摘要： 网格安全主要解决网格环境中实体间的认证和授权问题。现有的网格授权模型大多基于传统的访问控制方式，没有考虑到具体的任务和执行环境。该文在研究现有的访问控制方式的基础上，对基于角色授权的网格模型进行扩展，引入任务和条件的概念，实现了基于任务的动态授权。

关键词: 网格安全, 授权, 角色授权, CAS

Abstract: Grid security mainly resolves the problem of the authentication and authorization among entities in gird. Now, existing grid authorization models are mostly based on traditional access control, and they do not take the particular task or the executing environment into account. According to the research of existing access control, this paper extends the role-based access control model through introducing the concept of task and condition, and achieves dynamic authorization based on task.

Key words: grid security, authorization, role-based access control, community authorization server(CAS)

中图分类号: 

• TP309