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 encryption algorithm is RSA famous trio of top figures Ron Rivest in 1987, the design of variable length key encryption algorithm flow clusters. The reason for the cluster it is due to the core part of the S-box length can be arbitrary, but is generally 256 bytes. The speed of the algorithm is DES encryption can be achieved about 10 times.