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In cryptography, MUGI is a pseudorandom number generator designed for use as a stream cipher. It has been recommended for Japanese government use by the CRYPTREC project.
MUGI takes a 128-bit secret key and a 128-bit initial vector. After a key- and IV- setup process, MUGI outputs 64-bit output strings based on the internal state, while updating the internal state after each output block. MUGI has a 1216-bit internal state; there are three 64-bit registers and 16 64-bit registers.
MUGI uses the non-linear S-box that was originally defined in Advanced Encryption Standard. A part of the linear transformation also reuses the MDS matrix of AES. The basic design is influenced by that of Panama.
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