The Feistel structure is a particular example of the more general structure used by all symmetric block ciphers.

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The Feistel structure is a specific design model used in many symmetric block ciphers, but not all symmetric block ciphers use the Feistel structure. It is a particular example of a symmetric design, but there are other designs like the Substitution-Permutation Network (SPN) used in symmetric block ciphers as well.

The Feistel Structure Is a Particular Example of the More