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在ＭＩＳ系统的用户口令管理中引入单向函数和智能卡技术，单向函数使得入侵者从口令表中只能浏览到用户的加密口令，并且从加密口令获得用户的秘密口令是非常困难的；智能卡的引入使得用户的登录依赖于不易仿制的外部存储装置，因此这样的ＭＩＳ系统有效地保护了用户的口令，具有较高的安全性能．
One-way functions and smart card technologies are introduced in the user password management of the MIS system. The one-way function allows the intruder to browse only the user’s encrypted password from the password table, and it is very difficult to obtain the user’s secret password from the encrypted password. The introduction of the user’s login depends on the external storage device is not easy to imitate, so the MIS system effectively protects the user’s password, with high security.