Horst Feistel was a German-born cryptographer known for his significant contributions to the field of cryptography, particularly in the development of symmetric-key block ciphers. He is best known for designing the Feistel network, which is a crucial structure that underlies many widely-used encryption algorithms. The Feistel network divides the input data into two halves and processes them through multiple rounds of permutation and substitution, allowing for the creation of a strong and secure encryption method.
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