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Authentication is the process of obtaining identification credentials from a user ( such as name and password ), and validating those credentials against some authority.

If the credentials are valid, the entity that submitted the credentials is considered an authenticated identity. Once an identity has been authenticated, the authorization process determines whether that identity has access to a given resource.

ASP.NET implements authentication through authentication providers, the modules that contain the code to authenticate the requestor’s credentials. This section describes the authentication providers built into ASP.NET.

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The Windows Authentication Provider Describes how to use the Windows Authentication provider	The Passport Authentication Provider Describes how to use the Passport Authentication provider.
The Forms Authentication Provider Describes how to use the Forms Authentication provider.

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ASP.NET Membership Describes the membership features introduced in ASP.NET 2.0 that provide a practical solution for user authentication.	ASP.NET Authorization Describes two fundamental ways to authorize access to a resource.

System.Web.Security Namespace