[RC5] Cycles per key

Coopmans, Harry h.coopmans at ftr.nl
Mon Sep 30 13:24:15 EDT 2002


Probably the number of cycles per key is almost the same. The only problem
is that RC5-72 has 256 as many keys as RC5-64, so it will take a lot longer.
At maximum speed, it would take us now about 1000 days to check the entire
rc5-64 keyspace. To do the complete RC5-72 keyspace it will take 256000 at
the present speed. 
If the RC5 computing power increases 50 percent each year it will take
almost 15 years to do the entire keyspace (and almost 13 to do half of the
keyspace). If RC5 speed doubles each year (optimist?), it will take almost
10 years to check the entire keyspace. That's quite a long time.

Kind regards,
Harry

-----Oorspronkelijk bericht-----
Van: Jeroen [mailto:v.d.burg at planet.nl]
Verzonden: Monday, September 30, 2002 12:04 PM
Aan: rc5 at lists.distributed.net
Onderwerp: [RC5] Cycles per key


Hi

Just curios, how many cycles does it cost to process one RC5-64 key?
And how much for a RC5-72 key on the moment?


Jeroen


--
To unsubscribe, send 'unsubscribe rc5' to majordomo at lists.distributed.net
rc5-digest subscribers replace rc5 with rc5-digest
--
To unsubscribe, send 'unsubscribe rc5' to majordomo at lists.distributed.net
rc5-digest subscribers replace rc5 with rc5-digest



More information about the rc5 mailing list