数据加宓标准DES算法於Matlab上的实现。 源码取自於：GreenSim——算法仿真團隊→http://blog.sina.com.cn/greensim 但该源码有误，少了Initial Permutation 和Inverse initial Permutation。由小弟小做修改。-DES encode function on matlab.

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