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Subject: RE: Call for feedback: Security requirements for IETF IPDVB  WG - Inputs
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Hi All,
=20
Reading the excerpt on the final report of the TTCP, C3I, Technical =
Panels 6 & 8, Workshop on Future Coalition Operational and Tactical IP =
Networking, makes a case for the security requirements and hopefully the =
security extension work in the IP-DVB working group.
=20
=20
Cheers
Sunny
=20
***********************************************************
Sunil Iyengar,
Research Fellow, Networks Group,
Centre For Communication And Systems Research(CCSR),
School of Electronics, Computing & Mathematics,
University Of Surrey, Guildford GU2 7XH,
Surrey, England, United Kingdom.
Office: +44 (0)1483 686008
***********************************************************


________________________________

From: owner-ipdvb@erg.abdn.ac.uk on behalf of Gorry Fairhurst
Sent: Mon 20/11/2006 10:35
To: ipdvb@erg.abdn.ac.uk
Subject: Re: Call for feedback: Security requirements for IETF IPDVB WG =
- Inputs



Gorry Fairhurst wrote:
> If you think this work is useful (should progress) please do email =
either
> the ipdvb WG list or the WG Chair. Comments on this topic should be =
received
> before 24th November 2006.
>
> ---
>
<snip>

I have been forwarded an excerpt from the final report of the TTCP, C3I,
Technical Panels 6 & 8, Workshop on Future Coalition Operational and
Tactical IP Networking, held in September 2005.

This report was prepared following a joint workshop on Miliatry IP
networks, and included a detailed discussion of security issues (see
attached). There was a delay in releasing these findings, but they now
arrive at an appropriate time to allow dicussion on the above WG call.

Please do send comments, to the ipdvb mailing list,

Best wishes,

Gorry Fairhurst

<<FCOTIPN IETF Recommendations v1.pdf>>
http://www.erg.abdn.ac.uk/ip-dvb/docs/FCOTIPN%20IETF%20Recommendations%20=
v1.pdf





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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">=0A=
<HTML>=0A=
<HEAD>=0A=
=0A=
<META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
6.5.7226.0">=0A=
<TITLE>Re: Call for feedback: Security requirements for IETF IPDVB  WG - =
Inputs</TITLE>=0A=
</HEAD>=0A=
<BODY>=0A=
<DIV id=3DidOWAReplyText60717 dir=3Dltr>=0A=
<DIV dir=3Dltr><FONT face=3DArial color=3D#000000 size=3D2>Hi =
All,</FONT></DIV>=0A=
<DIV dir=3Dltr>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Reading the excerpt on the =
final report of =0A=
the TTCP, C3I, Technical Panels 6 &amp; 8, Workshop on Future Coalition =0A=
Operational and Tactical IP Networking, makes a case for the security =0A=
requirements and hopefully the security extension work in the IP-DVB =
working =0A=
group.</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Cheers</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Sunny</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial color=3D#000000 =
size=3D2></FONT>&nbsp;</DIV></DIV>=0A=
<DIV id=3DidSignature39986 dir=3Dltr>=0A=
<DIV><FONT face=3DArial color=3D#000000 =0A=
size=3D2>***********************************************************<BR>S=
unil =0A=
Iyengar,<BR>Research Fellow, Networks Group,<BR>Centre For Communication =
And =0A=
Systems Research(CCSR),<BR>School of Electronics, Computing &amp; =0A=
Mathematics,<BR>University Of Surrey, Guildford GU2 7XH,<BR>Surrey, =
England, =0A=
United Kingdom.<BR>Office: +44 (0)1483 =0A=
686008<BR>***********************************************************<BR>=
</FONT></DIV></DIV>=0A=
<DIV dir=3Dltr><BR>=0A=
<HR tabIndex=3D-1>=0A=
<FONT face=3DTahoma size=3D2><B>From:</B> owner-ipdvb@erg.abdn.ac.uk on =
behalf of =0A=
Gorry Fairhurst<BR><B>Sent:</B> Mon 20/11/2006 10:35<BR><B>To:</B> =0A=
ipdvb@erg.abdn.ac.uk<BR><B>Subject:</B> Re: Call for feedback: Security =0A=
requirements for IETF IPDVB WG - Inputs<BR></FONT><BR></DIV>=0A=
<DIV>=0A=
<P><FONT size=3D2>Gorry Fairhurst wrote:<BR>&gt; If you think this work =
is useful =0A=
(should progress) please do email either<BR>&gt; the ipdvb WG list or =
the WG =0A=
Chair. Comments on this topic should be received<BR>&gt; before 24th =
November =0A=
2006.<BR>&gt;<BR>&gt; ---<BR>&gt;<BR>&lt;snip&gt;<BR><BR>I have been =
forwarded =0A=
an excerpt from the final report of the TTCP, C3I,<BR>Technical Panels 6 =
&amp; =0A=
8, Workshop on Future Coalition Operational and<BR>Tactical IP =
Networking, held =0A=
in September 2005.<BR><BR>This report was prepared following a joint =
workshop on =0A=
Miliatry IP<BR>networks, and included a detailed discussion of security =
issues =0A=
(see<BR>attached). There was a delay in releasing these findings, but =
they =0A=
now<BR>arrive at an appropriate time to allow dicussion on the above WG =0A=
call.<BR><BR>Please do send comments, to the ipdvb mailing =
list,<BR><BR>Best =0A=
wishes,<BR><BR>Gorry Fairhurst<BR><BR>&lt;&lt;FCOTIPN IETF =
Recommendations =0A=
v1.pdf&gt;&gt;<BR><A =0A=
href=3D"http://www.erg.abdn.ac.uk/ip-dvb/docs/FCOTIPN%20IETF%20Recommenda=
tions%20v1.pdf">http://www.erg.abdn.ac.uk/ip-dvb/docs/FCOTIPN%20IETF%20Re=
commendations%20v1.pdf</A><BR><BR><BR></FONT></P></DIV>=0A=
=0A=
</BODY>=0A=
</HTML>
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Hi All,
Please find my comments=20
=20
Cheers
Sunny
=20
=20

