =E2=80=94 we =
secure keys for TLS at servers all the time using HSMs and =
such.</div><div class=3D""><br class=3D""></div><div class=3D"">I do NOT =
want to put this taxonomy into the RATS architecture document. I don=E2=80=
=99t think that is necessary. I created the taxonomy as background =
information and as illustrative examples of real world =
designs.&nbsp;</div><div class=3D""><br class=3D""></div><div class=3D"">I=
 think there are options for adjusting the architecture document to =
accommodate this.</div><div class=3D""><br class=3D""></div><blockquote =
style=3D"margin: 0 0 0 40px; border: none; padding: 0px;" class=3D""><div =
class=3D"">Option 1) Expand the notion of an Endorsement quite a lot. =
Endorsements are not longer just static documents like X.509 certs =
and/or COSE/CMS signed blobs. They are anything that conveys the =
attestation key material into the Verifier or allows Verification of the =
attester. They must support confidentiality.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Option 2) Replace the term =
=E2=80=9CEndorsement=E2=80=9D with something like =E2=80=9CVerifier =
Input=E2=80=9D or =E2=80=9CAttester Trust Criteria=E2=80=9D in the =
architecture document as the means by which key material goes into the =
Verifier. Endorsements still exist, but are just one type of Verifier =
Input or Attester Trust Criteria just like EAT is one kind of =
Attestation Evidence.</div></blockquote><div class=3D""><br =
class=3D""></div><div class=3D"">I have a slight preference for Option =
2). I=E2=80=99m interested in opinions of which option to choose.<br =
class=3D""><div class=3D""><br class=3D""></div><div class=3D"">This =
is&nbsp;<a href=3D"https://github.com/ietf-rats-wg/architecture/issues/65"=
 class=3D"">issue #65</a>,&nbsp;opened in GitHub four months ago. It is =
not a last-minute/new issue. I believe it is in scope with the RATS =
charter as the charter explicitly mentions attestation key material in =
the Program of Work.</div><div class=3D""><br class=3D""></div><div =
class=3D"">LL<br class=3D""><div class=3D""><br class=3D""></div><div =
class=3D"">My main point of this taxonomy was to affect the RATS =
architecture document. There was discussion today of it being a separate =
document perhaps outside of RATS. I=E2=80=99m happy for that to happen, =
but I don=E2=80=99t want to write it because I have enough RATS/EAT work =
to do. I=E2=80=99m very happy if other folks want to pick it up and use =
in other documents :-).</div><div class=3D""><br class=3D""></div><div =
class=3D""><img apple-inline=3D"yes" =
id=3D"0CCBF5F3-FBAF-435C-958F-9869966834D6" =
src=3D"cid:3FB5CFD2-B918-4A2C-8B47-E737139DC3BE" =
class=3D""></div></div></div></body></html>=

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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, "rats@ietf.org" <rats@ietf.org>
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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/byeuNDhCKTHrYvdVDVJW1ZQHLOc>
Subject: [Rats] Location Claim
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Dear EAT draft authors,

I believe the location claim defined in the EAT spec can benefit from furth=
er clarification.

I think you want to focus on systems that obtain location information via a=
 GPS receiver. Is this correct?

>From the short text I understand that you want to support a 2d point, a 3d =
point, a circle (i.e. the point with a radius) and a sphere (the 3d version=
 of the circle).
(More about location shapes can be found in RFC 5491.)

If you also want to express uncertainty and confidence then you may want to=
 look at RFC 7459.

You are also interested to express dynamic location. You might want to look=
 at RFC 5962 and add orientation too. Dynamic location is obviously pretty =
tricky in the context of an attestation based mechanism because dynamic loc=
ation, as the name indicates, changes frequently. In location-based systems=
 there is often the desire to express some time series data or average the =
measured data over a certain timeframe.

I would recommend using the terms from the above-mentioned RFCs when it com=
es to location because they have been again re-used from the OGC, the Open =
Geospatial Consortium.
This would produce something like:


  *   2d Point: Lat/long
  *   3d Point: lat/long/alt
  *   Circle: lat/long/radius
  *   Sphere: lat/long/alt/radius
  *   For dynamic location add speed, orientation, and heading to the above=
 shapes.

Ciao
Hannes

IMPORTANT NOTICE: The contents of this email and any attachments are confid=
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<p class=3D"MsoNormal">Dear EAT draft authors, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I believe the location claim defined in the EAT spec=
 can benefit from further clarification.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I think you want to focus on systems that obtain loc=
ation information via a GPS receiver. Is this correct?
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">From the short text I understand that you want to su=
pport a 2d point, a 3d point, a circle (i.e. the point with a radius) and a=
 sphere (the 3d version of the circle).
<o:p></o:p></p>
<p class=3D"MsoNormal">(More about location shapes can be found in RFC 5491=
.)<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">If you also want to express uncertainty and confiden=
ce then you may want to look at RFC 7459.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">You are also interested to express dynamic location.=
 You might want to look at RFC 5962 and add orientation too. Dynamic locati=
on is obviously pretty tricky in the context of an attestation based mechan=
ism because dynamic location, as the
 name indicates, changes frequently. In location-based systems there is oft=
en the desire to express some time series data or average the measured data=
 over a certain timeframe.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I would recommend using the terms from the above-men=
tioned RFCs when it comes to location because they have been again re-used =
from the OGC, the Open
<span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif;co=
lor:#3C4043;background:white">
Geospatial&nbsp;</span>Consortium. <o:p></o:p></p>
<p class=3D"MsoNormal">This would produce something like: <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo1">2d Point: Lat/long<o:p></o:p></li><li class=3D"MsoListParagraph" styl=
e=3D"margin-left:0in;mso-list:l0 level1 lfo1">3d Point: lat/long/alt<o:p></=
o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l=
0 level1 lfo1">Circle: lat/long/radius<o:p></o:p></li><li class=3D"MsoListP=
aragraph" style=3D"margin-left:0in;mso-list:l0 level1 lfo1">Sphere: lat/lon=
g/alt/radius
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso=
-list:l0 level1 lfo1">For dynamic location add speed, orientation, and head=
ing to the above shapes.
<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Ciao<o:p></o:p></p>
<p class=3D"MsoNormal">Hannes<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
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</body>
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From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Rats] Location Claim
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Hi all,

in general, you might also want to have a look at "The GeoJSON Format" 
(RFC7946) that is based on this work:

