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What (who) is permutation box - definition
Permutation box
In cryptography, a permutation box (or P-box) is a method of bit-shuffling used to permute or transpose bits across S-boxes inputs, retaining diffusion while transposing.
Cyclic permutation
![Matrix]] of <math>\pi</math>](https://commons.wikimedia.org/wiki/Special:FilePath/4-el perm matrix 14.svg?width=200 "Matrix]] of <math>\pi</math>")
TYPE OF (MATHEMATICAL) PERMUTATION WITH NO FIXED ELEMENT
Transposition (mathematics); Circular permutation; Adjacent transposition; Circular Permutation; Anticyclic permutation
In mathematics, and in particular in group theory, a cyclic permutation (or cycle) is a permutation of the elements of some set X which maps the elements of some subset S of X to each other in a cyclic fashion, while fixing (that is, mapping to themselves) all other elements of X. If S has k elements, the cycle is called a k-cycle.
poor box
BOX THAT IS USED TO COLLECT COINS FOR CHARITABLE PURPOSES
Alms box; Offertory box; Mite box
¦ noun historical a collection box, especially one in a church, for gifts of money to aid the poor.
