关键词: 信息安全, 访问控制, 实时更新, 并发控制

Abstract: Dynamic environments pose new challenges to access control. In order to guarantee the security of information system in dynamic environment, the needs for realtime update of access control policies rise while the policies are in effect and enforcing the changes immediately. Simple concurrent control algorithms for realtime update of access control policy were given in the model. The model and algorithms are useful for concurrent environment in which multiple subjects access and modify data and access control policies, while the policies are in effect.

Key words: information security, access control, real-time update, concurrent control