[RC5] I think we found our next contest...

Aaron W. Swenson aswenson at frontiernet.net
Fri Dec 14 08:53:00 EST 2001


I realize that Intel and AMD aren't the only CPU manufacturers, and that 
there have been 64bit processors for a while now.  However, the point I was 
trying to make, was that it wouldn't be long before 64bit processing makes 
it to Joe Sixpack.

At 05:38 PM 12/13/2001 -0600, you wrote:

>On Thu, 13 Dec 2001, 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
> > mention the 64bit processor development.  Intel already has 64bit
> > processors, and AMD is developing theirs and should have some available by
> > 2003.  Of course Intel's 64bit processors are aimed at the server market,
> > however, AMD's is aimed at the home market.
>
>Dnet has had cores for 64-bit processors for years now... Intel and AMD
>aren't the only CPU makers, ya know :) Alpha, SPARC, and MIPS, for
>example, have 64-bit processors. Still, I don't see that we'll be able
>to brute force AES any time soon. Computing power might double every 18
>months or so, but AES has 4722366482869645213696 times the keys compared
>to DES (and isn't there some quirk of DES that makes it fast to encrypt
>with a key and its complement at the same time?). It'll take 108 years
>for computing power to increase the same number of times. (And I suspect
>the number of keys/second for AES is much lower than the number of
>keys/second for DES on the same processor, so that'll make things take
>even longer).
>
> > I've herd the Dnet staff make mention about 64bit encryption fitting nicely
> > into two 32bit registers.  Correct me if I'm wrong, AES is a 128bit
> > encryption process, so it should fit nicely into two 64bit registers.
>
>That's just a programming convenience... it's still going to take
>forever, even if it does "fit nicely".
>
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