Third, based on the thorough research of the multilevel security models, integrity models and Role-Based Access Control Models (RBAC), a modified BLP model (MBLP) is designed and applied in a secure operating system developed independently.

• 第三，在深入研究多级安全模型、完整性模型、基于角色的授权模型等基础上，首先提出了一个修改BLP模型(MBLP)的方案，并在一个自主开发的安全操作系统中得到了应用；