![]() ![]() ![]() An m× n S-box can be implemented as a lookup table with 2 m words of n bits each. In general, an S-box takes some number of input bits, m, and transforms them into some number of output bits, n, where n is not necessarily equal to m. Mathematically, an S-box is a vectorial Boolean function. ![]() In block ciphers, they are typically used to obscure the relationship between the key and the ciphertext, thus ensuring Shannon's property of confusion. In cryptography, an S-box ( substitution-box) is a basic component of symmetric key algorithms which performs substitution.
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