________________________________

From: owner-ipdvb@erg.abdn.ac.uk on behalf of Gorry Fairhurst
Sent: Tue 21/11/2006 17:57
To: ipdvb@erg.abdn.ac.uk
Subject: Comments on draft-cruickshank security requirements




I have the following comments which I would like to discuss on the ipdvb
mailing list.

Gorry Fairhurst
(as ipdvb WG Chair)

---

Comments/Issues:

1) Are the scenarios OK? are they applicable to all deployments?  with
satellite, cable, S2, Terrestrial, ATSC, etc?

//Sunny

//Yes it reflects in th enew draft i.e. in the threat scenarios which have =
been expanded


2) I think we need to tease out the work on what is meant by L2
authentication on pt-2-pt or pt-2-mpt links? Appropriate authentication
methods must be determined... In Internet security =B3integrity=B2 is often=
 more
important than =B3confidentiality=B2 - but for these links we suggest the
converse is true - since authentication and e2e delivery checks are best
provided at of above the IP Layers... Where do we judge what are the
appropriate goals for level 2 authentication?


//Sunny

//I think it has been clarified in the new draft (hopefully)



3) I didn't understand what you meant by:
Page 9:
/problematic in the case of broadcast networks such as MPEG-2 transmission
networks. /
- why? - because of easy availability of receiver hardware and the wide
geographical span of the networks... or other reasons?

//Sunny

//Yes thats what we were trying to say. Anyway changed it to be more precise


4) I would like to see more references to methods used by DVB/MPEG-2 network
architectures ...
* How is the proposal positioned against technologies from say the IEEE (for
802.14; 802.16).

=20

//Sunny

//Any suggestions ?????



5) Finally: Algorithm agility is required (crypto algorithms, hashes, become
obsolete and need to be updated) for all IETF security mechanisms, this
should be a clear & distinct requirement for the work this document
proposes.


//Sunny

//Agree and has been added to the new draft
-----------------------------------------------------------------



Cheers

Sunny







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Hi All,
Please find my comments=20
=20
Cheers
Sunny
=20
=20

________________________________

From: owner-ipdvb@erg.abdn.ac.uk on behalf of Gorry Fairhurst
Sent: Tue 21/11/2006 17:57
To: ipdvb@erg.abdn.ac.uk
Subject: Comments on draft-cruickshank security requirements




I have the following comments which I would like to discuss on the ipdvb
mailing list.

Gorry Fairhurst
(as ipdvb WG Chair)

---

Comments/Issues:

1) Are the scenarios OK? are they applicable to all deployments?  with
satellite, cable, S2, Terrestrial, ATSC, etc?

