Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
 From: fermisoft@xxxxxxxxx
 Date: 29 Dec 2005 02:22:36 0800
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?
.
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