[rc5] 56 bits seem to be enough

Michael Bruck micha at tecnet.de
Thu Jun 5 15:24:39 EDT 1997

What do you think the CIA or whoever else is doing right now to crack
56 bit keys ? They probably don't start a distributed attack with
all their PC/Workstations they have. They design some custom chips
only for the RC5 algorithm that are *much* faster than a PPro at
this job. With some thousands of these they make up a massively 
parallel computer. It takes only some hours for such a machine
to crack the key. This all is just a matter of how much money you 
have. There was a paper somewhere about DES with the same approach
and that discussed the design for these chips and the costs for
the complete machine. 

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