M8 (cipher)

M8 (cipher)

Infobox block cipher
name = M8
designers = Hitachi
publish date = 1999
derived from = M6
derived to =
related to =
key size =
block size = 64 bits
structure = Feistel network
rounds = 10
cryptanalysis =
In cryptography, M8 is a block cipher designed by Hitachi in 1999. It is a modification of Hitachi's earlier M6 algorithm, designed for greater security and high performance in both hardware and 32-bit software implementations.

Like M6, M8 is a 10-round Feistel cipher with a block size of 64 bits. The round function can include bit rotations, XORs, and modular addition, but the structure of each round function used is determined by the key. Making these variations key-dependent is intended to make cryptanalysis more difficult (see FROG for a similar design philosophy).

References

* [http://www.isg.rhul.ac.uk/~cjm/ISO-register/0020.pdf ISO/IEC9979-0020 Register Entry (PDF)] , registered March 19 1999


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