Re: [MMUSIC] Bundling data channel and RTP? - Text proposal

Martin Thomson <martin.thomson@gmail.com> Thu, 28 May 2015 23:06 UTC

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Date: Thu, 28 May 2015 16:06:35 -0700
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From: Martin Thomson <martin.thomson@gmail.com>
To: Roman Shpount <roman@telurix.com>
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>, "pkyzivat@alum.mit.edu" <pkyzivat@alum.mit.edu>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [MMUSIC] Bundling data channel and RTP? - Text proposal
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On 28 May 2015 at 16:01, Roman Shpount <roman@telurix.com> wrote:
> I am not the member of TLS working group and TLS 1.3 is still fairly early
> to completely specify how it operates. In particular, it does not include
> any mechanism for key material update. I am not 100% sure what is going to
> be supported there and if extensions can be added and removed for an
> existing DTLS session.

I expect that TLS 1.3 will specify a rekeying mechanism, but only for
its own records (in this context, that means SCTP).  Things that
depend on exporters (like DTLS-SRTP) will likely get a single, stable
value.

I agree with your analysis regarding use_srtp.  We certainly behave that way.