OAuth 2.0 and OpenID Connect in Cybersecurity - Step-by-Step Execution

Concept Flow - OAuth 2.0 and OpenID Connect

User wants to access app

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App requests permission

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User authenticates with Identity Provider

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Identity Provider issues tokens

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App uses tokens to access resources

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Access granted or denied

This flow shows how a user grants an app permission via OAuth 2.0 and OpenID Connect, allowing secure access to resources.

Execution Sample

Cybersecurity

1. User clicks login on app
2. App redirects to Identity Provider
3. User enters credentials
4. Identity Provider sends tokens to app
5. App uses tokens to get user info

This sequence shows the step-by-step interaction between user, app, and identity provider during login.

Analysis Table

Step	Action	Who	Result	Tokens Issued
1	User clicks login	User	App starts login process	None
2	App redirects to Identity Provider	App	User sees login page	None
3	User enters credentials	User	Identity Provider verifies user	None
4	Identity Provider issues tokens	Identity Provider	Tokens sent to app	Access Token, ID Token (if OpenID Connect)
5	App uses tokens to access resources	App	Access granted to user data	Tokens used
6	Session established	App	User logged in	Tokens stored securely
7	User logs out	User	Tokens revoked or expired	Tokens invalidated

💡 Process ends when user logs out or tokens expire, stopping access.

State Tracker

Variable	Start	After Step 4	After Step 5	Final
Access Token	None	Issued	Used to access API	Expired or revoked
ID Token	None	Issued (OpenID Connect)	Used to get user info	Expired or revoked
User Session	None	Not started	Started	Ended on logout

Key Insights - 3 Insights

Why does the app redirect the user to the Identity Provider instead of asking for credentials directly?

The app redirects to the Identity Provider to keep user credentials safe and centralized. This is shown in execution_table step 2 where the app sends the user to the provider's login page.

What is the difference between Access Token and ID Token?

Access Token allows the app to access user data from APIs, while ID Token contains user identity info for authentication. execution_table step 4 shows both tokens issued, with ID Token specific to OpenID Connect.

How does the app know the user is logged in?

After receiving tokens, the app creates a user session (step 6). This session tracks login state until logout or token expiry.

Visual Quiz - 3 Questions

Look at the execution_table at step 4, which tokens are issued by the Identity Provider?

A Only ID Token

B Only Access Token

C Access Token and ID Token

D No tokens issued

💡 Hint

Check the 'Tokens Issued' column in step 4 of execution_table.

At which step does the app start a user session?

A Step 6

B Step 3

C Step 5

D Step 7

💡 Hint

Look at the 'Result' column in execution_table for when the session is established.

If the user logs out, what happens to the tokens according to variable_tracker?

A Tokens remain valid

B Tokens are expired or revoked

C Tokens are refreshed automatically

D Tokens are sent to the user

💡 Hint

See the 'Final' column for Access Token and ID Token in variable_tracker.

Concept Snapshot

OAuth 2.0 lets apps access user data securely by getting permission via tokens.
OpenID Connect adds user identity info with ID Token.
User logs in via Identity Provider, not app directly.
Tokens grant access and identify user.
Tokens expire or revoke on logout.
Apps use tokens to create user sessions.

Full Transcript

OAuth 2.0 and OpenID Connect work together to let users safely log into apps and share data. The user starts by clicking login in the app, which redirects them to an Identity Provider. The user enters their credentials there, keeping passwords safe. The Identity Provider then sends tokens back to the app. OAuth 2.0 issues an Access Token to allow the app to get user data. OpenID Connect adds an ID Token to confirm who the user is. The app uses these tokens to create a session and grant access. When the user logs out, tokens expire or get revoked, ending access. This flow protects user info and makes login easy and secure.