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

Magnus Westerlund <magnus.westerlund@ericsson.com> Tue, 02 June 2015 09:24 UTC

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Date: Tue, 2 Jun 2015 11:24:53 +0200
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: Martin Thomson <martin.thomson@gmail.com>, Roman Shpount <roman@telurix.com>
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Subject: Re: [MMUSIC] Bundling data channel and RTP? - Text proposal
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Martin Thomson skrev den 2015-05-29 01:06:
> 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.
>

Okay, this is outside of the topic of the recommendation and bundle.

Having no way of renegotiating the SRTP and SRTCP keys will be an issue 
for long-lived RTP sessions.

It may also be an important consideration for how the key-management is 
done in End-to-End secure conferencing work in PERC. Because if one is 
to ensure that only the current group of participants can decode the 
media, then one will have to re-key on each change to the group of 
participants.

Cheers

Magnus Westerlund

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