> https://geojson.org/geojson-spec

Viele Grüße,

Henk


On 30.07.20 11:00, Hannes Tschofenig wrote:
> Dear EAT draft authors,
> 
> I believe the location claim defined in the EAT spec can benefit from 
> further clarification.
> 
> I think you want to focus on systems that obtain location information 
> via a GPS receiver. Is this correct?
> 
>  From the short text I understand that you want to support a 2d point, a 
> 3d point, a circle (i.e. the point with a radius) and a sphere (the 3d 
> version of the circle).
> 
> (More about location shapes can be found in RFC 5491..)
> 
> If you also want to express uncertainty and confidence then you may want 
> to look at RFC 7459.
> 
> You are also interested to express dynamic location. You might want to 
> look at RFC 5962 and add orientation too. Dynamic location is obviously 
> pretty tricky in the context of an attestation based mechanism because 
> dynamic location, as the name indicates, changes frequently. In 
> location-based systems there is often the desire to express some time 
> series data or average the measured data over a certain timeframe.
> 
> I would recommend using the terms from the above-mentioned RFCs when it 
> comes to location because they have been again re-used from the OGC, the 
> Open Geospatial Consortium.
> 
> This would produce something like:
> 
>   * 2d Point: Lat/long
>   * 3d Point: lat/long/alt
>   * Circle: lat/long/radius
>   * Sphere: lat/long/alt/radius
>   * For dynamic location add speed, orientation, and heading to the
>     above shapes. 
> 
> Ciao
> 
> Hannes
> 
> IMPORTANT NOTICE: The contents of this email and any attachments are 
> confidential and may also be privileged. If you are not the intended 
> recipient, please notify the sender immediately and do not disclose the 
> contents to any other person, use it for any purpose, or store or copy 
> the information in any medium. Thank you.
> 
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
> 


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From: "Oliver, Ian (Nokia - FI/Espoo)" <ian.oliver@nokia-bell-labs.com>
To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] Age Claim in EAT
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Subject: Re: [Rats] Age Claim in EAT
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Interesting.

We've implemented something similar (or at least tried to be compliant with=
 the spec as much as we can)

For each claim we have at minimum the time of the claim request (R) by the =
attestating authority, the time of claim creation (C) by the reporting auth=
ority and the time of receipt (T) by the attesting authority.

One of the attestation rules is thus: R < C < T

Another would then deal with timliness of the obtaining of the claim, eg:  =
 T -R < \epsilon

I agree that some idea of the latches/stage-transitions would help.

Ian


--

Dr. Ian Oliver

Cybersecurity Research

Distinguished Member of Technical Staff

Nokia Bell Labs

+358 50 483 6237

________________________________
From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
Sent: 30 July 2020 11:28
To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>; rats@ietf.org <rats@ie=
tf.org>
Subject: Re: [Rats] Age Claim in EAT

Thanks for the clarification, Henk.

Since I don't know what information consumers of Entity Attestation Tokens =
really need to make decisions I am not sure whether the current functionali=
ty is sufficient already or not. To me as a reader it appears underspecifie=
d.  At a minimum a reference to Appendix A of the RATS architecture documen=
t in the EAT spec would be useful.

Ciao
Hannes

-----Original Message-----
From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
Sent: Wednesday, July 29, 2020 11:11 AM
To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>; rats@ietf.org
Subject: Re: [Rats] Age Claim in EAT

Hi Hannes,

in the scope of Evidence:

Signing a CWT structure is creating an EAT. This event is defined as
time(EG) here:
https://tools.ietf.org/html/draft-ietf-rats-architecture-05#appendix-A

"Creating a token" would mean "Evidence Generation", for example.

Age also is a time interval based on a time unit (units that apply to Henk =
are years, I claim that Henk's age is 21, of course. Trust in Henk's Claims=
 can be established via Endorsements). Age is a time interval expressed as =
a duration. That means that the beginning of that time interval is set as z=
ero (an epoch) and then counts the time units.

The semantics of age in EAT are:

the epoch is time(EG) and the unit is seconds.
This only works, if time sources for relative time-counters are available, =
of course.

Collection of Claims - time(CC) was proposed to the architecture, but did n=
ot find consensus yet (we are working on time(AA), though, the time at whic=
h the Attester becomes aware of a changes value in the Target Environment r=
ight now).

But! there is time(VG), the Value Generation. This time can often only be i=
nferred or approximated (in contrast to time(AA)), but it is the best we ha=
ve defined right now in the context of:

> If that's the case, I wonder whether it would also make sense to take int=
o account that different information may be collected at a different point =
in time and hence the age indication would better go (somehow) with specifi=
c claims where the time difference between the collection of the data and t=
he signature generation matters.

As a note: We have not talked at all before about the common concept of "la=
tches" or stage transitions... this is an important concept that does captu=
re the "this event has happened" (before/after a defined event) and represe=
nts strong security implications that are not included in the RATS architec=
ture today. Would that maybe help in your context?

Viele Gr=FC=DFe,

Henk


On 29.07.20 10:37, Hannes Tschofenig wrote:
> Hi Laurence, Hi all,
>
> How does the age claim work?
>
> The spec says "represents the number of seconds that have elapsed since t=
he token was created".
>
> By creating a token you also protect the claims with a signature and henc=
e you cannot change the content of the claims anymore (without breaking the=
 signature).
>
> Hence, here "creating a token" must mean something different. I suspect i=
t means when certain values have been collected from the device and before =
the token with the signature was put together. Correct?
>
> If that's the case, I wonder whether it would also make sense to take int=
o account that different information may be collected at a different point =
in time and hence the age indication would better go (somehow) with specifi=
c claims where the time difference between the collection of the data and t=
he signature generation matters. I also wonder whether the number of second=
s matter and whether you really want to communicate something more abstract=
, such as "I created a hash over the firmware during boot time" rather than=
 "I created the hash over the firmware in real-time when I was asked".
>
> Ciao
> Hannes
>
> IMPORTANT NOTICE: The contents of this email and any attachments are conf=
idential and may also be privileged. If you are not the intended recipient,=
 please notify the sender immediately and do not disclose the contents to a=
ny other person, use it for any purpose, or store or copy the information i=
n any medium. Thank you.
>
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
>
IMPORTANT NOTICE: The contents of this email and any attachments are confid=
ential and may also be privileged. If you are not the intended recipient, p=
lease notify the sender immediately and do not disclose the contents to any=
 other person, use it for any purpose, or store or copy the information in =
any medium. Thank you.

