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Re: DES-XEX3 was: A little social engineering

Uri Blumenthal writes:
> William Allen Simpson says:
> > My memory (from Schneier, Byte, and CryptoBytes) is that this extends
> > the DES 56-bits key strength up to about 120-bits for brute-force, and
> > boosts the chosen plaintexts from 2**47 to 2**60 for differential.
> If *my* memory serves me, DESX increases the key length against brute
> force, but has no effect wrt. differential or linear attack.

That would make sense.