소개
Provides comprehensive guidance and production-ready code patterns for building secure, scalable access control systems. This skill covers a wide spectrum of authentication strategies—from stateless JWTs with refresh token flows to stateful session management—alongside advanced authorization models like Role-Based Access Control (RBAC) and resource ownership validation. It is designed to help developers secure REST or GraphQL APIs, integrate social logins, and apply critical security best practices like robust password hashing and middleware-level permission checking.