The Feistel cipher structure,based on Shannon's proposal of 1945, dates back over a quarter of a century and is the structure used by many significant symmetric block ciphers currently in use.

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The Feistel cipher structure was proposed by Horst Feistel in 1973, which is less than a quarter of a century ago as of 2021. However, it is true that many significant symmetric block ciphers currently in use, such as DES, use the Feistel cipher structure.

The Feistel Cipher Structure,based on Shannon's Proposal of 1945, Dates