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。
But the traditional RBAC model doesnot give the method to control the role assignment and it cannot assure the least priority of the role's permission.
但传统的RBAC模型既没有给出控制角色指派的方法，也不能保证角色许可最少优先原则。
But the traditional RBAC mode does not give the method to control the role assignment and it cannot assure the least priority of the role 's permission.
但传统的RBAC模型既没有给出控制角色指派的方法，也不能保证角色许可最少优先原则。
But the traditional RBAC mode does not give the method to control the role assignment and it cannot assure the least priority of the role 's permission.
但传统的RBAC模型既没有给出控制角色指派的方法，也不能保证角色许可最少优先原则。
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