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 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".

Square

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

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 (1997). The Block Cipher Square. Fast Software Encryption (FSE) 1997, Volume 1267 of Lecture Notes in Computer Science. Haifa, Israel: Springer-Verlag. pp. 149–165. CiteSeerX 10.1.1.55.6109.
• SCAN's entry for Square