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🔐 Complete Spring Security 6 Tutorial

Welcome to the Ultimate Spring Security 6 Full Course.
In this complete tutorial, we go step by step — from understanding how Spring Security works internally to implementing modern authentication and authorization mechanisms used in real-world applications.

This is not just configuration — we focus on architecture, filter chain flow, authentication processing, and production-ready security design.

1️⃣ Form-Based Authentication (Session Authentication)

We begin with default form login and session-based authentication.
You’ll understand how Spring Security automatically secures your app, how JSESSIONID works, how sessions are created, and how authentication is maintained using cookies.

We also deep dive into:

SecurityFilterChain
UsernamePasswordAuthenticationFilter
AuthenticationManager & AuthenticationProvider
DaoAuthenticationProvider

This builds your core foundation of how authentication works internally.

2️⃣ CSRF (Cross-Site Request Forgery)

Next, we understand how CSRF attacks happen in real browser scenarios and why session-based applications are vulnerable.

You’ll learn:

How CSRF exploits cookies
Why it affects POST/PUT/DELETE requests
How Spring Security generates and validates CSRF tokens
How CSRF protection works behind the scenes

This section helps you think like a security engineer.

3️⃣ Basic Authentication (Stateless Authentication)

We then move to Basic Authentication and understand stateless security.

You’ll learn:

How Base64 credentials are sent in headers
Basic vs Session authentication
Custom SecurityFilterChain configuration
Database integration with UserDetailsService
PasswordEncoder & BCrypt
Secure password storage
Custom login & UserDetails implementation

This clarifies authentication strategies for REST APIs.

4️⃣ JWT Authentication (Token-Based Security)

Now we implement production-ready JWT authentication.

You’ll understand:

JWT structure (Header, Payload, Signature)
Claims, expiration & signature verification
JWT vs Session vs Basic
Creating token generation APIs
Implementing a custom JWT filter
Setting authentication in SecurityContext
End-to-end stateless authentication flow

This section prepares you for real-world API security.

5️⃣ Authorization (Roles & Permissions)

Authentication verifies identity. Authorization controls access.

Using a Hotel Management example, we implement:

Role-Based Access Control
Permission-Based Authorization
hasRole vs hasAuthority
GrantedAuthority
@PreAuthorize & @PostAuthorize
AuthorizationManager internals
Storing roles inside JWT

You’ll learn how to design scalable authorization systems.

6️⃣ OAuth 2.0 (Google Login Implementation)

Finally, we deeply understand OAuth 2.0 using a real-world Google login example.

You’ll learn:

OAuth 2.0 architecture (Client, Authorization Server, Resource Server)
Authorization Code flow
Scope, state parameter, redirect URI
Access token generation
Implementing OAuth2 login in Spring Boot
Integrating Spring Security 6 with Google

This gives you both conceptual clarity and hands-on implementation.

By the end of this course, you’ll have a strong foundation in Spring Security 6 — from session-based authentication to JWT and OAuth2 — with a clear understanding of how everything works internally.

If you're serious about mastering Spring Security, this complete tutorial will give you the clarity and confidence you need. 🔐

00:00:00 : Introduction
00:01:12 : Form and Session Based Authentication
00:26:24 : CSRF Attack & CSRF Token
00:45:24 : Basic Auhentication
01:26:29 : JWT (JSON Web Token)
02:13:12 : Authorization (Roles & Permissions)
03:04:23 : OAuth 2.0

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