Zodiac (cipher)
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This article is about the block cipher. For other uses, see Zodiac (disambiguation).
| Designer(s): | Chang-Hyi Lee |
|---|---|
| First published: | 2000 |
| Derived from: | SAFER, Square |
| Related to: | Xenon |
| Key size(s): | 128, 192, or 256 bits |
| Block size(s): | 128 bits |
| Structure: | Feistel network |
| Rounds: | 16 |
| Best public 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 45x as in SAFER, the other using the multiplicative inverse in the finite field GF(28), as introduced by Square.
Zodiac is theoretically vulnerable to impossible differential cryptanalysis, which can recover a 128-bit key in 2119 encryptions.
[edit] References
- Zodiac Technical Material (PDF)
- Deukjo Hong, Jaechul Sung, Shiho Moriai, Sangjin Lee, and Jongin Lim (2001-04). "Impossible Differential Cryptanalysis of Zodiac" (PDF). 8th International Workshop on Fast Software Encryption (FSE 2001): 300-311, Yokohama: Springer-Verlag. Retrieved on 2006-12-30.
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