Re: [AVT] SRTP question

["Steffen Fries" <steffen.fries at siemens.com>]

Hi Mark,

thanks for the answer. 

So, that was actually may guess, but I wanted to make sure that 
I didn't miss anything.

Regards
	Steffen


Date sent:      	Mon, 12 Jul 2004 11:35:46 -0700
To:             	steffen.fries at siemens.com
From:           	Mark Baugher <mbaugher at cisco.com>
Subject:        	Re: [AVT] SRTP question
Copies to:      	avt at ietf.org, karl.norrman at ericsson.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
> >
> >_______________________________________________
> >Audio/Video Transport Working Group
> >avt at ietf.org
> >https://www1.ietf.org/mailman/listinfo/avt
> 
> 
> 



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