Visual c++ 下使用C语言开发的ARC4流加密算法，密钥长度可变，可实现以字节为单位的流加密，加密强度比AES分组加密算法弱，但是效率比AES算法高。-C language development Visual c++ ARC4 stream encryption algorithm and key length is variable and can be realized in bytes stream encryption, encryption strength than AES block encryption algorithm is weak, but the efficiency is higher than AES algorithm.