What is OpenID Connect?
Blog post from Postman
OpenID Connect (OIDC) is an authentication protocol that builds on OAuth 2.0 by adding an identity layer, which facilitates secure user authentication and enables applications to obtain user information from identity providers. Often used in Single Sign-On (SSO) scenarios, OIDC allows users to log in once to access multiple applications, addressing a limitation of OAuth 2.0, which focuses on authorization rather than authentication. OIDC operates through key components such as Identity Providers, Relying Parties, and ID Tokens, and involves a detailed workflow that includes client registration, authentication requests, and token exchanges. The protocol offers several benefits, including enhanced security, reduced friction for user onboarding, and the ability to keep user information up-to-date across platforms. However, challenges such as dependency on third-party identity providers, privacy concerns, and implementation complexities must be navigated. Best practices for using OIDC include utilizing the authorization code flow with PKCE for security, validating ID Tokens, allowing users to revoke client authentication, and implementing robust logging and monitoring.
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