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On Wed, 20 Dec 2000, Henry Spencer wrote:
> On Wed, 20 Dec 2000, Gisle S{lensminde wrote:
> > I have no idea why Rijndael and AES is assigned different numbers, since
> > Rijndael simply is the winner algorithm of the AES competition...
>
> If memory serves, Rijndael has more options -- for things like key size --
> than AES permits, so it is technically more accurate to say that AES is a
> (slight) subset of Rijndael.
This is right. AFAIK, AES is required to be a 128-bit, 192-bit, or
256-bit and Rijndael is a variable-sized cipher. From the Rijndael
homepage:
"The cipher has a variable block length and key length. We currently
specified how to use keys with a length of 128, 192, or 256 bits to
encrypt blocks with al length of 128, 192 or 256 bits (all nine
combinations of key length and block length are possible). Both block
length and key length can be extended very easily to multiples of 32
bits. Rijndael can be implemented very efficiently on a wide range of
processors and in hardware."
So to be AES compliant, it must must use one of the pre-set sizes. But
the algorithim itself is capabible of using many others (32bit multiples).
Cheers,
Ryan
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Ryan W. Maple "I dunno, I dream in Perl sometimes..." -LW
Guardian Digital, Inc. ryan@xxxxxxxxxxxxxxxxxxx
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Linux-crypto: cryptography in and on the Linux system
Archive: http://mail.nl.linux.org/linux-crypto/
