NODE af0d8009RE: No Subject
"Harvey Rook (Exchange)" <hrook@exchange.microsoft.com>Wed, 28 Oct 1998 09:26:04 +0800
> More interesting, though, is this: why would a block cipher
> use key bits
> rather than an LFSR to do input or output whitening? Is it strictly a
> performance issue? Is it proven that doing this doesn't leak
> key bits in
> some way?
>
> Mike
>
In many newer block ciphers, the key schedule comes from a fairly good one
way hash of the key. Take a look at RC6, or TwoFish. Essentially this
accomplishes the same thing as using a good LSFR.
Harv.