Temporal constraints are introduced in the user assignment and permission assignment to express and realize more powerful access control semantics.
在用户分配和权限分配中引入时间约束，表示和实现了更为丰富的访问控制语义。
Based on RBAC model, this paper introduces negative authorization into the user assignment and permission assignment, and discusses their realizing approaches and features.
本文在RBAC模型基础上，分别在用户分配和权限分配中引入了负授权，讨论了负授权的实现方式及其特点。
Based on RBAC model, this paper introduces negative authorization into the user assignment and permission assignment, and discusses their realizing approaches and features.
本文在RBAC模型基础上，分别在用户分配和权限分配中引入了负授权，讨论了负授权的实现方式及其特点。
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