RSA Encryption and Decryption in Spring Boot: A Practical Guide

In this article the author introduces RSA asymmetric encryption and signing, explains its principles, and demonstrates how to secure Spring Boot API responses by automatically encrypting and decrypting data using annotations.

The tutorial covers project setup, Maven dependencies, adding @EnableSecurity, configuring RSA public and private keys in application.yml, and applying encryption to controller methods.

It also shows how to implement decryption on the client side with JavaScript using jsencrypt, providing the required script tags:

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>

<script src="https://cdn.bootcdn.net/ajax/libs/jsencrypt/3.0.0-rc.1/jsencrypt.js"></script>

Step‑by‑step screenshots illustrate the code and configuration files.

Finally, the author discusses practical considerations such as setting contentType: "application/json;charset=utf-8", using @RequestBody for decryption methods, and common pitfalls, concluding that RSA protects API data from interception and tampering.