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Re: [Perc] Magnus Westerlund's Discuss on draft-ietf-perc-private-media-framework-10: (with DISCUSS and COMMENT)

Cullen Jennings <fluffy@iii.ca> Fri, 17 May 2019 18:24 UTC

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From: Cullen Jennings <fluffy@iii.ca>
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Date: Fri, 17 May 2019 12:24:08 -0600
Cc: Paul Jones <paulej@packetizer.com>, The IESG <iesg@ietf.org>, "nohlmeier@mozilla.com" <nohlmeier@mozilla.com>, "perc-chairs@ietf.org" <perc-chairs@ietf.org>, "perc@ietf.org" <perc@ietf.org>, "draft-ietf-perc-private-media-framework@ietf.org" <draft-ietf-perc-private-media-framework@ietf.org>
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To: Magnus Westerlund <magnus.westerlund@ericsson.com>
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Subject: Re: [Perc] Magnus Westerlund's Discuss on draft-ietf-perc-private-media-framework-10: (with DISCUSS and COMMENT)
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> On May 17, 2019, at 8:22 AM, Magnus Westerlund <magnus.westerlund@ericsson.com> wrote:
> 
>  So far only a single SRTP cipher suits defined provides source authentication properties that allow an endpoint to cryptographically assert that it sent a particular E2E protected packet. Instead, the common property is that one can determine only that any endpoint that has received the KEK has produced the packet.

Magnus, I’m just a bit confused on what the above two senses are trying to say - can you just expand it out a bit more so I get it. I think I am struggling with what cipher you refer to in the first sentense.

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