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Overview
OpenID is an open standard that provides user authentication (identity) features and is built upon OAuth 2.0 flows. Like SAML, it uses an external identity provider (IdP) to authenticate the user and enables single sign-on (SSO). While there are several underlying technical differences between SAML and OpenID, the most important differences are that OpenID is a lighter-weight protocol and requires explicit user consent to access as part of its communication flows.
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