Understanding S-Boxes: The Nonlinear Core of Modern Block Ciphers 🔐

An S-box is a multivalued Boolean function that maps n-inputs to m-outputs. Its is generally used in any modern block cipher. SP-network fundamentally based on substitution and permutation boxes with number of rounds. S Box (Substitution Box). The S-Box and P-Box in Block Cipher Cryptography. S-Box Theory.

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