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Re: [Perc] Question on diet Design?

Eric Rescorla <ekr@rtfm.com> Thu, 23 March 2017 11:13 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Thu, 23 Mar 2017 04:12:51 -0700
Message-ID: <CABcZeBNFbpAKu-PkuB+zxxpduJStViJX=_xZD5s7R4ejCMx5FA@mail.gmail.com>
To: "Paul E. Jones" <paulej@packetizer.com>
Cc: perc@ietf.org
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Subject: Re: [Perc] Question on diet Design?
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It's part of the SRTP KDF.

-Ekr


On Wed, Mar 22, 2017 at 9:42 PM, Paul E. Jones <paulej@packetizer.com>
wrote:

> Eric,
>
> I think what you propose would work, but each stream from a given endpoint
>> would need to have a unique key since we do not want the any two media
>> flows using the same key. Thus, I think we'd need:
>>   KDF(K_g, ID || stream_id)
>>
>
> The SSRC addresses that, no?
>
>
> Yeah, SSRC is fine for that.  We just need to ensure it is a part of the
> KDF input.
>
> Paul
>

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