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Bruce Schneier's Description of a new variable-length key, 64-bit block cipher (Blowfish) (in proceedings of the first FSE conference, held Dec. 1993) defines that Blofish's key is of 4 to 56 bytes (32 to 448-bit), with this rationale for the maximum: The 448 limit on the key size ensures that the every bit of every subkey depends on every bit of the ...

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