理想的最高效的身份验证解决方案是单点登录(single sign - on, SSO)解决方案；在这种解决方案中，用户只需要登录一次，就可以向所有网络资源验证他的身份。

And the ideal and most efficient authentication solution is a single sign-on one, or SSO, in which the user only has to log in once and is authenticated to all of the network resources.

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这不会影响到受信的单点登录类型的定制提供者，前提是底层的提供者可以正常方式验证通过。

This does not affect trusted signon type custom providers, providing that the underlying provider can be authenticated to in the normal way.

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在单点登录场景中，它读取会话中可能存在的令牌，令牌是由识别用户的更高的身份验证层放在会话中的。

In single sign-on scenarios it reads in a token from the session possibly placed in the session by some higher-level authentication layer which identifies a user.

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