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中文摘要：
随着应用服务提供商（ASP）模式的发展,为解决集成了越来越多应用服务的ASP平台与用户之间复杂的管理需求,提出了一种ASP模式下用户授权代理机制的角色访问控制（UD_RBAC）模型.文中对UD_RBAC模型形式化描述,细致地分析了其构成要素、用户授权代理管理模式和实施策略.采用LDAP目录访问协议统一存储用户身份和权限信息,通过代理策略保护应用服务资源,实现对用户的访问进行分级授权和控制.
英文摘要：
With the development of the application service provider（ASP）pattern,to solve the complicated management requirements between users and services in ASP service platform,this paper presents a role-based access control based on user delegation mechanism in ASP pattern（UD-RBAC）.The paper uses a formalization to describe the UD_RBAC model,analyses it＇s user delegation management and brings it＇s strategy into effect,All user＇s identification and authorization information were stored in a light-weight directory access protocol（LDAP）,policy agents were set up to protect the application service resources,and implemented Layered Authorization and control for user＇s access.
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