The permutation function rot_word is declared in Line 1 . The input ”word” w_in is a row vector of four bytes and is cyclically permuted according to Figure 13. In Matlab the permutation can easily be achieved by utilizing the new index vector in

基于MATLAB的双向耦合帐篷映射格子模型的设计，产生简单的二元混沌图-MATLAB-based two-way coupled tent map lattice model of design, to produce a simple binary chaotic Figure