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Title: Mmb  
Author: World Heritage Encyclopedia
Language: English
Subject: WikiProject Cryptography, International Data Encryption Algorithm, Joan Daemen, Cobra ciphers, Xor-encrypt-xor
Collection: Broken Block Ciphers
Publisher: World Heritage Encyclopedia


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]

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.

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


  1. ^ Slide 4
  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. ^ J. Daemen, R. Govaerts, and  
  • M. Wang, J. Nakahara, and Y. Sun (2009). "Cryptanalysis of the Full MMB Block Cipher" (PDF). Selected Areas in Cryptography 2009. Springer-Verlag. pp. 231–248. Retrieved 2010-04-24. 

External links

  • Paulo Barreto's comments on MMB
  • Chapter of Daemen's PhD thesis dealing with MMB (Postscript format) (The specification of MMB appears in section 11.5

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