OAuth2 Explained: OpenID Connect, Login with Google & SSO for Beginners
OAuth2 and OpenID Connect (OIDC) power modern login systems like “Login with Google.” But how does OAuth2 actually work — and how does OIDC extend it for authentication and identity?
In this beginner-friendly video, we explain how OAuth2 enables secure authorization without sharing passwords, and how OpenID Connect adds identity to support federated login and single sign-on (SSO).
🔐 What You’ll Learn:
OAuth2 explained with real-world login examples
OpenID Connect explained (OIDC workflow step-by-step)
How federated identity and SSO work
What “Login with Google” really does behind the scenes
Tokens, scopes, consent, identity provider, and authorization server roles
Why OpenID Connect builds on OAuth2 — not replaces it
Whether you're building secure apps or just curious about how modern logins work, this video gives you the full picture — with real-world context and no jargon.
📺 This is Part 4 of our How the Internet is Secured series — designed to take you from web security fundamentals to advanced real-world systems.
Full Playlist: • How the Internet Is Secured: HTTPS, TLS, O...
▶️ Next in the series: • How OAuth2 Works: Authorization Flows & To...
▶️ Chapters:
00:00 Introduction
00:17 Agenda
00:38 Early days of security and requirement for authentication services
03:35 Problem of excess access
05:11 Rise of authentication and authorization services
06:08 Useful definitions in context of authentication and authorization
07:46 OpenID Connect (OIDC)
08:27 OAuth2 introduction
09:15 Benefits and Satellite view of OIDC
11:07 How OpenID Connect works (Detailed overview of workflow)
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