Insures the system against destroys from illegal users by using authentication subsystem 采用身份認證對系統進行保護。
This task has got results as follow . the first is the authentication subsystem . this subsystem insures the system against destroys from illegal users 用戶身份認證子系統該子系統用以確定只有合法用戶可以使用,以保證系統的安全性和可靠性。