High Quality Content by WIKIPEDIA articles! In cryptography, CIPHERUNICORN-E is a block cipher created by NEC in 1998. It is among the cryptographic techniques recommended for Japanese government use by CRYPTREC. The algorithm has a 16-round modified Feistel network structure, with an additional key-dependent mixing function after every 2 rounds. The block size is 64 bits, and the key size 128 bits. The round function is fairly complicated, split into two nearly parallel computations. The first part (called the main stream by the designers) consists of XORs and S-box lookups, with a few choices influenced by the second part. This second function (called temporary key generation) uses more XORs and two operations which are equivalent to modular multiplications. Subkeys are added at various stages of both parts of the round function. There are 4 S-boxes in all, each with 8-bit inputs and outputs.

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