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This document provides an overview and comparison of several identity frameworks: SAML, OpenID, Windows CardSpace. It describes the goals and design of each, including how they handle authentication and the exchange of identity information between an identity provider and a service provider. Key aspects covered include SAML's use of assertions to declare facts, OpenID's use of URLs/XRI identifiers and authentication through verifying ownership of a web resource, and how CardSpace uses "cards" and claims to mediate identity provider/relying party relationships.
