n=4的排列码设计，可以实现文件的加密、解密。内附有明文，也可自行编写。-n = 4, the permutation code design, can achieve file encryption, decryption. Enclosed expressly, or write your own.

read and write wav file

pb写的文件md5加密与文本加解密小工具，里面的dll可供其他语言调用，绝对的源码-pb write a text file encryption and decryption md5 gadget inside dll call for other languages, the absolute source