| General | |
|---|---|
| Designers | Dai Watanabe, Soichi Furuya, Kazuo Takaragi, Bart Preneel |
| First published | February 2002 |
| Derived from | Panama |
| Certification | CRYPTREC (Candidate) |
| Cipher detail | |
| Key sizes | 128 bits |
| State size | 1216 bits |
| Rounds | 32 |
In cryptography, MUGI is a pseudorandom number generator (PRNG) designed for use as a stream cipher. It was among the cryptographic techniques recommended for Japanese government use by CRYPTREC in 2003, however, has been dropped to "candidate" by CRYPTREC revision in 2013.
MUGI takes a 128-bit secret key and a 128-bit initial vector (IV). 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 (the "state") and 16 64-bit registers (the "buffer").
MUGI uses the non-linear S-box that was originally defined in Advanced Encryption Standard (AES). A part of the linear transformation also reuses the MDS matrix of AES. The basic design is influenced by that of Panama.