OpenID Connect Explained: Identity on Top of OAuth 2.0
How OIDC extends OAuth with identity: the ID token, UserInfo endpoint, discovery document, and login flow walkthrough.
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Tags: security, authentication, oauth
OpenID Connect Explained: OAuth 2.0 for Authentication OAuth 2.0 is a framework for authorization — "this app can access your Google Drive files." It says nothing about who you are. OpenID Connect (OIDC) layers authentication on top: "you are who you say you are, and here's a token that proves it." Understanding the distinction is more than academic — it determines what tokens you use for what purpose and how you implement authentication securely. Why OAuth 2.0 Alone Isn't Authentication OAuth 2.0 is designed around resource access delegation. When you authorize an app to access your Google Calendar, you're granting it permission to read/write your calendar data. The app receives an access token — a credential that says "this app is allowed to access the Google Calendar API on behalf of…
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