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Feistel cipher structure or Feistel cipher network is the building block of many block ciphers and encryption algorithms using secret key encryption. For example, Feistel cipher structure is used in the symmetric key Data Encryption Algorithm (DEA) used by the Data Encryption Standard (DES).
The Feistel cipher is explained with the help a detailed, easy and step by step example. Both the encryption and decryption processes of the Feistel cipher are explained in the worked example.
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