【摘要】 由于虚拟组织的分布性和动态性,在网格计算系统中实施面向虚拟组织的授权服务十分困难。本文分析了网格计算系统中的授权服务需求和已有授权机制存在的问题,提出了多级授权架构MLA。该架构基于门限闭包机制,具有较强的策略描述能力与可扩展性,因而能够更加灵活高效地在网格计算系统中实施授权服务。更多还原

【Abstract】 It is a challenging work to implement authorization service for Virtual Organization in Grid Computing Sys- tem because of the dynamic and distributed nature of Virtual Organication. After analyzing the requirement of autho- rization service and the existing mechanisms for implementing authorization services in Grid Computing Systems, the paper proposes an efficient multi-level architecture named MLA for implementing authorization in Grid Computing Systems. With the use of threshold closure mechanism, the proposed architecture has the scalability and the strong power to express authorization policy, hence can provide flexible and efficient approach to implement authorization service in GCS.更多还原