Spring Full-Stack Practical Cases

Jun 20, 2026 · Backend Development

No Third‑Party Dependencies: Build a Custom Spring Boot Dynamic Decryption Component

The article explains how to protect database passwords and API keys in Spring Boot 3.5.0 by implementing a lightweight, third‑party‑free dynamic decryption component that encrypts values with AES, stores them with a {cipher} prefix, and decrypts them at pre‑refresh using a custom ApplicationContextInitializer.