Feistel Cipher Structure | Feistel Cipher Encryption Decryption Process

Feistel Cipher Structure | Feistel Cipher Encryption Decryption Process

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In this video, I have explained Feistel Cipher encryption and decryption process has been covered. Also explained working of Feistel Cipher Structure.

Introduction of Feistel Cipher Structure:
Feistel proposed a scheme to produced a block cipher using permutation and substitution alternatively. The inputs to the encryption algorithm are a plaintext block of length 2w bits and a key Ki. The plaintext block is divided into two halves, LE0 and RE0. The two halves of the data pass through rounds of processing and then combine to produce the ciphertext block.

Working of Feistel Cipher Structure
A substitution is performed on the left half of the data. This is done by applying a round function F to the right half of the data and then taking the exclusive-OR of the output of that function and the left half of the data. The round function has the same general structure for each round but is parameterized by the round subkey Ki. Permutation is performed that consists of the interchange of the two halves of the data. This structure is a particular form of the substitution-permutation network (SPN) proposed by Shannon.

0:00 Introduction
0:30 Introduction of feistel Cipher Structure
3:19 Working of Feistel Cipher Structure
5:53 Encryption & Decryption Diagram of Feistel Cipher

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