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An Identity Provider (IdP) is responsible for issuing identification information and authenticating users by using security tokens like SAML 2.0. This is a favourable alternative to explicitly authenticating a user within a security realm.
In perimeter authentication, a user needs to be authenticated only once (single sign-on) and a security token is sent as a result. This is processed by an Identity Assertion Provider for each system it needs to access.
This section includes the following topics.