Spring Security Tutorial Details Refresh Token Implementation to Complement JWT Authentication
A detailed technical guide explains how to enhance JWT-based authentication in Spring Security by introducing refresh tokens for improved security and user experience. The article covers the creation of a RefreshToken entity stored in the database, along with repository and service layers that handle token generation, verification, revocation, and rotation using UUID and expiration timestamps. It discusses security advantages such as short-lived access tokens combined with long-lived refresh tokens hashed via SHA-256 or HMAC-SHA256, while also addressing risks including database theft and XSS attacks mitigated by HttpOnly cookies. Code examples demonstrate updates to AuthService, AuthController, and SecurityConfig to support registration, login, token refresh via cookies, and logout functionality. Additional best practices include automatic token rotation on refresh and session management across multiple devices. The tutorial emphasizes minimizing credential transmission over networks while maintaining stateful token validation.
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