一个简单的DES算法，Windows Console Application。不能读入文件，但稍微修改一下就行了。另外算法用的是字符串所以在速度上可能并不快。本人大一学生，理解并不深刻，希望谅解。-A simple DES algorithm, the Windows Console Application. Can not read the file, but a little change on the line. In addition, the algorithm used is the string so the speed may not be fast. I freshmen, understand the profound hope and understanding.