Modern Cryptanalysis by Swenson Christopher
Author:Swenson, Christopher
Language: eng
Format: epub
Publisher: John Wiley & Sons
Published: 2012-04-04T16:00:00+00:00
Basic Feistel Encryption Algorithm
The basic Feistel encryption algorithm structure is r rounds long, with the round function f.
1. Split the initial plaintext, P, into two halves: The “left half” (L0) consists of the most significant bits, and the “right half” (R0) consists of the least significant bits.
2. For each round, i = 1, ... , r, do the following:
(a) Calculate Ri = Li–1 ⊕ f(Ri–1, Ki) that is, the previous left half XORed with the round function (whose arguments are the previous right half and the current round key).
(b) Calculate Li = Ri–1
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