多数用户在登录软件系统时，通常提供自己的用户名(当事人)和支持他们的密码(证书)。

When most users login to a software application, they usually provide their username (the principal) and their supporting password (the credential).

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例如，当我希望用户登录时，我需要能够搜索的第一样东西是用户名。

When I want a user to log in, for example, the first thing I need to be able to search on would be the username.

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该用户下次登录时，Acegi可以从缓存中加载他或她的详细信息(比如用户名、密码和权限)，而不是从后端数据存储中读取数据。

The next time the user signs in, Acegi can load his or her details (such as username, password, and privileges) from the cache instead of reading from back-end data storage.

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