Re: [AVTCORE] FYI: draft-rescorla-random-cname-00

On Wed, Jul 11, 2012 at 5:00 AM, Colin Perkins <csp <at> csperkins.org> wrote:
> [limiting replies to avt, since this is about details]
>
> On 9 Jul 2012, at 20:24, Eric Rescorla wrote:
>> As discussed at the RTCWEB interim:
>>
>> Executive summary: use a CSPRNG to generate CNAMEs.
>
>
> Section 2.1 says: "The timestamp (from the RTP header) to within a few seconds.  With a typical 100
ticks/second clock, this represents about 10 bits of entropy at most (and potentially more like 2-3
bits)". The RTP timestamp has a random initial value, and typically ticks at either 8kHz or 90kHz. It's not
a wall clock. There's more entropy here than supposed.

Sorry, RTCP NTP timestamp.

-Ekr
_______________________________________________
Audio/Video Transport Core Maintenance
avt <at> ietf.org
https://www.ietf.org/mailman/listinfo/avt