//Sunny

//Yes it reflects in th enew draft i.e. in the threat scenarios which hav=
e been expanded


2) I think we need to tease out the work on what is meant by L2
authentication on pt-2-pt or pt-2-mpt links? Appropriate authentication
methods must be determined... In Internet security =B3integrity=B2 is oft=
en more
important than =B3confidentiality=B2 - but for these links we suggest the
converse is true - since authentication and e2e delivery checks are best
provided at of above the IP Layers... Where do we judge what are the
appropriate goals for level 2 authentication?


//Sunny

//I think it has been clarified in the new draft (hopefully)



3) I didn't understand what you meant by:
Page 9:
/problematic in the case of broadcast networks such as MPEG-2 transmissio=
n
networks. /
- why? - because of easy availability of receiver hardware and the wide
geographical span of the networks... or other reasons?

//Sunny

//Yes thats what we were trying to say. Anyway changed it to be more prec=
ise


4) I would like to see more references to methods used by DVB/MPEG-2 netw=
ork
architectures ...
* How is the proposal positioned against technologies from say the IEEE (=
for
802.14; 802.16).

=20

//Sunny

//Any suggestions ?????



5) Finally: Algorithm agility is required (crypto algorithms, hashes, bec=
ome
obsolete and need to be updated) for all IETF security mechanisms, this
should be a clear & distinct requirement for the work this document
proposes.


//Sunny

//Agree and has been added to the new draft
-----------------------------------------------------------------



Cheers

Sunny







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Subject: RE: ULE Security Requirements : NiTs on text
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Hi All,
Please find the comments inline. All the comments are incorporated in the n=
ew version of the draft ( a diff of this will be posted on the IPDVB mailin=
g list for comments)
=20
=20
Cheers
Sunny
=20
________________________________

From: owner-ipdvb@erg.abdn.ac.uk on behalf of Gorry Fairhurst
Sent: Tue 21/11/2006 17:56
To: ipdvb@erg.abdn.ac.uk
Subject: ULE Security Requirements : NiTs on text




Dear authors,

I have the following NiTs/Comments on the text.

Best wishes,

Gorry


----
Page 7:
/(e.g. by an Encapsulation Gateway) or other device to/
/(e.g. by an Encapsulation Gateway or other device) to/


//Sunny

DONE

done                                                  ^
--
/these messages are broadcasted/
                             ^^
/these messages are broadcast/

//Sunny

done
---
/is out of scope for ULE security/
--  [ID.ule.ext] describes a method where they could be encapsulated using
ULE, allowing ULE security methods to also be used in these cases.

/eliminates the need to consider/
-- Well you do need to consider them in this document, but securing these
elements is an orthogonal issue...

//Sunny

//Agree with this and have added a reference to it


---
/ The PID associated with an Elementary Stream can be modified /
/ The PID associated with an Elementary Stream can therefore be modified/
                                                   ^^^^^^^^^
//Sunny

done


/a passive threat. It includes/
/a passive threat. This includes/
                   ^^^^
//Sunny

done

----
Section 3.2
-- perhaps a forward pointer to a later section that =B3masquerading and
modification=B2 are more difficult on a specific link, than they are in the
general internet, and will be described more in section 3.

//Sunny

any suggestions ?????
----

/defines services for Internet Protocol (IP)/
/defines services for the Internet Protocol (IP)/
     //Sunny

done                ^^^
---
/There is an extra overheads associated /
/There is an extra transmission overhead associated /
                   ^^^^^^^^^^^^^^^^^^^^^^
- is this what is meant?

//Sunny

Yes and its changed
---
At the end of section 5, I would also like to say that any defined method
must also be capable of operating with ULE extension headers - specifically
it should allow encryption of a compressed SNDU payload...

//Sunny

Added as a new requirement
---
/   This method does not preclude the use of IPsec at L3 (or TLS [RFC4346]
at L4)./
 - True, but I would have preferred to be stronger and continued further to
state that IPsec and TLS can provide strong authentication
of the end-points in the communication. This authentication is desirable in
many scenarios to ensure the information the information
is being exchanged between the correct trusted entities. Layer 2 methods can
not provide this guarantee.


- I=B9d also prefer to break the final para into two,the  re-use of
established techniques is desirable, but distinct from the advantages of
 IPsec/TLS, etc.


