Zodiac (cipher)

Zodiac (cipher)

Infobox block cipher
name = Zodiac
designers = Chang-Hyi Lee
publish date = 2000
derived from = SAFER, SHARK
derived to =
related to = Xenon
key size = 128, 192, or 256 bits
block size = 128 bits
structure = Feistel network
rounds = 16
cryptanalysis = Impossible differential cryptanalysis recovers 128-bit key in 2119 encryptions

In cryptography, Zodiac is a block cipher designed in 2000 by Chang-Hyi Lee for the Korean firm SoftForum.

Zodiac uses a 16-round Feistel network structure with key whitening. The round function uses only XORs and S-box lookups. There are two 8×8-bit S-boxes: one based on the discrete exponentiation 45"x" as in SAFER, the other using the multiplicative inverse in the finite field GF(28), as introduced by SHARK.

Zodiac is theoretically vulnerable to impossible differential cryptanalysis, which can recover a 128-bit key in 2119 encryptions.

References

*
* cite conference
author = Deukjo Hong, Jaechul Sung, Shiho Moriai, Sangjin Lee, and Jongin Lim
title = Impossible Differential Cryptanalysis of Zodiac
booktitle = 8th International Workshop on Fast Software Encryption (FSE 2001)
pages = pp.300–311
publisher = Springer-Verlag
date = April 2001
location = Yokohama
url = http://www.mathmagic.cn/Crypt1998-2003/bibs/2355/23550300.htm
format = PDF
accessdate = 2006-12-30


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