[RC5] Block times : an explanation
rguyom at mail.dotcom.fr
Thu Jan 15 00:16:31 EST 1998
> My dx2/66 did an rc5 block in about 1:10 mins averaging about 63kkeys/sec.
> Now with DES stuff it does about 126kkeys/sec with a block size of 2^28
> it takes well...lets just say I havnt gotten through a block yet and its
> been well over 2 hours.
> is this right? My cyrix 166+ does over 480kkeys/sec w/block of 2^28 and
> it still crunches through a block about 3 mins slower than an rc5 one.
> Whats up with that?
Ok, here's an explanation :
On DES, testing a key and its complement is faster than testing each key
separately. Clients test all keys in a block *AND* their corresponding
complementary keys. When you have completed a 2^28 sized block, you have
checked 2^29 keys.
RÈmi Don't waste your computer's time. Distribute it!
RC5 cores source code : http://wwwperso.hol.fr/~guyom001/
To unsubcribe, send 'unsubscribe rc5' to majordomo at lists.distributed.net
rc5-digest subscribers replace rc5 with rc5-digest
More information about the rc5