//Sunny

//Have rewritten it reflect the change

----
/ 2 NPA address. In broadcast networks this can /
/ 2 NPA address. In broadcast networks this protection can /

=20

//Sunny

//Done
                                            ^^^^^^^^^^
---
/Case 2 is likely to a lesser degree within certain network configurations./
- Can you provide one of two concrete examples?
/Therefore case  3 is not considered further in this document. /
- Is it therefore assumed that the MPEG-2 transmission equipment
(multiplexors, etc) are secure? I think this was suggested on the list?

=20

//SUnny

Done

---


Thanks=20

Sunny







------_=_NextPart_001_01C7157B.5A25730A
Content-Type: text/plain; name="msg-7098-1231.txt"
Content-Disposition: attachment; filename="msg-7098-1231.txt"
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Hi All,
Please find the comments inline. All the comments are incorporated in the=
 new version of the draft ( a diff of this will be posted on the IPDVB ma=
iling list for comments)
=20
=20
Cheers
Sunny
=20
________________________________

From: owner-ipdvb@erg.abdn.ac.uk on behalf of Gorry Fairhurst
Sent: Tue 21/11/2006 17:56
To: ipdvb@erg.abdn.ac.uk
Subject: ULE Security Requirements : NiTs on text




Dear authors,

I have the following NiTs/Comments on the text.

Best wishes,

Gorry


----
Page 7:
/(e.g. by an Encapsulation Gateway) or other device to/
/(e.g. by an Encapsulation Gateway or other device) to/


//Sunny

DONE

done                                                  ^
--
/these messages are broadcasted/
                             ^^
/these messages are broadcast/

//Sunny

done
---
/is out of scope for ULE security/
--  [ID.ule.ext] describes a method where they could be encapsulated usin=
g
ULE, allowing ULE security methods to also be used in these cases.

/eliminates the need to consider/
-- Well you do need to consider them in this document, but securing these
elements is an orthogonal issue...

//Sunny

//Agree with this and have added a reference to it


---
/ The PID associated with an Elementary Stream can be modified /
/ The PID associated with an Elementary Stream can therefore be modified/
                                                   ^^^^^^^^^
//Sunny

done


/a passive threat. It includes/
/a passive threat. This includes/
                   ^^^^
//Sunny

done

----
Section 3.2
-- perhaps a forward pointer to a later section that =B3masquerading and
modification=B2 are more difficult on a specific link, than they are in t=
he
general internet, and will be described more in section 3.

//Sunny

any suggestions ?????
----

/defines services for Internet Protocol (IP)/
/defines services for the Internet Protocol (IP)/
     //Sunny

done                ^^^
---
/There is an extra overheads associated /
/There is an extra transmission overhead associated /
                   ^^^^^^^^^^^^^^^^^^^^^^
- is this what is meant?

//Sunny

Yes and its changed
---
At the end of section 5, I would also like to say that any defined method
must also be capable of operating with ULE extension headers - specifical=
ly
it should allow encryption of a compressed SNDU payload...

//Sunny

Added as a new requirement
---
/   This method does not preclude the use of IPsec at L3 (or TLS [RFC4346=
]
at L4)./
 - True, but I would have preferred to be stronger and continued further =
to
state that IPsec and TLS can provide strong authentication
of the end-points in the communication. This authentication is desirable =
in
many scenarios to ensure the information the information
is being exchanged between the correct trusted entities. Layer 2 methods =
can
not provide this guarantee.


- I=B9d also prefer to break the final para into two,the  re-use of
established techniques is desirable, but distinct from the advantages of
 IPsec/TLS, etc.


//Sunny

//Have rewritten it reflect the change

----
/ 2 NPA address. In broadcast networks this can /
/ 2 NPA address. In broadcast networks this protection can /

=20

//Sunny

//Done
                                            ^^^^^^^^^^
---
/Case 2 is likely to a lesser degree within certain network configuration=
s./
- Can you provide one of two concrete examples?
/Therefore case  3 is not considered further in this document. /
- Is it therefore assumed that the MPEG-2 transmission equipment
(multiplexors, etc) are secure? I think this was suggested on the list?

=20

//SUnny

Done

---


Thanks=20

Sunny







------_=_NextPart_001_01C7157B.5A25730A--



From owner-ipdvb@erg.abdn.ac.uk Fri Dec 01 14:47:04 2006
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Date: Fri, 01 Dec 2006 19:32:19 +0000
From: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
Organization: University of Aberdeen, UK
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Subject: Re: ULE Security Requirements : NiTs on text
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Thanks Sunny for doing all those edits, and responding to my questions.

