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Re: [Perc] Barry Leiba's No Objection on draft-ietf-perc-private-media-framework-10: (with COMMENT)

Barry Leiba <barryleiba@computer.org> Wed, 15 May 2019 13:12 UTC

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From: Barry Leiba <barryleiba@computer.org>
Date: Wed, 15 May 2019 09:11:55 -0400
Message-ID: <CALaySJJvR=uD6sBU=HE-4S6AxLRzY=xfnmKZDt139g+qAMOwaw@mail.gmail.com>
To: "Paul E. Jones" <paulej@packetizer.com>
Cc: The IESG <iesg@ietf.org>, Nils Ohlmeier <nohlmeier@mozilla.com>, perc-chairs@ietf.org, perc@ietf.org, draft-ietf-perc-private-media-framework@ietf.org
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Subject: Re: [Perc] Barry Leiba's No Objection on draft-ietf-perc-private-media-framework-10: (with COMMENT)
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Thanks, Paul!

Barry

On Tue, May 14, 2019 at 10:45 PM Paul E. Jones <paulej@packetizer.com> wrote:
>
> Barry,
>
> Thanks for the comments.  I accepted all of the suggestions and answered the one question below (while also making changes to the text to make this clear ... or attempt to do so).
>
>
> — Section 4.1 —
> It’s not clear from the diagram or explanation, so please clarify for me: there
> one e2e key per endpoint, and every endpoint knows the key for all the other
> endpoints, yes? I think it would be worth saying this clearly and explicitly,
> either here (my preference, to set it up early) or in Section 4.5.
>
>
> There is one or more unique E2E keys per Endpoint, generally one per media flow (though the same E2E key could be used for all flows given the SSRCs are different for each). For each flow, these keys are conveyed by the sender in the full EKT Field as per the EKT Diet document.
>
> I've added some text and hopefully that will appear in the next revision. I also felt like we needed to augment 4.5 with stating (just for completeness) that normal DTLS-SRTP is used to obtain HBH keys between Media Distributors. So I added that, too.
>
> Paul
>

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