此模型支持用户单点登录到受信任应用程序，由后者以用户的身份进行服务请求。
This model supports single sign on by users to trusted applications which are able to make service requests on their behalf.
为了避免为每个数据源一一执行用户认证，可以利用单点登录。
To avoid having to authenticate the user for each data source, single sign-on techniques can be leveraged.
它涵盖任何安全管理解决方案都具有的要素，比如用户认证、访问权限控制、审计、单点登录、高可用性和日志记录。
This includes authentication of users, control of access privileges, auditing, single sign-on, high availability, and logging that are elements of any security management solution.
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