View source for DEAL

{{Short description|Block cipher}}
{{Other uses|Deal (disambiguation)}}
{{Infobox block cipher
| name          = DEAL
| image         = [[Image:Deal-round-function.svg|200px|center]]
| caption       = Round function of DEAL
| designers     = [[Lars Knudsen]]
| publish date  = 1998
| derived from  = [[Data Encryption Standard|DES]]
| derived to    =
| related to    = [[Ladder-DES]]
| key size      = 128, 192 or 256 bits
| block size    = 128 bits
| structure     = Nested [[Feistel network]]
| rounds        = 6 (128- and 192-bit key) or 8 (256-bit key)
| cryptanalysis =
}}
In [[cryptography]], '''DEAL''' ('''Data Encryption Algorithm with Larger blocks''') is a [[Symmetric-key algorithm|symmetric]] [[block cipher]] derived from the [[Data Encryption Standard]] (DES). Its design was presented by [[Lars Knudsen]] at the [[Selected Areas in Cryptography|SAC]] conference in 1997, and submitted as a proposal to the [[AES contest]] in 1998 by [[Richard Outerbridge]].
DEAL is a [[Feistel network]] which uses [[Data Encryption Standard|DES]] as the round function. It has a 128-bit [[block size (cryptography)|block size]] and a variable [[key size]] of either 128, 192, or 256 bits; with 128-bit and 192-bit keys it applies 6 rounds, or 8 rounds with 256-bit keys. It has performance comparable to [[Triple DES]], and was therefore relatively slow among AES candidates.
==See also==
* [[Ladder-DES]]
* [[Luby–Rackoff block cipher]]
==References==
* {{cite conference
| author = [[John Kelsey (cryptanalyst)|John Kelsey]], [[Bruce Schneier]]
| title = Key-Schedule Cryptanalysis of DEAL
| conference = 6th Annual International Workshop on [[Selected Areas in Cryptography]] (SAC '99)
| pages = 118&ndash;134
| publisher = [[Springer-Verlag]]
| date = August 1999
| location = [[Kingston, Ontario]]
| url = http://www.schneier.com/paper-deal.html
| format = [[PDF]]/[[PostScript]]
| access-date = 2007-08-23 }}
* [[Stefan Lucks]]: On Security of the 128-Bit Block Cipher DEAL. [[Fast Software Encryption]] 1999: 60&ndash;70
==External links==
* [https://web.archive.org/web/20040630201630/http://www.mat.dtu.dk/people/Lars.R.Knudsen/newblock.html The original DEAL report]
* [http://www.users.zetnet.co.uk/hopwood/crypto/scan/cs.html#DEAL SCAN's entry for DEAL]
* [http://csrc.nist.gov/archive/aes/round1/conf1/deal-slides.pdf AES presentation slides] (PDF)
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