Web Reference: One of the most elegant solutions for cryptography. Dr Mike Pound explains one of his most favourite ciphers. ...more Feistel networks were first seen commercially in IBM's Lucifer cipher, designed by Horst Feistel and Don Coppersmith in 1973. Feistel networks gained respectability when the U.S. Federal Government adopted the DES (a cipher based on Lucifer, with changes made by the NSA) in 1976. This is a feistel cipher implementation I wrote for a Computerphile video. While I started with this being a simple couple of functions, I realised that if I wanted proper file IO, I needed to code up a mode of operation.
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