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Serpent (cipher) - Definition |
| Related Words: Greek, X, Add, Allegory, Argot, Autograph, Bit, Break, Calculate, Cant, Cast, Character, Code |
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Serpent is a symmetric key block cipher which was a finalist in the Advanced Encryption Standard contest, where it came second to Rijndael. Serpent was designed by Ross Anderson, Eli Biham, and Lars Knudsen.
Like other AES submissions, Serpent has a block size of 128 bits and supports a key size of 128, 192 or 256 bits. The cipher is a 32-round substitution-permutation network operating on a block of four 32-bit words. Each round uses 32 copies of the same 4-bit to 4-bit S-box. Serpent was designed so that all operations can be executed in parallel, using 32 1-bit slices. This maximises parallelism, but also makes use of the extensive cryptanalysis work performed on DES.
Serpent was widely viewed as taking a more conservative approach to security than the other AES finalists, opting for a larger security margin: the designers deemed 16 rounds to be sufficient against known types of attack, but specified 32 rounds as insurance against future discoveries in cryptanalysis.
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Example Usage of (cipher) |
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cipher: 内村のあれはなくなるだろうな 冬の富士「強風、ヒマラヤ並みに危険」 片山さんら遭難 - 社会 http://bit.ly/7JA1I9 |
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cipher: キョーモイイテンキー（棒読み） |
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Privilegedkid: We're about to make our departure to the studio. Tune in and check out the cipher http://bit.ly/78EKrl . im gettin anxious.... |
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