Re: RC5 slower than DES ?

Hamdi Tounsi (hamdi.tounsi@ati.tn)
Thu, 12 Feb 1998 09:39:46 +0100

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Eric Young wrote:
>
> On Wed, 11 Feb 1998, Hamdi Tounsi wrote:
> > when benchmarking des and rc5 with the distributed.net client, i noticed
> > that rc5 multiple encryptions with different keys runs at 1/3 the speed
> > of DES.
> > rc5 is much more simpler than des, so it must be the key sheduling for
> > rc5 which is slower than des
> > someone can benchmark separately the key sheduling and encryption ?
>
> If they are doing multiple key rc5, what does this mean?
> Is this 'tripple rc5' or some such construct? The rc5 key setup is about
> 2 times as expensive as DES but is basically not bad.
>
> As for RC5 the cipher, it screams.
> So, unless they are doing triple RC5, it should definitly be faster.

Well, multiple rc5 encryptions at distributed.net mean that they r
brute-forcing a key, that's why key scheduling is crucial for
performance.
the client i tried was v2.7011 for win32/intel, u can found it at
www.distributed.net
i guess u can help them to speedup cracking ;))

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