Zodiac (cipher)

Zodiac (Cipher)

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Zodiac (cipher)

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In cryptography, Zodiac is a block cipher designed in 2000 by Chang-Hyi Lee for the Korean firm SoftForum.

Zodiac uses a 16-round Feistel network structure with key whitening. The round function uses only XORs and S-box lookups. There are two 8&times;8-bit S-boxes: one based on the discrete exponentiation 45<sup>x</sup> as in SAFER, the other using the multiplicative inverse in the finite field GF(2<sup>8</sup>), as introduced by SHARK.

Zodiac is theoretically vulnerable to impossible differential cryptanalysis, which can recover a 128-bit key in 2<sup>119</sup> encryptions.


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