【摘要】 为了能更加充分地表达现实世界中复杂的、动态的访问控制授权关系,提出了一个基于任务的动态角色访问控制模型———TD RBAC。采用扩展谓词任务模型描述并发事务逻辑,在基于子任务的并发执行活动网络模型上分析出各个子任务之间的动态约束关系,从而在传统RBAC模型基础上扩展了动态的角色约束关系。性能评估分析结果显示TD RBAC模型在分布式并行计算环境下具有较好的访问控制效率。更多还原

【Abstract】 In order to express the complicated and dynamic access control authorization relations in the real world,a novel model—TD-RBAC(Task-based Dynamic RBAC) was proposed.The concurrent transaction logic was described by the extended predicate task model and the dynamic constraint relations among the subtasks was found out by analyzing the concurrent executive net of subtasks.The dynamic role constraint relations based on the traditional RBAC was extended. The analysis of the performance evaluating showed that the TD-RBAC has favorable access control efficiency under the distributed parallel computing.更多还原