[RC5] AES (was: I think we found our next contest...)
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
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.
To unsubscribe, send 'unsubscribe rc5' to majordomo at lists.distributed.net
rc5-digest subscribers replace rc5 with rc5-digest
More information about the rc5