# authentication
3 posts
Spring Security — JWT Authentication from Scratch
Implement JWT authentication in Spring Boot 4 with Spring Security 7 — login endpoint, token generation, validation, refresh tokens, and protected routes.
Spring Boot
JWT Deep Dive — Structure, Signing, Validation & Common Mistakes
Understand JSON Web Tokens from the inside — header, payload, signatures, HMAC vs RSA, token validation, refresh strategies, and the mistakes that lead to security breaches.
Security
OAuth 2.0 & OpenID Connect — How Authentication Actually Works
Understand OAuth 2.0 and OpenID Connect from the ground up — flows, tokens, scopes, and how to implement Google/GitHub login in your app without the confusion.
Security