Viewing Single Post From: A New Challenge

Viewing Single Post From: A New Challenge
jdege	Aug 29 2008, 11:14 PM
Elite member Posts: 263 Group: Admin Member #246 Joined: December 7, 2006	Donald Aug 29 2008, 04:00 AM Don't feel too bad though, it's a mistake we have ALL made. Not just ignoring Kerckhoff's Principle, but designing irreversable ciphers. Yep. What, though, would it take to turn this into a reversible cipher? Not a lot. It has a number of alphabets, each of which is a multiplication+addition. If each was a multiplication+addition done modulo some third number, and was expressed in a constant number of digits, it'd be reversible. That is, if the number of digits in each alphabet was part of the key, we'd have a reversible cipher. Of course, once we had that, we'd have a cipher that was pretty easy to break.
	When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.

A New Challenge · Challenges