Square (cipher)

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In cryptography, Square (sometimes written SQUARE) is a block cipher invented by Joan Daemen and Vincent Rijmen. The design was published in 1997.

SQUARE is a predecessor to the Rijndael algorithm, which has been adopted in 2001 as the Advanced Encryption Standard by the U.S. government.

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 block size and using a 128-bit key size.

Square is not patented.

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