Rfsos was the first secure operating system that used the secure operating system architecture of generalized framework for access control in mainland china . in rfsos , security attribute database , secision enforcement module and security decision module are separate from each other . this architecture flexibly supports multiple access control mechanisms 红旗安全操作系统在国内首次采用基于通用访问控制框架的安全操作系统体系结构,将安全属性数据、安全决策和决策实施三者分离,可以灵活地支持多种访问控制机制。