3-Way

In cryptography, 3-Way isblock cipher designed1994 by Joan Daemen, who also (with Vincent Rijmen) designed Rijndael,winnerNIST's AES contest.

3-Wayunusualhavingfixed block size thatnotpower2, namely 96 bits. The key lengthalso 96 bits. The figure 96 arises fromusethree 32 bit words inalgorithm, from which alsoderivedcipher's name. When 3-Way was invented, 96 bit keysblocks were quite strong, but many modern ciphers have128 bit block,few now have keys shorter than 128 bits.

3-Waydesignedbe very efficientspecialised hardware,has some elegant mathematical features which enable nearly alldecryptionbe doneexactlysame circuits as didencryption.

Unfortunately, 3-Wayvulnerablerelated key cryptanalysis; John Kelsey, Bruce SchneierDavid Wagner show howcan be brokenone related key queryabout chosen plaintexts.