【摘要】 为在转授权过程中实现双边协议和动态角色互斥约束,解决由权限共享引起的角色互斥问题,提出了基于角色的动态转授权模型。首先,对模型的核心思想进行了阐述;然后,结合离散数学的相关知识对模型中的组成元素、元素间的相互关系和转授权的约束进行了形式化描述;最后,对如何借助Agent,在兼顾动态职责分离约束的同时实施带时间限制的部分角色转授权,以及对权限共享问题的处理细节进行了阐述。更多还原

【Abstract】 To realize bilateral protocols and dynamic restriction of roles mutex,and to solve the problems arose by permission sharing,a role-based dynamic delegation model was proposed.Firstly,the main idea of the model was explained.Secondly,the constitution elements,elements relationships and delegation restrictions were expatiated with discrete mathematical expressions.Finally,details on how to achieve temporal delegation,part-role delegation,bilateral protocols,and dynamic restriction of roles mutex as well as how to solve the problem of permission sharing based on Agent in the whole delegation process were discussed.更多还原