Master authentication and authorization patterns including JWT, OAuth2, session management, and RBAC to build secure, scalable access control systems. Use when implementing auth systems, securing APIs, or debugging security issues.
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What the file says
# Authentication & Authorization Implementation Patterns
Build secure, scalable authentication and authorization systems using industry-standard patterns and modern best practices.
## When to Use This Skill
- Implementing user authentication systems
- Securing REST or GraphQL APIs
- Adding OAuth2/social login
- Implementing role-based access control (RBAC)
- Designing session management
- Migrating authentication systems
- Debugging auth issues
- Implementing SSO or multi-tenancy
## Core Concepts
### 1. Authentication vs Authorization
**Authentication (AuthN)**: Who are you?
- Verifying identity (username/password, OAuth, biometrics)
- Issuing credentials (sessions, tokens)
- Managing login/logout
**Authorization (AuthZ)**: What can you do?
- Permission checking
- Role-based access control (RBAC)
- Resource ownership validation
- Policy enforcement
### 2. Authentication Strategies
**Session-Based:**
- Server stores session state
- Session ID in cookie
- Traditional, simple, stateful
**Token-Based (JWT):**
- Stateless, self-contained
- Scales horizontally
- Can store claims
**OAuth2/OpenID Connect:**
- Delegate authentication
- Social login (Google, GitHub)
…
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GET https://markdownregistry.com/api/v1/resolve?ref=hermeticormus/libreuiux-claude-code/auth-implementation-patterns
GET https://markdownregistry.com/api/v1/blob/bbc8c8de4a53d0c99146bb56492b0842a7f049d234cf5628481bc16e5637901b
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