中文摘要：

首先给出了网格计算中访问控制的特点和需求，现有的访问控制技术以及分布式授权模型都不能满足网格计算中对访问控制的需求。通过建立实体间的信任关系，在CAS基础上提出了基于信任度的访问控制机制。为了提高资源的利用率提出了Ticket机制。

英文摘要：

Analyses the feature and requirement of access control for grid computing. Access control technologies and distributed authorization models that already have existed do not satisfy the requirement of access control in grid computing. By building trust relationship between entities, this paper puts forth a trust-based access control model for grid computing. In order to improve sharing of resource, a Ticket method is introduced.