Insures the system against destroys from illegal users by using authentication subsystem 采用身份认证对系统进行保护。
2.
This task has got results as follow . the first is the authentication subsystem . this subsystem insures the system against destroys from illegal users 用户身份认证子系统该子系统用以确定只有合法用户可以使用,以保证系统的安全性和可靠性。