Square (cipher)

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 the Rijndael algorithm, 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.

References

• Joan Daemen, Lars Knudsen, Vincent Rijmen, , Fast Software Encryption, Volume 1267 of Lecture Notes in Computer Science (E. Biham, ed.), pp. 149–165. Springer-Verlag, 1997.