What is Product cipher?
In [[cryptography]], a '''product cipher''' is a popular type of [[stream cipher]]s that works by executing in sequence a number of simple transformations such as [[Substitution cipher|substitution]], [[Transposition cipher|permutation]], and [[modular arithmetic]]. Product ciphers usually consist of iterations of several ''rounds'' of the same algorithm. Individual ''rounds'' themselves are not secure. However, it is hoped that a sufficiently long chain of ''rounds'' loads the cipher with sufficient [[confusion and diffusion]] properties to make it resistant to [[cryptanalysis]]. A product cipher that uses only substitutions and permutations is called a [[SP-network]]. [[Feistel cipher]]s are another important class of product ciphers. {{Math-stub}} [[Category:Cryptography]]