| General | |
|---|---|
| Designers | Joan Daemen, Vincent Rijmen |
| First published | 1997 |
| Successors | AES, CRYPTON, Twofish, Serpent |
| Cipher detail | |
| Key sizes | 128 bits |
| Block sizes | 128 bits |
| Structure | substitution–permutation network |
| Rounds | 8 |
In cryptography, Square (sometimes written SQUARE) is a block cipher invented by Joan Daemen and Vincent Rijmen. The design, published in 1997, is a forerunner to Rijndael, which has been adopted as the Advanced Encryption Standard. Square was introduced together with a new form of cryptanalysis discovered by Lars Knudsen, called the "Square attack".
The structure of Square is a substitution–permutation network with eight rounds, operating on 128-bit blocks and using a 128-bit key.
Square is not patented.