Columbia crypto box
Pete Chown
Pete.Chown at skygate.co.uk
Thu Feb 13 05:20:19 EST 2003
Arnold G. Reinhold wrote:
> Indeed, but it is important to remember just how thickheaded the
> anti-crypto effort of the '80s and '90s was and how much damage it did.
As a footnote to those times, 2 ** 40 is 1,099,511,627,776. My PC can
do 3,400,000 DES encryptions per second (according to openssl). I
believe DES key setup is around the same cost as one encryption, so we
should halve this if a different key is being used each time. Brute
force of a 40-bit DES key will therefore take about a week. In other
words 40-bit DES encryption is virtually useless, as brute force would
be available to anyone with a modern PC.
--
Pete
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