Authorization constraint is an important part in role-based access control models.
授权约束是基于角色的访问控制模型中一个非常重要的部分。
Then, the paper describes several typical Role Based Access Control models, at the same time analyzes and compares them.
然后，描述了几种具有代表性的基于角色的访问控制模型，并对这几种访问控制模型进行了分析比较。
Synthesizes main models of role - based aceros control and designs a time role - based access control model which is called TRBAC model.
在基于角色访问控制的几种主要模型的基础上，提出了一种基于时间的角色访问控制模型。
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