【摘要】 <正> 操作系统的安全是所有计算机系统安全的基础。访问控制是计算机保护尤其是操作系统保护中极其重要的一环。在访问控制中,对其访问必须进行控制的资源称为客体,同理,必须控制它对客体的访问的活动资源称为主体。主体即访问的发起者,通常为进程程序或用户。客体包括各种资源,如文更多还原

【Abstract】 Security of operation system is the basis of protecting computer system against attack . To resolve more and more problem in security area ,we need an operation system of great security. That require we find an effective method to develop an security-enhanced operation system to meet these needs. Access control is often used in modern operation system. It is based on identity affirm and enforces control to the resources that are required by the identify. In this paper we mainly discuss security policies based on object (Mac and Dac).更多还原