Key whitening
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In cryptography, key whitening is a technique intended to increase the security of an iterated block cipher. It consists of steps that combine the data with portions of the key.
Details
The most common form of key whitening is
XOR before the first round and after the last round of encryption
.
The first block cipher to use a form of key whitening is
brute force attack, increasing the effective size of the key without major changes in the algorithm. DES-X's inventor, Ron Rivest
, named the technique whitening.
The cipher
.See also
References
- ISBN 0-471-11709-9.