Editing MMB (cipher)

{{Short description|Block cipher}}
{{Infobox block cipher
| name          = MMB
| designers     = [[Joan Daemen]]
| publish date  = 1993
| derived from  = [[International Data Encryption Algorithm|IDEA]]
| derived to    = [[ABC (block cipher)|ABC]]
| related to    =
| key size      = 128 bits
| block size    = 128 bits
| structure     = [[Substitution–permutation network]]<ref>[http://sac.ucalgary.ca/sites/sac.math.ucalgary.ca/files/u5/16_MMB_block.pdf Slide 4] {{Dead link|date=February 2016}}</ref>
| rounds        = 6
| cryptanalysis = Key recovery using 2<sup>67</sup> [[Chosen-plaintext attack|chosen plaintexts]]<ref>{{citation
    | author = K. Jia and J. Chen and M. Wang and X. Wang
    | title = Practical-time Attack on the Full MMB Block Cipher
    | year = 2010
    | url = https://eprint.iacr.org/2010/211/
    | format = PDF
    | access-date = 2010-04-24 }}</ref>
}}

In [[cryptography]], '''MMB''' ('''Modular Multiplication-based Block cipher''') is a [[block cipher]] designed by [[Joan Daemen]] as an improved replacement for the [[IDEA (cipher)|IDEA]] cipher.<ref>{{cite conference
    |author=Joan Daemen |author2=René Govaerts |author3=Joos Vandewalle
    | title = Block Ciphers Based on Modular Arithmetic
    | book-title = Proceedings of the 3rd Symposium on: State and Progress of Research in Cryptography
    | pages = 80&ndash;89
    | publisher = [[Fondazione Ugo Bordoni]]
    | date = 1993
    | citeseerx = 10.1.1.52.2614
 }}</ref> [[Modular arithmetic|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 (cryptography)|block size]] of 128 bits.

==References==
<references/>

* {{cite conference
    |author1=M. Wang |author2=J. Nakahara |author3=Y. Sun  |name-list-style=amp | title =  Cryptanalysis of the Full MMB Block Cipher
    | book-title = Selected Areas in Cryptography 2009
    | pages = 231–248
    | publisher = Springer-Verlag
    | date = 2009
    | url = http://www.springerlink.com/content/m237575u6l853011/
    | archive-url = https://archive.today/20130203011434/http://www.springerlink.com/content/m237575u6l853011/
    
    | archive-date = 2013-02-03
    | format = PDF
    | access-date = 2010-04-24 }}

==External links==
* [https://web.archive.org/web/20180131171313/http://www.ussrback.com/crypto/libraries/mmb/mmb.txt Paulo Barreto's comments on MMB]
* [https://www.esat.kuleuven.be/cosic/publications/thesis-6.pdf Daemen's PhD thesis] (The specification of MMB appears in section 11.5)

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[[Category:Broken block ciphers]]


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