|Key sizes||128, 192, or 256 bits|
|Block sizes||128 bits|
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 doesn't use any S-boxes. The only operations it uses are XOR, addition, multiplication, and bit shifts.
Further reading 
- Toshio TOKITA and Mitsuru MATSUI (1 January 2003). "Linear Cryptanalysis of Block Cipher Xenon". IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences. E86-A (1): 13–18.
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