Editing Square (cipher)

{{Short description|Block cipher invented by Joan Daemen and Vincent Rijmen}}
{{Infobox block cipher
| name          = Square
| image         = 
| caption       = 
| designers     = [[Joan Daemen]], [[Vincent Rijmen]]
| publish date  = 1997
| derived from  = 
| derived to    = [[Advanced Encryption Standard|AES]], [[CRYPTON]], [[Twofish]], [[Serpent (cipher)|Serpent]]
| key size      = 128 bits
| block size    = 128 bits
| structure     = [[substitution–permutation network]]
| rounds        = 8
| cryptanalysis = 
}}

In [[cryptography]], '''Square''' (sometimes written '''S<small>QUARE</small>''')  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 (cryptography)|key]].

Square is not patented.

==References==
* {{cite conference
    |author1=Joan Daemen |author2=Lars Knudsen |author3=Vincent Rijmen | title = The Block Cipher Square
    | conference = [[Fast Software Encryption]] (FSE) 1997, Volume 1267 of [[Lecture Notes in Computer Science]]
    | pages = 149–165
    | publisher = [[Springer-Verlag]]
    | date = 1997
    | location = [[Haifa, Israel]]
    |citeseerx=10.1.1.55.6109 }}
* [http://www.users.zetnet.co.uk/hopwood/crypto/scan/cs.html#Square SCAN's entry for Square]

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[[Category:Block ciphers]]


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