You specifically asked for clarification on:

<snip>

Section 3.2
-- perhaps a forward pointer to a later section that =B3masquerading and
modification=B2 are more difficult on a specific link, than they are in t=
he
general internet, and will be described more in section 3.

//Sunny

any suggestions ?????

GF - I was thinking here that a key driver in the design of IPsec, and=20
one that is often stated by our security ADs is that one must protect=20
from masquerading and modification of IP packets, this being=20
comparatively easy in an Internet environment. So, my suggestion was to=20
agree with such arguments, but then to state for link-layer security fro=20
broadcast links that you note such attacks are in fact MUCH harder.
- This could for instance motivate the use of sequence numbers in IPsec,=20
but not the mandatory use of them on synchronous links.


<snip>

and on:

<snip>
4) I would like to see more references to methods used by DVB/MPEG-2=20
network architectures ...
* How is the proposal positioned against technologies from say the IEEE=20
(for 802.14; 802.16).

//Sunny

//Any suggestions ?????

<snip>

- I don't know the answer... does anyone else?


I now suggest that you make a new revision of the draft and upload to=20
the web site (I can do this for you), so we can see the interim version,=20
and see if Michael and others can see if they have anything more to add=20
at this stage.

Gorry



From owner-ipdvb@erg.abdn.ac.uk Fri Dec 01 14:59:21 2006
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From: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
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Subject: [Fwd: ULE-Sec-REQ- interim version update] -05a
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This is a multi-part message in MIME format.
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Dear all,

The authors have agreed to do an interim edit of this document, to 
reflect the discussions on the list, and hope to publish this as an I-D 
by the end of next week. I have uploaded this latest "edit" of the 
security draft from the authors to the WG web site. This includes 
repsonses to many of the issues raised during the call to adopt as a WG 
item.

If you have already made comments, or would like to do now, please check 
these links and send comments to the list.

http://www.erg.abdn.ac.uk/ip-dvb/ids/draft-cruickshank-ipdvb-sec-req-05a.txt

The html differences (from the last published rev) are also at:

http://www.erg.abdn.ac.uk/ip-dvb/ids/htmldiff_version4-5.htm


Gorry

-------- Original Message --------
Subject: 	ULE-SEc-REQ-veriosn update
Date: 	Fri, 1 Dec 2006 19:27:03 -0000
From: 	<S.Iyengar@surrey.ac.uk>
To: 	<gorry@erg.abdn.ac.uk>, <P.Pillai@Bradford.ac.uk>,
<Laurence.Duquerroy@space.alcatel.fr>, <H.Cruickshank@eim.surrey.ac.uk>
CC: 	<S.Iyengar@surrey.ac.uk>



Hi All,
Here is the version 5a and version 4 of the draft. I have also sent you
the htmldiff and the wdiff of these 2 versions. I tried to incorporate
all the comments and suggestions. Please look through them for any
comments/corrections and so.

Gorry could you please post the html stuff on some web server so that
everyone on the list can see the changes

Cheers
Sunny





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--------------060004040004040505080709--



From owner-ipdvb@erg.abdn.ac.uk Fri Dec 01 19:16:02 2006
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Subject: Ana YUN GARCIA/ES/ALCATEL is out of the office.
From: Ana.Yun_Garcia@alcatelaleniaspace.com
To: ipdvb@erg.abdn.ac.uk
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I will be out of the office starting  27/11/2006 and will not return until
06/12/2006.

I will respond to your message when I return.
For any urgent matter please contact Josep Prat.
(e-mail: josep.prat_aparicio@alcatelaleniaspace.com)





From owner-ipdvb@erg.abdn.ac.uk Thu Dec 07 10:56:10 2006
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Date: Thu, 07 Dec 2006 16:26:37 +0100
From: Michael Noisternig <mnoist@cosy.sbg.ac.at>
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Subject: Re: [Fwd: ULE-Sec-REQ- interim version update] -05a
References: <45708518.2070103@erg.abdn.ac.uk>
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Hi Sunny,

thanks for your replies to my comments and your quick document update. I 
have briefly checked the diff to the preliminary 05a revision, and I am 
fine with the changes; just one minor thing I've spotted... in the 
Summary you say
"There is an optional requirement for L2 authentication and integrity 
assurance as well as protection against insertion of other data into the 
ULE stream (i.e. data integrity)."
I think what you want to say at the end of the sentence is
"...as well as protection against insertion of old (duplicated) data 
into the ULE stream (i.e. replay protection)."

