RE: [Simple] IMDN Issue 5: Changing an end-to-end signed message/cpim IM

I would offer that end-to-end signed messages work: they prove the B2BUA
changed the message in the middle.

What if the message is end-to-end encrypted?  Then the whole thing blows
up.

Is this a bug or feature of CPIM?

-----Original Message-----
From: Hisham Khartabil [mailto:hisham.khartabil@telio.no] 
Sent: Wednesday, August 02, 2006 4:50 AM
To: 'simple@ietf.org' WG
Cc: Miguel Garcia
Subject: [Simple] IMDN Issue 5: Changing an end-to-end signed
message/cpim IM

"   An intermediary that forwards an IM MAY change the recipient address
    in the CPIM To header field when forwarding (for example, a URI-List
    server changes the IM Recipient address from its own to the address
    of the final recipient of that IM for every copy it makes to be sent
    to the list members).  In this case, the intermediary MUST add an
    Original-To header field to the IM "

The problem is how to we handle message/cpim messages that are signed 
end to end?

I remember in earlier conversation with Miguel, I suggested to him 
covering the message/cpim case in his draft in sipping 
(draft-ietf-sipping-uri-list-message-07.txt). I believe this issue 
should be handled in that draft. Of course the same issue applies here 
since we are adding the Original-To header to the message/cpim part of 
the message.

Any comments?

Regards,
Hisham

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