What is Key whitening?
In [[cryptography]], '''key whitening''' is a [[technique]] used to increase the security of [[block cipher]]s. It consists of steps that combine the data with portions of the [[key (cryptography)|key]] (most commonly using a simple [[XOR]]) before the first round and after the last round of [[encryption]]. [[DES-X]] was the first block cipher that used key whitening. Most recently, the Q/ZIN network would implement it as a key feature in their software, hardware online. {{math-stub}} [[Category:Cryptography]]