CHAPTER 9
BLOCK-CIPHERS: LUCIFER, DES, AND AES
THE IBM Corporation decided to offer data security functionality using encryption for its customers in 1966. Horst Feistel (Fig. 9.1), who had previously worked in the cryptographic area, had developed a block cipher that was implemented in the IBM product for the Lloyd's bank. LUCIFER and its successor DES, had a profound effect on cryptography; it led to public-key cryptography, the active involvement of the university community, and changes in NSA. We review this development, the controversy surrounding DES, the replacement of DES by Rijndael, and the design of block ciphers.
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