Michael

Gorry Fairhurst wrote:
> 
> Dear all,
> 
> The authors have agreed to do an interim edit of this document, to 
> reflect the discussions on the list, and hope to publish this as an I-D 
> by the end of next week. I have uploaded this latest "edit" of the 
> security draft from the authors to the WG web site. This includes 
> repsonses to many of the issues raised during the call to adopt as a WG 
> item.
> 
> If you have already made comments, or would like to do now, please check 
> these links and send comments to the list.
> 
> http://www.erg.abdn.ac.uk/ip-dvb/ids/draft-cruickshank-ipdvb-sec-req-05a.txt 
> 
> 
> The html differences (from the last published rev) are also at:
> 
> http://www.erg.abdn.ac.uk/ip-dvb/ids/htmldiff_version4-5.htm
> 
> 
> Gorry
> 
> -------- Original Message --------
> Subject:     ULE-SEc-REQ-veriosn update
> Date:     Fri, 1 Dec 2006 19:27:03 -0000
> From:     <S.Iyengar@surrey.ac.uk>
> To:     <gorry@erg.abdn.ac.uk>, <P.Pillai@Bradford.ac.uk>,
> <Laurence.Duquerroy@space.alcatel.fr>, <H.Cruickshank@eim.surrey.ac.uk>
> CC:     <S.Iyengar@surrey.ac.uk>
> 
> 
> 
> Hi All,
> Here is the version 5a and version 4 of the draft. I have also sent you
> the htmldiff and the wdiff of these 2 versions. I tried to incorporate
> all the comments and suggestions. Please look through them for any
> comments/corrections and so.
> 
> Gorry could you please post the html stuff on some web server so that
> everyone on the list can see the changes
> 
> Cheers
> Sunny
> 
> 
> 



From owner-ipdvb@erg.abdn.ac.uk Thu Dec 07 11:55:51 2006
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From: "chteh" <chteh@nrg.cs.usm.my>
To: "Ip-DVB" <ip-dvb@erg.abdn.ac.uk>
Subject: ATM over MPEG-2 TS
Date: Fri, 8 Dec 2006 00:31:50 +0800
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Hi all,

 

            Recently I have came across a document on "Digital Video
Broadcasting (DVB); Guidelines for the handling of Asynchronous Transfer
Mode (ATM) signals in DVB systems". (ETSI TR 100 815)

 

**(PLEASE correct me I am wrong)**

 

               From the document, we can see that in each MPEG-2 TS, we can
put at least 3 integral ATM cells into MPEG-2 TS payload, and after reducing
the TS header, PUSI (I assumed 3 bytes were used because of 3 integral ATM
cells), there will be 22 bytes left.

 

             We know that in AAL5 encapsulation in ATM cell, it is only
support padding mode, and section packing is not define in AAL5/ATM. But in
MPEG-2 TS, can we do section packing for ATM encapsulation over MPEG-2 TS or
it only do padding for each MPEG-2 TS packet after piping 3 integral ATM
cells? If yes, then the efficiency for ATM over MPEG-2 TS would be lower
than MPE, isn't it?

 

I'm looking forward for your reply.  Thanks for reading my mail.

 

 

Best regards,

Simon Teh

 


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<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hi all,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;
Recently I have came across a document on &#8220;Digital Video =
Broadcasting
(DVB); Guidelines for the handling of Asynchronous Transfer Mode (ATM) =
signals
in DVB systems&#8221;. (ETSI TR 100 815)<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>**(PLEASE correct me I am =
wrong)**<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
From the document, we can see that in each MPEG-2 TS, we can put at =
least 3
integral ATM cells into MPEG-2 TS payload, and after reducing the TS =
header,
PUSI (I assumed 3 bytes were used because of 3 integral ATM cells), =
there will
be 22 bytes left.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;
We know that in AAL5 encapsulation in ATM cell, it is only support =
padding
mode, and section packing is not define in AAL5/AT<st1:PersonName =
w:st=3D"on">M.</st1:PersonName>
But in MPEG-2 TS, can we do section packing for ATM encapsulation over =
MPEG-2
TS or it only do padding for each MPEG-2 TS packet after piping 3 =
integral ATM
cells? If yes, then the efficiency for ATM over MPEG-2 TS would be lower =
than
MPE, isn&#8217;t it?<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I&#8217;m looking forward for your reply. =
&nbsp;Thanks for
reading my mail.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><strong><b><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>Best =
regards,<o:p></o:p></span></font></b></strong></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Simon Teh</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

