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Understanding Shibboleth

Shibboleth is a free, open-source web single sign-on system with rich attribute-exchange based on open standards, principally SAML. It is a federated system, supporting secure access to resources across security domains. Information about a user is sent from a home identity provider (IdP) to a service provider (SP) which prepares the information for protection of sensitive content and use by applications. So-called federations, while not a purely technical construct, can often be used to help providers trust each other in a scalable way.

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