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Interesting.</div>
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<br>
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<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
We've implemented something similar (or at least tried to be compliant with=
 the spec as much as we can)</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
For each claim we have at minimum the time of the claim request (R) by the =
attestating authority, the time of claim creation (C) by the reporting auth=
ority and the time of receipt (T) by the attesting authority.</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
One of the attestation rules is thus: R &lt; C &lt; T</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Another would then deal with timliness of the obtaining of the claim, eg:&n=
bsp;&nbsp; T -R &lt; \epsilon</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
I agree that some idea of the latches/stage-transitions would help.<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Ian<br>
</div>
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<p style=3D"margin-top: 0px; margin-bottom: 0px;margin-top:0; margin-bottom=
:0">-- <br>
</p>
<p style=3D"margin-top: 0px; margin-bottom: 0px;margin-top:0; margin-bottom=
:0">Dr. Ian Oliver</p>
<p style=3D"margin-top: 0px; margin-bottom: 0px;margin-top:0; margin-bottom=
:0">Cybersecurity Research<br>
</p>
<p style=3D"margin-top: 0px; margin-bottom: 0px;margin-top:0; margin-bottom=
:0">Distinguished Member of Technical Staff</p>
<p style=3D"margin-top: 0px; margin-bottom: 0px;margin-top:0; margin-bottom=
:0">Nokia Bell Labs</p>
<p style=3D"margin-top: 0px; margin-bottom: 0px;margin-top:0; margin-bottom=
:0">+358 50 483 6237<br>
</p>
</div>
</div>
</div>
</div>
<div>
<div id=3D"appendonsend"></div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font style=3D"font-size: 11pt;" data=
-ogsc=3D"" face=3D"Calibri, sans-serif" color=3D"#000000"><b>From:</b> Hann=
es Tschofenig &lt;Hannes.Tschofenig@arm.com&gt;<br>
<b>Sent:</b> 30 July 2020 11:28<br>
<b>To:</b> Henk Birkholz &lt;henk.birkholz@sit.fraunhofer.de&gt;; rats@ietf=
.org &lt;rats@ietf.org&gt;<br>
<b>Subject:</b> Re: [Rats] Age Claim in EAT</font>
<div>&nbsp;</div>
</div>
<div class=3D"BodyFragment"><font size=3D"2"><span style=3D"font-size:11pt"=
>
<div class=3D"PlainText">Thanks for the clarification, Henk.<br>
<br>
Since I don't know what information consumers of Entity Attestation Tokens =
really need to make decisions I am not sure whether the current functionali=
ty is sufficient already or not. To me as a reader it appears underspecifie=
d.&nbsp; At a minimum a reference to
 Appendix A of the RATS architecture document in the EAT spec would be usef=
ul.<br>
<br>
Ciao<br>
Hannes<br>
<br>
-----Original Message-----<br>
From: Henk Birkholz &lt;henk.birkholz@sit.fraunhofer.de&gt;<br>
Sent: Wednesday, July 29, 2020 11:11 AM<br>
To: Hannes Tschofenig &lt;Hannes.Tschofenig@arm.com&gt;; rats@ietf.org<br>
Subject: Re: [Rats] Age Claim in EAT<br>
<br>
Hi Hannes,<br>
<br>
in the scope of Evidence:<br>
<br>
Signing a CWT structure is creating an EAT. This event is defined as<br>
time(EG) here:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-rats-architecture-05#appe=
ndix-A">https://tools.ietf.org/html/draft-ietf-rats-architecture-05#appendi=
x-A</a><br>
<br>
&quot;Creating a token&quot; would mean &quot;Evidence Generation&quot;, fo=
r example.<br>
<br>
Age also is a time interval based on a time unit (units that apply to Henk =
are years, I claim that Henk's age is 21, of course. Trust in Henk's Claims=
 can be established via Endorsements). Age is a time interval expressed as =
a duration. That means that the
 beginning of that time interval is set as zero (an epoch) and then counts =
the time units.<br>
<br>
The semantics of age in EAT are:<br>
<br>
the epoch is time(EG) and the unit is seconds.<br>
This only works, if time sources for relative time-counters are available, =
of course.<br>
<br>
Collection of Claims - time(CC) was proposed to the architecture, but did n=
ot find consensus yet (we are working on time(AA), though, the time at whic=
h the Attester becomes aware of a changes value in the Target Environment r=
ight now).<br>
<br>
But! there is time(VG), the Value Generation. This time can often only be i=
nferred or approximated (in contrast to time(AA)), but it is the best we ha=
ve defined right now in the context of:<br>
<br>
&gt; If that's the case, I wonder whether it would also make sense to take =
into account that different information may be collected at a different poi=
nt in time and hence the age indication would better go (somehow) with spec=
ific claims where the time difference
 between the collection of the data and the signature generation matters.<b=
r>
<br>
As a note: We have not talked at all before about the common concept of &qu=
ot;latches&quot; or stage transitions... this is an important concept that =
does capture the &quot;this event has happened&quot; (before/after a define=
d event) and represents strong security implications
 that are not included in the RATS architecture today. Would that maybe hel=
p in your context?<br>
<br>
Viele Gr=FC=DFe,<br>
<br>
Henk<br>
<br>
<br>
On 29.07.20 10:37, Hannes Tschofenig wrote:<br>
&gt; Hi Laurence, Hi all,<br>
&gt;<br>
&gt; How does the age claim work?<br>
&gt;<br>
&gt; The spec says &quot;represents the number of seconds that have elapsed=
 since the token was created&quot;.<br>
&gt;<br>
&gt; By creating a token you also protect the claims with a signature and h=
ence you cannot change the content of the claims anymore (without breaking =
the signature).<br>
&gt;<br>
&gt; Hence, here &quot;creating a token&quot; must mean something different=
. I suspect it means when certain values have been collected from the devic=
e and before the token with the signature was put together. Correct?<br>
&gt;<br>
&gt; If that's the case, I wonder whether it would also make sense to take =
into account that different information may be collected at a different poi=
nt in time and hence the age indication would better go (somehow) with spec=
ific claims where the time difference
 between the collection of the data and the signature generation matters. I=
 also wonder whether the number of seconds matter and whether you really wa=
nt to communicate something more abstract, such as &quot;I created a hash o=
ver the firmware during boot time&quot; rather
 than &quot;I created the hash over the firmware in real-time when I was as=
ked&quot;.<br>
&gt;<br>
&gt; Ciao<br>
&gt; Hannes<br>
&gt;<br>
&gt; IMPORTANT NOTICE: The contents of this email and any attachments are c=
onfidential and may also be privileged. If you are not the intended recipie=
nt, please notify the sender immediately and do not disclose the contents t=
o any other person, use it for any
 purpose, or store or copy the information in any medium. Thank you.<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; RATS mailing list<br>
&gt; RATS@ietf.org<br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/rats">https://www.iet=
f.org/mailman/listinfo/rats</a><br>
&gt;<br>
IMPORTANT NOTICE: The contents of this email and any attachments are confid=
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lease notify the sender immediately and do not disclose the contents to any=
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Hi Laurence,

