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An Observation on the Key Schedule of Twofish
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The 16-byte block cipher Twofish was proposed as a candidate for the Advanced Encryption Standard (AES). This paper notes the following two properties of the Twofish key schedule. Firstly, there is a non-uniform distribution of 16-byte whitening subkeys. Secondly, in a reduced (fixed Feistel round function) Twofish with an 8-byte key, there is a non-uniform distribution of any 8-byte round subkey. An example of two distinct 8-byte keys giving the same round subkey is given.
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