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[[authentication]]
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= Authentication
Spring Security provides comprehensive support for https://en.wikipedia.org/wiki/Authentication[authentication].
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Authentication is how we verify the identity of who is trying to access a particular resource.
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A common way to authenticate users is by requiring the user to enter a username and password.
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Once authentication is performed we know the identity and can perform authorization.
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Spring Security provides built-in support for authenticating users.
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This section is dedicated to generic authentication support that applies in both Servlet and WebFlux environments.
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Refer to the sections on authentication for xref:servlet/authentication/index.adoc#servlet-authentication[Servlet] and xref:servlet/authentication/index.adoc[WebFlux] for details on what is supported for each stack.