I updated issue #65 for you:

> https://github.com/ietf-rats-wg/architecture/issues/65

This will make it easier for the editors to address your two alternative 
proposals. I think it would help, if you are present when we discuss this.

MCR: do we plan for an editor's meeting next Tue?

Viele Grüße,

Henk

On 29.07.20 22:14, Laurence Lundblade wrote:
> I presented this slide below the IETF 108 RATS meeting today. I believe 
> it is critical that the RATS architecture allow for all uses case in the 
> slide.
> 
> In particular RATS architecture must allow for symmetric keys. TPMs and 
> public-key based crypto is too expensive for low-cost, large-scale IoT. 
> There are real use cases supported my multiple companies using symmetric 
> keys. Symmetric keys can be made secure at the verifier — we secure keys 
> for TLS at servers all the time using HSMs and such.
> 
> I do NOT want to put this taxonomy into the RATS architecture document. 
> I don’t think that is necessary. I created the taxonomy as background 
> information and as illustrative examples of real world designs.
> 
> I think there are options for adjusting the architecture document to 
> accommodate this.
> 
>     Option 1) Expand the notion of an Endorsement quite a lot.
>     Endorsements are not longer just static documents like X.509 certs
>     and/or COSE/CMS signed blobs. They are anything that conveys the
>     attestation key material into the Verifier or allows Verification of
>     the attester. They must support confidentiality.
> 
>     Option 2) Replace the term “Endorsement” with something like
>     “Verifier Input” or “Attester Trust Criteria” in the architecture
>     document as the means by which key material goes into the Verifier.
>     Endorsements still exist, but are just one type of Verifier Input or
>     Attester Trust Criteria just like EAT is one kind of Attestation
>     Evidence.
> 
> 
> I have a slight preference for Option 2). I’m interested in opinions of 
> which option to choose.
> 
> This is issue #65 
> <https://github.com/ietf-rats-wg/architecture/issues/65>, opened in 
> GitHub four months ago. It is not a last-minute/new issue. I believe it 
> is in scope with the RATS charter as the charter explicitly mentions 
> attestation key material in the Program of Work.
> 
> LL
> 
> My main point of this taxonomy was to affect the RATS architecture 
> document. There was discussion today of it being a separate document 
> perhaps outside of RATS. I’m happy for that to happen, but I don’t want 
> to write it because I have enough RATS/EAT work to do. I’m very happy if 
> other folks want to pick it up and use in other documents :-).
> 
> 
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats
> 


From nobody Thu Jul 30 11:50:35 2020
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From: Laurence Lundblade <lgl@island-resort.com>
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Date: Thu, 30 Jul 2020 11:50:28 -0700
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Cc: rats@ietf.org
To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
References: <830EC75F-B44E-4F3A-9972-D2196E480DBC@island-resort.com> <8d1ee7d4-bba4-a15c-28da-d3c380d265be@sit.fraunhofer.de>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/5jzBC-A6Dug9M8kgCmD1yQ2C9EQ>
Subject: Re: [Rats] Attestation key material in architecture document
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	charset=utf-8

Thanks for updating the issue. I will attend the architecture meeting =
when it is discussed. :-)

A good first step would be to determine if there is consensus that the 7 =
cases I described (TRUST_ANCHOR=E2=80=A6VERIFICATION_SERVICE) should be =
allowed and supported by RATS. There were no fundamental objections in =
the 108 RATS meeting, but it would be good to know explicitly there is =
consensus on this so we=E2=80=99re working from a common base.

Does anyone think RATS architecture should explicitly exclude any of =
these 7?

