[RC5] AES (was: I think we found our next contest...)

Martin Schroeder martin at oneiros.de
Fri Dec 14 11:42:35 EST 2001

On 2001-12-13 14:07:41 -0600, Aaron W. Swenson wrote:
> And yeah, AES might take to long, but it won't be long before we can crack 
> that code in 22 hours as well (under ten years.)  I haven't seen anybody 

<quote src=http://csrc.nist.gov/encryption/aes/aesfact.html>
18.Approximately how big are the AES key sizes?

      The AES will specify three key sizes: 128, 192 and 256
bits. In decimal terms, this means that there are approximately:

            3.4 x 10^38 possible 128-bit keys;

            6.2 x 10^57 possible 192-bit keys; and

            1.1 x 10^77 possible 256-bit keys.

      In comparison, DES keys are 56 bits long, which means there
are approximately 7.2 x 10^16 possible DES keys. Thus, there are
on the order of 10^21 times more AES 128-bit keys than DES 56-bit

So you would need a speed increase of dnetc of 10^21. Even if the
speed of dnet doubled every month, this would still take longer
than this universe lasts.

Best regards
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