维吉尼亚密码的c++实现,维吉尼亚密码的c++实现.-Virginia password, c++ implementation

维吉尼亚密码，是单表替换密码的升级版本，比单表密码安全级别要高，是新手学密码的好东西-Virginia password, a single table substitution upgraded version of the password, the password security level than a single table to be high, is a good thing for a novice to lear