LL


> On Jul 30, 2020, at 3:31 AM, Henk Birkholz =
<henk.birkholz@sit.fraunhofer.de> wrote:
>=20
> Hi Laurence,
>=20
> I updated issue #65 for you:
>=20
>> https://github.com/ietf-rats-wg/architecture/issues/65 =
<https://github.com/ietf-rats-wg/architecture/issues/65>
>=20
> This will make it easier for the editors to address your two =
alternative proposals. I think it would help, if you are present when we =
discuss this.
>=20
> MCR: do we plan for an editor's meeting next Tue?
>=20
> Viele Gr=C3=BC=C3=9Fe,
>=20
> Henk
>=20
> On 29.07.20 22:14, Laurence Lundblade wrote:
>> I presented this slide below the IETF 108 RATS meeting today. I =
believe it is critical that the RATS architecture allow for all uses =
case in the slide.
>> In particular RATS architecture must allow for symmetric keys. TPMs =
and public-key based crypto is too expensive for low-cost, large-scale =
IoT. There are real use cases supported my multiple companies using =
symmetric keys. Symmetric keys can be made secure at the verifier =E2=80=94=
 we secure keys for TLS at servers all the time using HSMs and such.
>> I do NOT want to put this taxonomy into the RATS architecture =
document. I don=E2=80=99t think that is necessary. I created the =
taxonomy as background information and as illustrative examples of real =
world designs.
>> I think there are options for adjusting the architecture document to =
accommodate this.
>>    Option 1) Expand the notion of an Endorsement quite a lot.
>>    Endorsements are not longer just static documents like X.509 certs
>>    and/or COSE/CMS signed blobs. They are anything that conveys the
>>    attestation key material into the Verifier or allows Verification =
of
>>    the attester. They must support confidentiality.
>>    Option 2) Replace the term =E2=80=9CEndorsement=E2=80=9D with =
something like
>>    =E2=80=9CVerifier Input=E2=80=9D or =E2=80=9CAttester Trust =
Criteria=E2=80=9D in the architecture
>>    document as the means by which key material goes into the =
Verifier.
>>    Endorsements still exist, but are just one type of Verifier Input =
or
>>    Attester Trust Criteria just like EAT is one kind of Attestation
>>    Evidence.
>> I have a slight preference for Option 2). I=E2=80=99m interested in =
opinions of which option to choose.
>> This is issue #65 =
<https://github.com/ietf-rats-wg/architecture/issues/65 =
<https://github.com/ietf-rats-wg/architecture/issues/65>>, opened in =
GitHub four months ago. It is not a last-minute/new issue. I believe it =
is in scope with the RATS charter as the charter explicitly mentions =
attestation key material in the Program of Work.
>> LL
>> My main point of this taxonomy was to affect the RATS architecture =
document. There was discussion today of it being a separate document =
perhaps outside of RATS. I=E2=80=99m happy for that to happen, but I =
don=E2=80=99t want to write it because I have enough RATS/EAT work to =
do. I=E2=80=99m very happy if other folks want to pick it up and use in =
other documents :-).
>> _______________________________________________
>> RATS mailing list
>> RATS@ietf.org <mailto:RATS@ietf.org>
>> https://www.ietf.org/mailman/listinfo/rats =
<https://www.ietf.org/mailman/listinfo/rats>

--Apple-Mail=_129FB8B8-6909-4C95-AB63-7EFF7CF1634A
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	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D"">Thanks for updating the issue. I will attend the architecture =
meeting when it is discussed. :-)<div class=3D""><br class=3D""></div><div=
 class=3D"">A good first step would be to determine if there is =
consensus that the 7 cases I described =
(TRUST_ANCHOR=E2=80=A6VERIFICATION_SERVICE) should be allowed and =
supported by RATS. There were no fundamental objections in the 108 RATS =
meeting, but it would be good to know explicitly there is consensus on =
this so we=E2=80=99re working from a common base.</div><div class=3D""><br=
 class=3D""></div><div class=3D"">Does anyone think RATS architecture =
should explicitly exclude any of these 7?</div><div class=3D""><br =
class=3D""></div><div class=3D"">LL</div><div class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jul 30, 2020, at 3:31 AM, Henk Birkholz &lt;<a =
href=3D"mailto:henk.birkholz@sit.fraunhofer.de" =
class=3D"">henk.birkholz@sit.fraunhofer.de</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">Hi Laurence,</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">I updated issue #65 for =
you:</span><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><blockquote type=3D"cite" style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><a =
href=3D"https://github.com/ietf-rats-wg/architecture/issues/65" =
class=3D"">https://github.com/ietf-rats-wg/architecture/issues/65</a><br =
class=3D""></blockquote><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">This will make it easier for the editors to address your two =
alternative proposals. I think it would help, if you are present when we =
discuss this.</span><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><span style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline !important;" class=3D"">MCR: do we =
plan for an editor's meeting next Tue?</span><br style=3D"caret-color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">Viele Gr=C3=BC=C3=9Fe,</span><br style=3D"caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">Henk</span><br style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">On 29.07.20 22:14, Laurence Lundblade wrote:</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" =
class=3D""><blockquote type=3D"cite" style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D"">I =
presented this slide below the IETF 108 RATS meeting today. I believe it =
is critical that the RATS architecture allow for all uses case in the =
slide.<br class=3D"">In particular RATS architecture must allow for =
symmetric keys. TPMs and public-key based crypto is too expensive for =
low-cost, large-scale IoT. There are real use cases supported my =
multiple companies using symmetric keys. Symmetric keys can be made =
secure at the verifier =E2=80=94 we secure keys for TLS at servers all =
the time using HSMs and such.<br class=3D"">I do NOT want to put this =
taxonomy into the RATS architecture document. I don=E2=80=99t think that =
is necessary. I created the taxonomy as background information and as =
illustrative examples of real world designs.<br class=3D"">I think there =
are options for adjusting the architecture document to accommodate =
this.<br class=3D"">&nbsp;&nbsp;&nbsp;Option 1) Expand the notion of an =
Endorsement quite a lot.<br class=3D"">&nbsp;&nbsp;&nbsp;Endorsements =
are not longer just static documents like X.509 certs<br =
class=3D"">&nbsp;&nbsp;&nbsp;and/or COSE/CMS signed blobs. They are =
anything that conveys the<br class=3D"">&nbsp;&nbsp;&nbsp;attestation =
key material into the Verifier or allows Verification of<br =
class=3D"">&nbsp;&nbsp;&nbsp;the attester. They must support =
confidentiality.<br class=3D"">&nbsp;&nbsp;&nbsp;Option 2) Replace the =
term =E2=80=9CEndorsement=E2=80=9D with something like<br =
class=3D"">&nbsp;&nbsp;&nbsp;=E2=80=9CVerifier Input=E2=80=9D or =
=E2=80=9CAttester Trust Criteria=E2=80=9D in the architecture<br =
class=3D"">&nbsp;&nbsp;&nbsp;document as the means by which key material =
goes into the Verifier.<br class=3D"">&nbsp;&nbsp;&nbsp;Endorsements =
still exist, but are just one type of Verifier Input or<br =
class=3D"">&nbsp;&nbsp;&nbsp;Attester Trust Criteria just like EAT is =
one kind of Attestation<br class=3D"">&nbsp;&nbsp;&nbsp;Evidence.<br =
class=3D"">I have a slight preference for Option 2). I=E2=80=99m =
interested in opinions of which option to choose.<br class=3D"">This is =
issue #65 &lt;<a =
href=3D"https://github.com/ietf-rats-wg/architecture/issues/65" =
class=3D"">https://github.com/ietf-rats-wg/architecture/issues/65</a>&gt;,=
&nbsp;opened in GitHub four months ago. It is not a last-minute/new =
issue. I believe it is in scope with the RATS charter as the charter =
explicitly mentions attestation key material in the Program of Work.<br =
class=3D"">LL<br class=3D"">My main point of this taxonomy was to affect =
the RATS architecture document. There was discussion today of it being a =
separate document perhaps outside of RATS. I=E2=80=99m happy for that to =
happen, but I don=E2=80=99t want to write it because I have enough =
RATS/EAT work to do. I=E2=80=99m very happy if other folks want to pick =
it up and use in other documents :-).<br =
class=3D"">_______________________________________________<br =
class=3D"">RATS mailing list<br class=3D""><a =
href=3D"mailto:RATS@ietf.org" class=3D"">RATS@ietf.org</a><br =
class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/rats" =
class=3D"">https://www.ietf.org/mailman/listinfo/rats</a></blockquote></di=
v></blockquote></div><br class=3D""></div></body></html>=