</div>

</body>

</html>

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Hi Michael,
Thanks for all your constructive comments.
=20
Cheers
Sunny
=20
=20
***********************************************************
Sunil Iyengar,
Research Fellow, Networks Group,
Centre For Communication And Systems Research(CCSR),
School of Electronics, Computing & Mathematics,
University Of Surrey, Guildford GU2 7XH,
Surrey, England, United Kingdom.
Office: +44 (0)1483 686008
***********************************************************


________________________________

From: owner-ipdvb@erg.abdn.ac.uk on behalf of Michael Noisternig
Sent: Thu 07/12/2006 15:26
To: ipdvb@erg.abdn.ac.uk
Subject: Re: [Fwd: ULE-Sec-REQ- interim version update] -05a



Hi Sunny,

thanks for your replies to my comments and your quick document update. I
have briefly checked the diff to the preliminary 05a revision, and I am
fine with the changes; just one minor thing I've spotted... in the
Summary you say
"There is an optional requirement for L2 authentication and integrity
assurance as well as protection against insertion of other data into the
ULE stream (i.e. data integrity)."
I think what you want to say at the end of the sentence is
"...as well as protection against insertion of old (duplicated) data
into the ULE stream (i.e. replay protection)."

Michael

Gorry Fairhurst wrote:
>
> Dear all,
>
> The authors have agreed to do an interim edit of this document, to
> reflect the discussions on the list, and hope to publish this as an I-D
> by the end of next week. I have uploaded this latest "edit" of the
> security draft from the authors to the WG web site. This includes
> repsonses to many of the issues raised during the call to adopt as a WG
> item.
>
> If you have already made comments, or would like to do now, please check
> these links and send comments to the list.
>
> http://www.erg.abdn.ac.uk/ip-dvb/ids/draft-cruickshank-ipdvb-sec-req-05a.=
txt
>
>
> The html differences (from the last published rev) are also at:
>
> http://www.erg.abdn.ac.uk/ip-dvb/ids/htmldiff_version4-5.htm
>
>
> Gorry
>
> -------- Original Message --------
> Subject:     ULE-SEc-REQ-veriosn update
> Date:     Fri, 1 Dec 2006 19:27:03 -0000
> From:     <S.Iyengar@surrey.ac.uk>
> To:     <gorry@erg.abdn.ac.uk>, <P.Pillai@Bradford.ac.uk>,
> <Laurence.Duquerroy@space.alcatel.fr>, <H.Cruickshank@eim.surrey.ac.uk>
> CC:     <S.Iyengar@surrey.ac.uk>
>
>
>
> Hi All,
> Here is the version 5a and version 4 of the draft. I have also sent you
> the htmldiff and the wdiff of these 2 versions. I tried to incorporate
> all the comments and suggestions. Please look through them for any
> comments/corrections and so.
>
> Gorry could you please post the html stuff on some web server so that
> everyone on the list can see the changes
>
> Cheers
> Sunny
>
>
>



------_=_NextPart_001_01C71A1F.D952136F
Content-Type: text/plain; name="msg-17667-1251.txt"
Content-Disposition: attachment; filename="msg-17667-1251.txt"
Content-Transfer-Encoding: 8bit

Hi Michael,
Thanks for all your constructive comments.
 
Cheers
Sunny
 
 
***********************************************************
Sunil Iyengar,
Research Fellow, Networks Group,
Centre For Communication And Systems Research(CCSR),
School of Electronics, Computing & Mathematics,
University Of Surrey, Guildford GU2 7XH,
Surrey, England, United Kingdom.
Office: +44 (0)1483 686008
***********************************************************


________________________________

From: owner-ipdvb@erg.abdn.ac.uk on behalf of Michael Noisternig
Sent: Thu 07/12/2006 15:26
To: ipdvb@erg.abdn.ac.uk
Subject: Re: [Fwd: ULE-Sec-REQ- interim version update] -05a



Hi Sunny,

thanks for your replies to my comments and your quick document update. I
have briefly checked the diff to the preliminary 05a revision, and I am
fine with the changes; just one minor thing I've spotted... in the
Summary you say
"There is an optional requirement for L2 authentication and integrity
assurance as well as protection against insertion of other data into the
ULE stream (i.e. data integrity)."
I think what you want to say at the end of the sentence is
"...as well as protection against insertion of old (duplicated) data
into the ULE stream (i.e. replay protection)."

