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Block cipher From Wikipedia, the free encyclopedia
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.
General | |
---|---|
Designers | Nakahara, Rijmen, Preneel, Vandewalle |
First published | 2002 |
Derived from | IDEA |
Cipher detail | |
Key sizes | 128, 192, or 256 bits |
Block sizes | 64, 96, or 128 bits |
Structure | Lai–Massey scheme |
Rounds | 8.5, 10.5, or 12.5 |
Best public cryptanalysis | |
2 rounds can be broken using 128, 161, or 225 known plaintexts |
MESH is actually a family of 3 variant ciphers with block sizes of 64, 96, and 128 bits.[1] 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 Lai–Massey scheme 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.
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