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From: Laurence Lundblade <lgl@island-resort.com>
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Cc: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, "rats@ietf.org" <rats@ietf.org>
To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
References: <AM0PR08MB371633B5B66CCC34BD38DB4BFA700@AM0PR08MB3716.eurprd08.prod.outlook.com> <b467f730-5000-0aad-9c2c-3bd3d92321e5@sit.fraunhofer.de>
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Subject: Re: [Rats] Age Claim in EAT
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In concept, age is the difference between time(VG) and time(EG) as =
described in RATS Architecture Appendix A.

I think time(EG) is when the token is signed (or otherwise =
cryptographically protected). I=E2=80=99m surprised that Appendix A =
doesn=E2=80=99t define it as that important moment. Claims can change =
after time(EG).

After Eric created the timing diagrams for architecture I re-thought the =
age claim. I don=E2=80=99t think it is a general independent claim, but =
rather is an attribute of individual claims, for example the age of a =
location or of a SW measurement.  PR #59 =
<https://github.com/ietf-rats-wg/eat/pull/59/files> removes it as a =
top-level claim and adds an age item to the location claim.

There was some discussion between these two options:
  - Define a general way to add attributes like age (or time stamp) to =
any claim =E2=80=94 A general claim decoration mechanism
  - Add an age (or time stamp) field to claims that need it

I=E2=80=99ve tended away from general attributes to keep code size and =
complexity down.

But what I really want to know is which manufacturer Endorses Henk, what =
is in his Endorsement and whether it is signed by a public key pair or a =
symmetric key. :-)

LL



> On Jul 29, 2020, at 2:11 AM, Henk Birkholz =
<henk.birkholz@sit.fraunhofer.de> wrote:
>=20
> Hi Hannes,
>=20
> in the scope of Evidence:
>=20
> Signing a CWT structure is creating an EAT. This event is defined as =
time(EG) here: =
https://tools.ietf.org/html/draft-ietf-rats-architecture-05#appendix-A
>=20
> "Creating a token" would mean "Evidence Generation", for example.
>=20
> Age also is a time interval based on a time unit (units that apply to =
Henk are years, I claim that Henk's age is 21, of course. Trust in =
Henk's Claims can be established via Endorsements). Age is a time =
interval expressed as a duration. That means that the beginning of that =
time interval is set as zero (an epoch) and then counts the time units.
>=20
> The semantics of age in EAT are:
>=20
> the epoch is time(EG) and the unit is seconds.
> This only works, if time sources for relative time-counters are =
available, of course.
>=20
> Collection of Claims - time(CC) was proposed to the architecture, but =
did not find consensus yet (we are working on time(AA), though, the time =
at which the Attester becomes aware of a changes value in the Target =
Environment right now).
>=20
> But! there is time(VG), the Value Generation. This time can often only =
be inferred or approximated (in contrast to time(AA)), but it is the =
best we have defined right now in the context of:
>=20
>> If that's the case, I wonder whether it would also make sense to take =
into account that different information may be collected at a different =
point in time and hence the age indication would better go (somehow) =
with specific claims where the time difference between the collection of =
the data and the signature generation matters.
>=20
> As a note: We have not talked at all before about the common concept =
of "latches" or stage transitions... this is an important concept that =
does capture the "this event has happened" (before/after a defined =
event) and represents strong security implications that are not included =
in the RATS architecture today. Would that maybe help in your context?
>=20
> Viele Gr=C3=BC=C3=9Fe,
>=20
> Henk
>=20
>=20
> On 29.07.20 10:37, Hannes Tschofenig wrote:
>> Hi Laurence, Hi all,
>> How does the age claim work?
>> The spec says "represents the number of seconds that have elapsed =
since the token was created".
>> By creating a token you also protect the claims with a signature and =
hence you cannot change the content of the claims anymore (without =
breaking the signature).
>> Hence, here "creating a token" must mean something different. I =
suspect it means when certain values have been collected from the device =
and before the token with the signature was put together. Correct?
>> If that's the case, I wonder whether it would also make sense to take =
into account that different information may be collected at a different =
point in time and hence the age indication would better go (somehow) =
with specific claims where the time difference between the collection of =
the data and the signature generation matters. I also wonder whether the =
number of seconds matter and whether you really want to communicate =
something more abstract, such as "I created a hash over the firmware =
during boot time" rather than "I created the hash over the firmware in =
real-time when I was asked".
>> Ciao
>> Hannes
>> IMPORTANT NOTICE: The contents of this email and any attachments are =
confidential and may also be privileged. If you are not the intended =
recipient, please notify the sender immediately and do not disclose the =
contents to any other person, use it for any purpose, or store or copy =
the information in any medium. Thank you.
>> _______________________________________________
>> RATS mailing list
>> RATS@ietf.org
>> https://www.ietf.org/mailman/listinfo/rats
>=20
> _______________________________________________
> RATS mailing list
> RATS@ietf.org
> https://www.ietf.org/mailman/listinfo/rats


