From robert.cragie@gridmerge.com  Tue Apr 10 03:28:49 2012
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From: Robert Cragie <robert.cragie@gridmerge.com>
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Subject: Re: [Pana] Fwd: New Version Notification for draft-yegin-pana-encr-avp-01.txt
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Tanaka-san,

Thank you for your comments. I have responded inline, bracketed by=20
<RCC></RCC>.

Robert

On 26/03/2012 7:00 AM, Yasuyuki Tanaka wrote:
> Hi,
>
> I've read the draft and I have four comments. Please see them below.
>
> Best,
> Yasuyuki Tanaka
>
> ---------------------------------------------------------------------
>
> (1) Section 3
> I found a typo in the last sentence.
>
> >   The length of PANA_ENCR_KEY depends on the integrity algorithm in
> >   use.
>
> should be
>
>     The length of PANA_ENCR_KEY depends on the *encryption* algorithm i=
n
>     use.
<RCC>Agreed, good catch.</RCC>
>
> ---------------------------------------------------------------------
>
> (2) Section 4
> I've not found text about key size of AES to be used for
> AES_CTR. Probably 128-bit is assumed.
>
> It would be better to clarify the key size to be used for the
> algorithm and to use "AES128_CTR" or something instead of "AES_CTR".
<RCC>Agreed.</RCC>
>
> ---------------------------------------------------------------------
>
> (3) Section 4
> The definition of "q" is different between the draft and NIST
> SP800-38C. In this draft, "q" is defined as "octet length of message
> length field." But in NIST SP800-38C, "q" is defined as "The octet
> length of the binary representation of the octet length of the
> payload."
>
> In addition, I don't realize what 'length of message length field'
> means... Why is "q" 3? The length of "Message Length" field of PANA
> Message Header is 2 octets...
>
> Anyway, I think the following part might cause some confusion.
>
> >      AES-CTR (Counter) encryption algorithm as specified in
> >      [NIST_SP800_38A].  The formatting function and counter generatio=
n
> >      function as specified in Appendix A of [NIST_SP800_38C] are used=
,
> >      with the following parameters:
> >
> >
> >            n, octet length of nonce, is 12.
> >            q, octet length of message length field, is 3.
>
> IMHO, it's better to say just "q is 3" as the definition of "q".
<RCC>Agreed. It was chosen at 3 to be consistent with the use of CCM in=20
the proposed TLS cipher suites.</RCC>
>
> ---------------------------------------------------------------------
>
> (4) Section 4
> It would be very helpful to provide an example of the first counter.
>
> When Key-Id is 0x55667788, Session ID is 0xaabbccdd, and Sequence
> Number is 0x11223344, the correct first counter is
> 0x0255667788aabbccdd11223344000001. is it correct?
<RCC>That is correct. I will include the example as given.</RCC>


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I have posted a new revision with changes due to Tanaka-san's comments=20
in place. Please review and provide any further feedback to the list.

Thank you

Robert

-------- Original Message --------
Subject: 	New Version Notification for draft-yegin-pana-encr-avp-02.txt
Date: 	Tue, 10 Apr 2012 03:45:04 -0700
From: 	internet-drafts@ietf.org
To: 	robert.cragie@gridmerge.com
CC: 	alper.yegin@yegin.org



A new version of I-D, draft-yegin-pana-encr-avp-02.txt has been successfu=
lly submitted by Robert Cragie and posted to the IETF repository.

Filename:	 draft-yegin-pana-encr-avp
Revision:	 02
Title:		 Encrypting PANA AVPs
Creation date:	 2012-04-10
WG ID:		 Individual Submission
Number of pages: 9

Abstract:
    This document specifies a mechanism for delivering PANA (Protocol for=

    Carrying Authentication for Network Access) AVPs (Attribute-Value
    Pairs) in encrypted form.




The IETF Secretariat



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<html>
  <head>

    <meta http-equiv=3D"content-type" content=3D"text/html; charset=3DUTF=
-8">
  </head>
  <body bgcolor=3D"#FFFFFF" text=3D"#000000">
    I have posted a new revision with changes due to Tanaka-san's
    comments in place. Please review and provide any further feedback to
    the list.<br>
    <br>
    Thank you<br>
    <br>
    Robert<br>
    <br>
    -------- Original Message --------
    <table class=3D"moz-email-headers-table" border=3D"0" cellpadding=3D"=
0"
      cellspacing=3D"0">
      <tbody>
        <tr>
          <th align=3D"RIGHT" nowrap=3D"nowrap" valign=3D"BASELINE">Subje=
ct: </th>
          <td>New Version Notification for
            draft-yegin-pana-encr-avp-02.txt</td>
        </tr>
        <tr>
          <th align=3D"RIGHT" nowrap=3D"nowrap" valign=3D"BASELINE">Date:=
 </th>
          <td>Tue, 10 Apr 2012 03:45:04 -0700</td>
        </tr>
        <tr>
          <th align=3D"RIGHT" nowrap=3D"nowrap" valign=3D"BASELINE">From:=
 </th>
          <td><a class=3D"moz-txt-link-abbreviated" href=3D"mailto:intern=
et-drafts@ietf.org">internet-drafts@ietf.org</a></td>
        </tr>
        <tr>
          <th align=3D"RIGHT" nowrap=3D"nowrap" valign=3D"BASELINE">To: <=
/th>
          <td><a class=3D"moz-txt-link-abbreviated" href=3D"mailto:robert=
=2Ecragie@gridmerge.com">robert.cragie@gridmerge.com</a></td>
        </tr>
        <tr>
          <th align=3D"RIGHT" nowrap=3D"nowrap" valign=3D"BASELINE">CC: <=
/th>
          <td><a class=3D"moz-txt-link-abbreviated" href=3D"mailto:alper.=
yegin@yegin.org">alper.yegin@yegin.org</a></td>
        </tr>
      </tbody>
    </table>
    <br>
    <br>
    <pre>A new version of I-D, draft-yegin-pana-encr-avp-02.txt has been =
successfully submitted by Robert Cragie and posted to the IETF repository=
=2E

Filename:	 draft-yegin-pana-encr-avp
Revision:	 02
Title:		 Encrypting PANA AVPs
Creation date:	 2012-04-10
WG ID:		 Individual Submission
Number of pages: 9

Abstract:
   This document specifies a mechanism for delivering PANA (Protocol for
   Carrying Authentication for Network Access) AVPs (Attribute-Value
   Pairs) in encrypted form.

                                                                         =
        =20


The IETF Secretariat

</pre>
  </body>
</html>

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