传统加密技术对于当今的网络安全发挥不了大作用，但这些是密码学的基础，是密码学的历史。Vigenere密码就是一种传统加密技术，它是多表代换密码，能够有效改进单表代换密码的词频分布特征问题。-Traditional encryption technology is no big role to play for today s network security, but these are the basis of cryptography is the history of cryptograp