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In cryptography, MMB (Modular Multiplication-based Block cipher) is a block cipher designed by Joan Daemen as an improved replacement for the IDEA cipher.[3] Modular multiplication is the central element in the design. Weaknesses in the key schedule were identified by Eli Biham, and this, together with the cipher's not having been designed to resist linear cryptanalysis, meant that other designs were pursued instead, such as 3-Way.

Designers Joan Daemen
First published 1993
Derived from IDEA
Successors ABC
Cipher detail
Key sizes 128 bits
Block sizes 128 bits
Structure Substitution-permutation network[1]
Rounds 6
Best public cryptanalysis
Key recovery using 267 chosen plaintexts[2]

MMB has a key size and block size of 128 bits.


  1. ^ Slide 4[dead link]
  2. ^ K. Jia and J. Chen and M. Wang and X. Wang (2010), Practical-time Attack on the Full MMB Block Cipher (PDF), retrieved 2010-04-24
  3. ^ Joan Daemen, René Govaerts, Joos Vandewalle (1993). "Block Ciphers Based on Modular Arithmetic" (PDF/PostScript). Proceedings of the 3rd Symposium on: State and Progress of Research in Cryptography. Fondazione Ugo Bordoni. pp. 80&ndash, 89. Retrieved 2007-02-14.

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