SHARK

SHARK

Infobox block cipher
name = SHARK
designers = Vincent Rijmen, Joan Daemen, Bart Preneel, Antoon Bosselaers, Erik De Win
publish date = 1996
derived from =
derived to = KHAZAD, Rijndael
related to =
key size = 128 bits
block size = 64 bits
structure = Substitution-permutation network
rounds = 6
cryptanalysis =

In cryptography, SHARK is a block cipher identified as one of the predecessors of Rijndael (the Advanced Encryption Standard).

SHARK has a 64-bit block size and a 128-bit key size. It is a six round SP-network which alternates a key mixing stage with linear and non-linear transformation layers. The linear transformation uses an MDS matrix representing a Reed-Solomon error correcting code in order to guarantee good diffusion. The nonlinear layer is composed of eight 8×8-bit S-boxes based on the function "F(x) = x-1" over "GF(28)".

Five rounds of a modified version of SHARK can be broken using an interpolation attack (Jakobsen and Knudsen, 1997).

ee also

* KHAZAD
* Square

References

* cite conference
author = Vincent Rijmen, Joan Daemen, Bart Preneel, Anton Bosselaers, Erik De Win
title = The Cipher SHARK
booktitle = 3rd International Workshop on Fast Software Encryption (FSE '96)
pages = pp.99–111
publisher = Springer-Verlag
date = February 1996
location = Cambridge
url = http://citeseer.ist.psu.edu/rijmen96cipher.html
format = PDF/PostScript
accessdate = 2007-03-06
* cite conference
author = T. Jakobsen, L.R. Knudsen
title = The Interpolation Attack on Block Ciphers
booktitle = 4th International Workshop on Fast Software Encryption (FSE '97)
pages = pp.28–40
publisher = Springer-Verlag
date = January 1997
location = Haifa
url = http://citeseer.ist.psu.edu/jakobsen97interpolation.html
format = PDF/PostScript
accessdate = 2007-01-23
* cite book
author = Joan Daemen, Vincent Rijmen
title = The Design of Rijndael: AES—The Advanced Encryption Standard
publisher = Springer-Verlag
date = 2002
id = ISBN 3-540-42580-2

External links

* [http://www.users.zetnet.co.uk/hopwood/crypto/scan/cs.html#SHARK-A SCAN's entry for SHARK]


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  • shark — [ʆɑːk ǁ ʆɑːrk] noun [countable] informal FINANCE someone who cheats other people out of money, especially by giving bad financial advice: • Never do business with these sharks. ˈloan shark FINANCE someone who lends money at very high rates of… …   Financial and business terms

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  • shark — Ⅰ. shark [1] ► NOUN ▪ a long bodied cartilaginous marine fish, typically predatory and voracious, with a prominent dorsal fin. ORIGIN of unknown origin. Ⅱ. shark [2] ► NOUN informal ▪ a person who exploits or swindles others …   English terms dictionary

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