[RC5] RC5-64 HAS BEEN SOLVED

Jason Hartzell jhartzell at arcataassoc.com
Fri Sep 27 10:40:11 EDT 2002


> 
> We needed nearly 5 years for rc5-64.
> If time needed decreases by a factor of 5 we would need 256 years to solve
it.
> 

Just because CSC, RC5-64 and the last DES challenge went through such a
large percentage of the keyspace doesn't mean RC5-72 will. It could be ANY
key. As unlikely as it may be, it is very possible that RC5-72 could be done
before the end of this year (provided clients are out before the end of this
year). To make a direct comparision just seems absurd. There is no reason to
believe that it will take the EXACT same percentage of the keyspace to find
RC5-72, or RC5-80, or RC5-128. 
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