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Lucifer cipher

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Lucifer was a cryptographic algorithm developed by Horst Feistel at IBM. It saw some commercial use in the 1970s.

Lucifer had a 128-bit key and operated on 128-bit blocks. Weakened by a 56-bit key and 64-bit block, but strengthened against differential cryptanalysis, it became the Data Encryption Standard in 1977.

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