Historical
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). Like other components of the DES, the iterative nature of the Feistel construction makes implementing the cryptosystem in hardware easier (particularly on the hardware available at the time of DES' design).
Read more about this topic: Feistel Cipher
Famous quotes containing the word historical:
“Whether considered as a doctrine, or as an historical fact, or as a movemement, socialism, if it really remains socialism, cannot be brought into harmony with the dogmas of the Catholic church.... Religious socialism, Christian socialism, are expressions implying a contradiction in terms.”
—Pius XI [Achille Ratti] (1857–1939)
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—Owen Barfield (b. 1898)