Re: [Sip] RFC 4474 and SBC traversal

[Eric Rescorla <ekr at networkresonance.com>]

At Fri, 04 Apr 2008 11:50:53 +0300,
Hannes Tschofenig wrote:
> 
> This issue is totally independent from E.164
> 
> I don't like the idea of requiring DTLS-SRTP to provide proof of 
> possession of the keying material.

To be honest, I'm not even sure what this means. DTLS-SRTP inherently
provides a proof that the peer you're encrypting to has keying
material that matches whatever was in the fingerprint. That's
a distinct question from whether the fingerprint is cryptographically
bound to the message.

-Ekr


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