Access control is a basic technology in network security. It includes the role based access control and the task based access control, etc.
访问控制技术是网络安全的一项基本技术，主要包括基于角色的访问控制和基于任务的访问控制等技术。
It puts forwards a new access control mode based on role and task to make access control more flexible. The formalized meaning, restriction and application in school grid are also presented.
分析了以上两种模型存在的问题，为了使访问控制更灵活，提出了一种基于角色和任务的访问控制模型，并给出了模型的形式化定义、授权约束和在校园网格中的应用。
This paper introduces the theory of access control model based on role and task, and analyzes task and the shortage of above models.
介绍了基于角色的访问控制模型和基于任务的访问控制模型的原理。
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