说明：  RC4-简介 RC4加密算法是大名鼎鼎的RSA三人组中的头号人物Ron Rivest在1987年设计的密钥长度可变的流加密算法簇。之所以称其为簇，是由于其核心部分的S-box长度可为任意，但一般为256字节。该算法的速度可以达到DES加密的10倍左右。
(RC4 RC4-profile RSA encryption algorithm is the famous trio of top man Ron Rivest in 1987, the design flow of variable length key encryption algorithm clusters. It is called a cluster, is due to the core part of the S-box can be any length, but generally 256 bytes. The speed of the algorithm can achieve about 10 times DES encryption.)