What is OpenID Connect (OIDC)?

OpenID Connect (OIDC) is an authentication layer built on top of the OAuth authorization protocol, designed to verify user identity in addition to granting access to resources, making it essential for B2B authentication needs like single sign-on (SSO). While OAuth enables users to authorize applications to access their data without revealing login credentials, it does not verify user identities, which is where OIDC steps in by providing a standardized method for exchanging identity information. OIDC functions through a three-phase process involving secure connection establishment, user login and consent, and the issuance of bearer tokens such as access tokens for authorization and ID tokens for authentication. By leveraging OAuth's architecture, OIDC supports modern API and mobile application needs, making it suitable for both B2C and B2B authentication models and offering a robust solution for building SSO frameworks.

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