Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
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Re: DES doubts. why we use 56 bit key when ony 48 bits are used?

From: <fermisoft@gmail.com>
Date: Thu Dec 29 2005 - 11:22:36 CET




One more doubt. Why the first and last permutations in a round are


susceptible to the attack?  In most of the DES crypto analysis, they


are simply ignoring the first and last permutations. Why is this?


Received on Tue Jan  3 03:41:44 2006