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Re: IVs, summary of discussion
>From ipsec-request@ans.net Wed Aug 31 08:40:34 1994
> You have made a good point of why an application such a
>broadcast packet video may be one where the use of a stream cipher is
>critical for performance. If the cipher has good error propogation
>qualities, then the criteria I noted above is met. Alternatively, if
>this packet format and compression algorithm are presumed to be immune
>to effective, real-time manipulation by an attacker with an ability to
>modify individual bits of the underlying plaintext in a controlled
>fashion, then you're OK anyway.
Yes, I think we are in agreement. I want to be able to use
a stream cipher, which has no error propagation, for encrypted
video and I dont want to have to compute separate integrity checks
like one-way hash functions, for precisely the reason you cite
above.
Ashar.