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Zodiac (cipher)

Incryptography, 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 exponentiation45^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.

• Zodiac Technical Material (PDF) at the Wayback Machine (archive index)
• Deukjo Hong; Jaechul Sung; Shiho Moriai; Sangjin Lee & Jongin Lim (April 2001). Impossible Differential Cryptanalysis of Zodiac. 8th International Workshop on Fast Software Encryption (FSE 2001). Yokohama: Springer-Verlag. pp. 300–311. doi:10.1007/3-540-45473-X_25. ISBN 9783540438694. Archived from the original (PDF) on 2007-12-13. Retrieved 2007-09-14.

• HONG D, SUNG J, MORIAI S, LEE S, LIM J (2002). "Cryptography and Information Security. Impossible Differential Cryptanalysis of Zodiac". IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. E85-A (1): 38–43.
• Wen Ji & Lei Hu (2008). "Square Attack on Reduced-Round Zodiac Cipher". Information Security Practice and Experience. Lecture Notes in Computer Science. Vol. 4991. Springer. pp. 377–391. doi:10.1007/978-3-540-79104-1_27. ISBN 978-3-540-79103-4.

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