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Twofish encryption algorithm

Twofish is a symmetric key block cipher with a block size of 128 bits and key sizes up to 256 bits. It was one of the five finalists of the AES contest, but was not selected for standardisation.

Twofish's distinctive features are the use of pre-computed key-dependent S-boxes, and a relatively complex key schedule. On most software platforms Twofish is slightly slower than AES for 128-bit keys, but somewhat faster for 256-bit keys.

As of Sept. 2002 there is no known attack on Twofish more efficient than brute force key search.


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