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, "The Block Cipher Square" (PDF), Fast Software Encryption, Volume 1267 of Lecture Notes in Computer Science (E. Biham, ed.), pp. 149–165. Springer-Verlag, 1997.

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