Permutations of these polygon lists further extend possible vertex figures.
With each DNS response, the IP address sequence in the list is permuted.
Such cryptograms were not uncommon; Brady comments on (from Richard Bernard's Key of Knowledge of 1617) the phrase Generalis Dei Vicarius in Terris likewise treated, and Thomas Beard’s 1625 permutation Vicarius Dei Generalis in Terris, perhaps influenced by Helwig.
For example, MISTY1 is a Feistel cipher using a three-round Feistel network in its round function, Skipjack is a modified Feistel cipher using a Feistel network in its G permutation, and Threefish (part of Skein) is a non-Feistel block cipher that uses a Feistel-like MIX function.
The Steinhaus–Johnson–Trotter algorithm or Johnson–Trotter algorithm, also called plain changes, is an algorithm named after Hugo Steinhaus, Selmer M. Johnson and Hale F. Trotter that generates all of the permutations of n elements.