Authentication System Production-grade authentication and authorization implementation. Authentication Strategies 1. JWT (Stateless) 2. Session-Based (Stateful) 3. OAuth2 (Social Login) Authorization (RBAC) Password Security 2FA (TOTP) Security Best Practices Scripts - - Generate secure JWT secret - - CLI tool to hash passwords - - Decode and verify JWT tokens References - - OAuth2 provider setup guides - - Auth security audit checklist - - Refresh token rotation patterns ---