Re: [AVT] RFC 3711 - keystream prefix

[Mats Na"slund <mats.naslund at ericsson.com>]

Hi

Ofer Goren wrote:

> Hi.
>
> Thanks for your quick answer.
> so can I assume that the length of the keystream prefix has no impact on 
> the length of the authentication tag or the length of the packet?

Right. You could infact say that the tag length defines the prefix length.

With the currently defined transforms in SRTP, the tag length and MKI
length are the only "paramaters" that can effect the packet length.
(I say "currently defined", becuase somebody might in the future use
SRTP with a transform that requires extra padding, e.g. CBC encryption.)

/Mats



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