说到字符，很多用户也许会不以为然：小小的字符，不过是个非常基础的人机交互表达形式，它能产生什么威胁？但是，威胁偏偏就来自 最原始的方面，并且这种威胁往往是最危险的，也是最难以防范的。-Speaking of characters, many users may not: a small character, but is a human-computer interaction based on the expression of the form of what the threat of

带有MD5加密的用户认证函数，telnet登陆指令操作，cli交互界面-MD5 encryption with user authentication functions, telnet login command operation, cli interface

经典加密算法playfair，25位密码表默认已添加，不能与用户交互。-Classic default encryption algorithms Playfair,25 password table has been added, you cannot interact with the user.