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中文摘要：
针对目前网格中的社区授权服务（Community Authorization Service，CAS）推式模型所存在的某些安全问题，本文实现了一种拉式模型．在拉式模型中，引入一个CAS缓存服务器，由资源提供者（不是用户）向CAS缓冲服务器查询用户的权限声明，并与本地授权策略相结合形成用户在本资源上的最终有效权限．文中详细描述了用户向资源提供者进行服务请求的认证步骤、拉式模型的核心部分，并从运行效率和安全性、可靠性等方面与推式模型进行了对比分析．
英文摘要：
This paper provided and implemented a pulling-model to some problems existed in current Community Authorization Service （CAS） pushing-model. In the pulling-model, a CAS Caching Server is introduced, and the resource providers （but not users）must search user＇s authorization assertion from the CAS caching server to obtain final effective rights for users on the resource. The authentication steps how users require services on providers, and the core section of the pulling-model are described in detail. It is contrastively analyzed with pushing-modal from performance, security and dependability.
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