Threefish
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| General | |
|---|---|
| Designers | Bruce Schneier, Niels Ferguson, Stefan Lucks, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, Jesse Walker |
| First published | 2008 |
| Related to | Blowfish, Twofish |
| Cipher detail | |
| Key sizes | 256, 512 or 1024 bits (key size is equal to block size) |
| Block sizes | 256, 512 or 1024 bits |
| Rounds | 72 (80 for 1024-bit block size) |
| Speed | 6.1 cpb on Core 2. |
Threefish is a symmetric-key tweakable block cipher designed as part of the Skein hash function, an entry in the NIST hash function competition. Threefish uses no S-boxes or other table lookups in order to avoid cache timing attacks; its nonlinearity comes from alternating additions with exclusive ORs. In that respect, it is similar to Salsa20, TEA, and the SHA-3 candidates CubeHash and BLAKE.
Threefish and the Skein hash function were designed by Bruce Schneier, Niels Ferguson, Stefan Lucks, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, and Jesse Walker.
Threefish works on words of 64 bits (unsigned Little endian integers). is the number of plaintext words and also of key words. The tweak consists of two words. All additions and subtractions are defined modulo .
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