Re: [AVT] SRTP question

[Mark Baugher <mbaugher at cisco.com>]

Steffen
  I think Karl wrote that section so I am copying him on my reply and he 
can correct me if I'm wrong:  The key length is there for the sole purpose 
of illustrating key derivation and doe not imply that  94 octet key is to 
be used for HMAC-SHA1.

regards, Mark
At 08:28 AM 7/12/2004, Steffen Fries wrote:
> Hi,
>
> I've got a question to the authentication key length in SRTP.
> RFC3711 describes the authentication function and the
> authentication key length within section 4.2 and the key
> derivation within section 4.3.
> Within section 8.2 the values for a SRTP policy are stated. For
> the session authentication key a default length of 160 bits is
> pointed out. Later in the key derivation test vector section B.3
> the authentication key length is mentioned with 94 octets.
>
> What is the reason for the length differences?
>
> Steffen
>
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