RSA JWT Authentication in Spring Boot 3 | Production-Ready Security

Build a production-ready JWT system with Spring Boot 3! Learn RSA signing and JWKS public key endpoints. Move beyond simple symmetric keys to an architecture used in professional, scalable applications.

In our previous tutorial, we explored HS256 JWTs. Now, we advance to a more secure and flexible approach using asymmetric keys. This video details how to build a JWT authentication system with RSA and, crucially, how to serve your public key via a standard JWKS (JSON Web Key Set) endpoint.

* 🛠️ In this in-depth tutorial, you will learn how to:*
❓ Understand why asymmetric keys (RSA) are essential for microservices and secure production environments.
🔑 Generate a 2048-bit RSA public/private key pair using OpenSSL.
✍️ Configure your Spring Boot 3 application to sign JWTs using the private key.
🌐 Expose a public JWKS (JSON Web Key Set) endpoint, the standard way for client services to fetch your public key for verification.
🔎 Configure Spring Security's JwtDecoder to use the JWKS URI for automatic token validation.
🗄️ Implement a full authentication flow against user credentials stored in a MySQL database.
🧪 Test the entire system, from logging in to get a token, to accessing protected endpoints, using Postman.

*💻 Technologies Covered:*
* Java ☕
* Spring Boot 3 🌱
* Spring Security (for JWT & JWKS handling)
* RSA (Asymmetric Cryptography)
* JWKS (JSON Web Key Set)
* Spring Data JPA
* MySQL 🐬
* Nimbus JOSE + JWT
* OpenSSL
* Postman 📮

*🧑‍💻 Who is this tutorial for?*
* Java developers building microservices or distributed systems.
* Engineers looking to implement industry-standard, secure JWT authentication.
* Anyone wanting to level up from basic symmetric key JWTs to a more robust architecture.

*🛡️ What's Next?*
With a production-grade authentication system in place, the next step is controlling what authenticated users can do.

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📘 Resources Mentioned:
🧑‍💻 Source Code: https://github.com/learnwithiftekhar/RSA-JWKS-in-Spring-Boot-3-Secure-JWT-the-Enterprise-Way
🔐 Secure 3 Spring Boot endpoints in 30 minutes (free guide): https://learnwithiftekhar.kit.com/secure-your-api-in-30-minutes
Previous Video (HS256 JWTs): [https://www.youtube.com/watch?v=nX66hgUcmS0] ⏮️

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