Viewing Single Post From: Crumble (New Cipher)

Viewing Single Post From: Crumble (New Cipher)
jdege	May 21 2009, 03:19 PM
Elite member Posts: 263 Group: Admin Member #246 Joined: December 7, 2006	The size of the keyspace is meaningful only if adjacent keys produce very different ciphertexts. The goal in a modern computer-based cipher is for a single bit change in the key to result in having 50% of the bits in the output change. If adjacent keys produce similar text, if a slightly more correct key produces plaintext that is slightly more correct, then a computer can hill-climb to a solution. Take a single plaintext, and encrypt it. Then decrypt it with a key that is almost right. If the result looks almost right, then a hill-climber can attack it.
	When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.

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