| General | |
|---|---|
| Designers | Joan Daemen |
| First published | 1994 |
| Successors | NOEKEON |
| Related to | BaseKing |
| Cipher detail | |
| Key sizes | 96 bits |
| Block sizes | 96 bits |
| Structure | Substitution–permutation network |
| Rounds | 11 |
| Best publiccryptanalysis | |
| Related-key attack with 222chosen plaintexts | |
Incryptography,3-Way is ablock cipher designed in 1994 byJoan Daemen. It is closely related toBaseKing; the two are variants of the same general cipher technique.
3-Way has ablock size of 96bits, notably not apower of two such as the more common 64 or 128 bits. Thekey length is also 96 bits. The figure 96 arises from the use of three 32 bitwords in the algorithm, from which also is derived thecipher's name. When 3-Way was invented, 96-bit keys and blocks were quite strong, but more recent ciphers have a 128-bit block, and few now have keys shorter than 128 bits. 3-Way is an 11-roundsubstitution–permutation network.
3-Way is designed to be very efficient in a wide range of platforms from 8-bit processors to specializedhardware, and has some elegant mathematical features which enable nearly all the decryption to be done in exactly the same circuits as did the encryption.
3-Way, just as its counterpart BaseKing, is vulnerable torelated keycryptanalysis.John Kelsey,Bruce Schneier, andDavid Wagner showed how it can be broken with one related key query and aboutchosen plaintexts.
