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auth-security

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OAuth 2.1 + JWT authentication security best practices. Use when implementing auth, API authorization, token management. Follows RFC 9700 (2025).

skills/auth-security/SKILL.md

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# Auth Security

## Core Principles

- **OAuth 2.1** — Follow RFC 9700 (January 2025)
- **PKCE Required** — All clients must use PKCE
- **Short-lived Tokens** — Access tokens expire in 5-15 minutes
- **Token Rotation** — Refresh tokens are single-use
- **HttpOnly Storage** — Browser tokens in HttpOnly cookies
- **Explicit Algorithm** — Never trust JWT header algorithm
- **No backwards compatibility** — Delete deprecated auth flows

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## OAuth 2.1 Key Changes
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