--Apple-Mail=_37C70FCD-672A-4FEE-835B-1C39D4DB5D92
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	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D"">In concept, age is the difference between time(VG) and =
time(EG) as described in RATS Architecture Appendix A.</div><div =
class=3D""><br class=3D""></div><div class=3D"">I think time(EG) is when =
the token is signed (or otherwise cryptographically protected). I=E2=80=99=
m surprised that Appendix A doesn=E2=80=99t define it as that important =
moment. Claims can change after time(EG).</div><div class=3D""><br =
class=3D""></div><div class=3D"">After Eric created the timing diagrams =
for architecture I re-thought the age claim. I don=E2=80=99t think it is =
a general independent claim, but rather is an attribute of individual =
claims, for example the age of a location or of a SW measurement. =
&nbsp;<a href=3D"https://github.com/ietf-rats-wg/eat/pull/59/files" =
class=3D"">PR #59</a>&nbsp;removes it as a top-level claim and adds an =
age item to the location claim.</div><div class=3D""><br =
class=3D""></div><div class=3D"">There was some discussion between these =
two options:</div><div class=3D"">&nbsp; - Define a general way to add =
attributes like age (or time stamp) to any claim =E2=80=94 A general =
claim decoration mechanism</div><div class=3D"">&nbsp; - Add an age (or =
time stamp) field to claims that need it</div><div class=3D""><br =
class=3D""></div><div class=3D"">I=E2=80=99ve tended away from general =
attributes to keep code size and complexity down.</div><div class=3D""><br=
 class=3D""></div><div class=3D"">But what I really want to know is =
which manufacturer Endorses Henk, what is in his Endorsement and whether =
it is signed by a public key pair or a symmetric key. :-)</div><div =
class=3D""><br class=3D""></div><div class=3D"">LL</div><div =
class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">On Jul 29, 2020, at 2:11 AM, Henk Birkholz =
&lt;<a href=3D"mailto:henk.birkholz@sit.fraunhofer.de" =
class=3D"">henk.birkholz@sit.fraunhofer.de</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D"">Hi =
Hannes,<br class=3D""><br class=3D"">in the scope of Evidence:<br =
class=3D""><br class=3D"">Signing a CWT structure is creating an EAT. =
This event is defined as time(EG) here: <a =
href=3D"https://tools.ietf.org/html/draft-ietf-rats-architecture-05#append=
ix-A" =
class=3D"">https://tools.ietf.org/html/draft-ietf-rats-architecture-05#app=
endix-A</a><br class=3D""><br class=3D"">"Creating a token" would mean =
"Evidence Generation", for example.<br class=3D""><br class=3D"">Age =
also is a time interval based on a time unit (units that apply to Henk =
are years, I claim that Henk's age is 21, of course. Trust in Henk's =
Claims can be established via Endorsements). Age is a time interval =
expressed as a duration. That means that the beginning of that time =
interval is set as zero (an epoch) and then counts the time units.<br =
class=3D""><br class=3D"">The semantics of age in EAT are:<br =
class=3D""><br class=3D"">the epoch is time(EG) and the unit is =
seconds.<br class=3D"">This only works, if time sources for relative =
time-counters are available, of course.<br class=3D""><br =
class=3D"">Collection of Claims - time(CC) was proposed to the =
architecture, but did not find consensus yet (we are working on =
time(AA), though, the time at which the Attester becomes aware of a =
changes value in the Target Environment right now).<br class=3D""><br =
class=3D"">But! there is time(VG), the Value Generation. This time can =
often only be inferred or approximated (in contrast to time(AA)), but it =
is the best we have defined right now in the context of:<br class=3D""><br=
 class=3D""><blockquote type=3D"cite" class=3D"">If that's the case, I =
wonder whether it would also make sense to take into account that =
different information may be collected at a different point in time and =
hence the age indication would better go (somehow) with specific claims =
where the time difference between the collection of the data and the =
signature generation matters.<br class=3D""></blockquote><br class=3D"">As=
 a note: We have not talked at all before about the common concept of =
"latches" or stage transitions... this is an important concept that does =
capture the "this event has happened" (before/after a defined event) and =
represents strong security implications that are not included in the =
RATS architecture today. Would that maybe help in your context?<br =
class=3D""><br class=3D"">Viele Gr=C3=BC=C3=9Fe,<br class=3D""><br =
class=3D"">Henk<br class=3D""><br class=3D""><br class=3D"">On 29.07.20 =
10:37, Hannes Tschofenig wrote:<br class=3D""><blockquote type=3D"cite" =
class=3D"">Hi Laurence, Hi all,<br class=3D"">How does the age claim =
work?<br class=3D"">The spec says "represents the number of seconds that =
have elapsed since the token was created".<br class=3D"">By creating a =
token you also protect the claims with a signature and hence you cannot =
change the content of the claims anymore (without breaking the =
signature).<br class=3D"">Hence, here "creating a token" must mean =
something different. I suspect it means when certain values have been =
collected from the device and before the token with the signature was =
put together. Correct?<br class=3D"">If that's the case, I wonder =
whether it would also make sense to take into account that different =
information may be collected at a different point in time and hence the =
age indication would better go (somehow) with specific claims where the =
time difference between the collection of the data and the signature =
generation matters. I also wonder whether the number of seconds matter =
and whether you really want to communicate something more abstract, such =
as "I created a hash over the firmware during boot time" rather than "I =
created the hash over the firmware in real-time when I was asked".<br =
class=3D"">Ciao<br class=3D"">Hannes<br class=3D"">IMPORTANT NOTICE: The =
contents of this email and any attachments are confidential and may also =
be privileged. If you are not the intended recipient, please notify the =
sender immediately and do not disclose the contents to any other person, =
use it for any purpose, or store or copy the information in any medium. =
Thank you.<br =
class=3D"">_______________________________________________<br =
class=3D"">RATS mailing list<br class=3D""><a =
href=3D"mailto:RATS@ietf.org" class=3D"">RATS@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/rats<br =
class=3D""></blockquote><br =
class=3D"">_______________________________________________<br =
class=3D"">RATS mailing list<br class=3D""><a =
href=3D"mailto:RATS@ietf.org" class=3D"">RATS@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/rats<br =
class=3D""></div></div></blockquote></div><br class=3D""></body></html>=

