一种结合用户许可的多级安全策略模型

针对BLP模型存在“向上写”规则破坏数据完整性、主体分配权限过大及客体安全等级不变的问题，提出一种结合用户许可的多级安全策略模型。该模型利用可信度标识对主体写操作进行完整性保护，通过用户许可标识解决BLP模型和可信度标识存在的主体分配权限过大问题，结合系统管理员仲裁机制对修改的客体安全等级进行动态调整。理论分析表明，该模型能够保证系统的安全。

Multilevel Security Policy Model Combined with User Permission

Aiming at the problem that BLP model's access rule of no write down destroy data integrity,subject has most privilege and object holds constant security level,this paper presents a multilevel security policy model combined with user permission. In the model,trusted label is used in subject writing to protect object integrity. User permission solves the problem that subject privilege in BLP model and trusted label has more rights to steal data. By importing arbitration for system administrator,confidential l...