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Xenon (cipher)

DesignersChang-Hyi Lee
First published2000
Related toZodiac
Cipher detail
Key sizes128, 192, or 256 bits
Block sizes128 bits
StructureFeistel network

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

The algorithm uses a key size of 128, 192, or 256 bits. It operates on blocks of 128 bits using a 16-round Feistel network structure with key whitening. Designed for speed, Xenon's round function does not use any S-boxes. The only operations it uses are XOR, addition, multiplication, and bit shifts.[1]


  1. ^ "Xenon 1.0: Architecture and Specification" (PDF). Block Cipher Proposal, ISO/IEC/JTC1-SC27. September 2000. Archived from the original (PDF) on 2003-10-24.

Further reading