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# Major Concerns

In Section 3.1, the re are two MUST requirements, but they are not =
presented clearly.  The are:

   1)  The secure channel MUST authenticate the Verifier to the =
Attester.

   2)  The secure channel MUST protect the integrity of the =
communications from the Verifier to the Attester.

The way it is written also requires integrity protection in both =
directions.  Is that really needed?

In Section 3.1, says:

   Further, the provider of the UCCS SHOULD be
   authenticated by the reciever to ensure the channel is truly secured
   and the sender is validated.

I do not understand what this is trying to say beyond the MUST =
requirement above.  Maybe part of the problem is the mixing of the =
discussion about authentication and integrity.

In Section 3, when talking about confidentiality, I think that it would =
be better to say:

      If confidentiality is also required, the secure channel SHOULD =
mutually authenticate Verifier and the Attester.


# Minor concerns

In section 1, the phrase "Secure Channel provides the correct =
properties" is a bit troublesome.  The properties are not difficult to =
explain in a sentence or two, so they should just be stated here.  Also, =
the sentences that follow can be omitted if you simply include in the =
summary of the "correct properties" that the party sending the UCCS is =
authenticated.

In Section 1.1, please add Verifier and Attester the the terms that are =
defined.


# Nits

General: Why are Claim and Secure Chanel capitalized?

In section 1.1, please add a reference for the CWT Claims Registry.

In section 2, please add a reference for a device's trusted execution =
environment (probably the TEEP architecture draft).


Russ=


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Subject: [Rats] Primary and secondary trust flows in RATS
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	charset=utf-8

In recently reviewing the RATS architecture, I think the trust flows =
between the major entities can be classified as primary and secondary.

The primary trust flow is how the RP comes trust to the =
attester/device/manufacturer. It is the main purpose of attestation.

The secondary trust flow is about privacy and confidentiality of =
endorsements, policy, evidence and results. You can do attestation =
without it if there is nothing to hide.

Below are diagrams for both. =20

I went through the Trust Model (7) section of  =
draft-thaler-rats-architecture-05 and could easily classify each =
paragraph as to whether it addresses the primary or secondary trust =
flow, which I think validates the primary/secondary distinction.

I=E2=80=99m sharing this here on the RATS list rather than just filing =
issues and PRs against RATS architecture because I think it is a useful =
general concept, but also think it would be helpful to incorporate it =
into the document:
Consider adding the diagrams below to the document and the transitive =
nature of the primary trust flow
The sections on the Attester (7.2) and Endorser (7.5) only discuss the =
secondary trust flow. I think they really need to have text about there =
role in the primary trust flow.
7.4 on the Verifier Trust is very confusing to me. I don=E2=80=99t think =
Verifiers ever trust Attesters directly. It is only through the =
Endorser/Manufacturer that they come to transitively trust an  Attester
LL








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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">In =
recently reviewing the RATS architecture, I think the trust flows =
between the major entities can be classified as <i =
class=3D"">primary</i>&nbsp;and <i class=3D"">secondary</i>.<div =
class=3D""><br class=3D""></div><div class=3D"">The primary trust flow =
is how the RP comes trust to the attester/device/manufacturer. It is the =
main purpose of attestation.</div><div class=3D""><br =
class=3D""></div><div class=3D"">The secondary trust flow is about =
privacy and confidentiality of endorsements, policy, evidence and =
results. You can do attestation without it if there is nothing to =
hide.</div><div class=3D""><br class=3D""></div><div class=3D"">Below =
are diagrams for both. &nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D"">I went through the Trust Model (7) =
section of &nbsp;draft-thaler-rats-architecture-05 and could easily =
classify each paragraph as to whether it addresses the primary or =
secondary trust flow, which I think validates the primary/secondary =
distinction.</div><div class=3D""><br class=3D""></div><div =
class=3D"">I=E2=80=99m sharing this here on the RATS list rather than =
just filing issues and PRs against RATS architecture because I think it =
is a useful general concept, but also think it would be helpful to =
incorporate it into the document:</div><div class=3D""><ul class=3D""><li =
class=3D"">Consider adding the diagrams below to the document and the =
transitive nature of the primary trust flow</li><li class=3D"">The =
sections on the Attester (7.2) and Endorser (7.5) only discuss the =
secondary trust flow. I think they really need to have text about there =
role in the primary trust flow.</li><li class=3D"">7.4 on the Verifier =
Trust is very confusing to me. I don=E2=80=99t think Verifiers ever =
trust Attesters directly. It is only through the Endorser/Manufacturer =
that they come to transitively trust an =
&nbsp;Attester</li></ul></div><div class=3D"">LL</div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div class=3D""><img=
 apple-inline=3D"yes" id=3D"0EE09FE5-0373-4F93-9136-EAE0A555A629" =
src=3D"cid:D26AC383-4111-4BAE-9E65-E7909604056E" class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D""><img apple-inline=3D"yes" =
id=3D"CF3D9A82-1DFD-45B2-BD9F-34F175D6546A" =
src=3D"cid:A28AD3CD-2CF1-40C2-B7EE-B0431742BD82" =
class=3D""></div></body></html>=

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--Apple-Mail=_AEBCD08F-8D9F-4A83-B664-586F8E8732B4--

--Apple-Mail=_002D4070-A15C-414F-BB6C-73E7D7FA0A3D--