Michael

Gorry Fairhurst wrote:
>
> Dear all,
>
> The authors have agreed to do an interim edit of this document, to
> reflect the discussions on the list, and hope to publish this as an I-D
> by the end of next week. I have uploaded this latest "edit" of the
> security draft from the authors to the WG web site. This includes
> repsonses to many of the issues raised during the call to adopt as a WG
> item.
>
> If you have already made comments, or would like to do now, please check
> these links and send comments to the list.
>
> http://www.erg.abdn.ac.uk/ip-dvb/ids/draft-cruickshank-ipdvb-sec-req-05a.txt
>
>
> The html differences (from the last published rev) are also at:
>
> http://www.erg.abdn.ac.uk/ip-dvb/ids/htmldiff_version4-5.htm
>
>
> Gorry
>
> -------- Original Message --------
> Subject:     ULE-SEc-REQ-veriosn update
> Date:     Fri, 1 Dec 2006 19:27:03 -0000
> From:     <S.Iyengar@surrey.ac.uk>
> To:     <gorry@erg.abdn.ac.uk>, <P.Pillai@Bradford.ac.uk>,
> <Laurence.Duquerroy@space.alcatel.fr>, <H.Cruickshank@eim.surrey.ac.uk>
> CC:     <S.Iyengar@surrey.ac.uk>
>
>
>
> Hi All,
> Here is the version 5a and version 4 of the draft. I have also sent you
> the htmldiff and the wdiff of these 2 versions. I tried to incorporate
> all the comments and suggestions. Please look through them for any
> comments/corrections and so.
>
> Gorry could you please post the html stuff on some web server so that
> everyone on the list can see the changes
>
> Cheers
> Sunny
>
>
>



------_=_NextPart_001_01C71A1F.D952136F--



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Subject: New WG Draft: draft-ietf-ipdvb-sec-req-00.txt
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A New Internet-Draft is available from the on-line Internet-Drafts
directories. This draft has now been adopted as a WG draft, and contributions
 from the working group as a whole are most welcome, as we progress this
towards publication.

Best wishes,
Gorry


This draft is a work item of the IP over DVB Working Group of the IETF.

	Title		: Security requirements for the Unidirectional Lightweight
Encapsulation (ULE) protocol
	Author(s)	: H. Cruickshank, et al.
	Filename	: draft-ietf-ipdvb-sec-req-00.txt
	Pages		: 22
	Date		: 2006-12-8

The MPEG-2 standard defined by ISO 13818-1 [ISO-MPEG2] supports a
       range of transmission methods for a range of services. This
       document provides a threat analysis and derives the security
       requirements when using the Transport Stream, TS, to support an
       Internet network-layer using Unidirectional Lightweight
       Encapsulation (ULE) [RFC4326]. The document also provides the
       motivation for link-level security for a ULE Stream. A ULE Stream
       may be used to send IPv4 packets, IPv6 packets, and other
       Protocol Data Units (PDUs) to an arbitrarily large number of
       Receivers supporting unicast and/or multicast transmission.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-ipdvb-sec-req-00.txt

Internet-Drafts are also available by anonymous FTP. Login with the
username "anonymous" and a password of your e-mail address. After
logging in, type "cd internet-drafts" and then
"get draft-ietf-ipdvb-sec-req-00.txt".

A list of Internet-Drafts directories can be found in
http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt

Internet-Drafts can also be obtained by e-mail.

Send a message to:
	mailserv at ietf.org.
In the body type:
	"FILE /internet-drafts/draft-ietf-ipdvb-sec-req-00.txt".

NOTE:	The mail server at ietf.org can return the document in
	MIME-encoded form by using the "mpack" utility.  To use this
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	command.  To decode the response(s), you will need "munpack" or
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Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the
Internet-Draft.
<ftp://ftp.ietf.org/internet-drafts/draft-ietf-ipdvb-sec-req-00.txt>