说明：  文件加密一例 给文件加密的技术很多,其中又分为不同等级,以适合不同场合的需要.这里给出最简单的文 件加密技术,即采用文件逐字节与密码异或方式对 文件进行加密,当解密时,只需再运行一遍加密程序即可. 　　下面是一个实例程序,能对任意一个文件进行加密,密码要求用户输入,限8位以内(当然你可以再更 改).程序有很好的容错设计,这是我们应该 学习的.
(File encryption file encryption technology to the case of many of which are divided into different grades to suit the needs of different occasions. Here are the most simple file encryption technology, which uses the file-by-byte XOR manner and password to encrypt files, When the decryption, just to run again encryption procedures. The following is an example program can be for any one file encryption, password requires the user to input, limited to 8 or less (of course, you can then change). procedures are very good fault-tolerant designs, and this is what we should learn.)