MESH (cipher)

MESH (cipher)

Infobox block cipher
name = MESH
designers = Nakahara, Rijmen, Preneel, Vandewalle
publish date = 2002
derived from = IDEA
key size = 128, 192, or 256 bits
block size = 64, 96, or 128 bits
structure = Substitution-permutation network
rounds = 8.5, 10.5, or 12.5
cryptanalysis = 2 rounds can be broken using 128, 161, or 225 known plaintexts

In cryptography, MESH is a block cipher designed in 2002 by Jorge Nakahara, Jr., Vincent Rijmen, Bart Preneel, and Joos Vandewalle. MESH is based directly on IDEA and uses the same basic operations.

MESH is actually a family of 3 variant ciphers with block sizes of 64, 96, and 128 bits. The key size is twice the block size. The number of rounds is 8.5, 10.5, or 12.5, depending on the block size. The algorithm uses a substitution-permutation network based on IDEA's, but with a larger round structure, or "MA-box". MESH also has a more complex key schedule than IDEA, intended to prevent weak keys and other insecure patterns in subkeys.

References

* cite paper
author = J. Nakahara, Jr, V. Rijmen, B. Preneel, J. Vandewalle
title = The MESH Block Ciphers
date = 2002
url = http://citeseer.ist.psu.edu/nakahara02mesh.html
format = PDF/PostScript
accessdate = 2007-02-08
* cite paper
author = J. Nakahara Jr., B. Preneel, and J. Vandewalle
title = The Biryukov-Demirci Attack on IDEA and MESH Ciphers
date = 2003
url = http://citeseer.ist.psu.edu/600837.html
format = PDF/PostScript
accessdate = 2007-10-04


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