Tokens for Authentication
Quick Reference: SSO & OAuth | Encryption
Quick Reference
| Token Type | Use Case | Lifetime | Security |
|---|---|---|---|
| Access Token | API requests | Short (15 min) | High |
| Refresh Token | Get new access token | Long (days) | Very high |
| JWT | Stateless auth | Configurable | Medium |
Clear Definition
Tokens are credentials used for authentication and authorization. JWT (JSON Web Tokens) are self-contained tokens with claims. Refresh tokens are long-lived tokens used to obtain new access tokens.
š” Key Insight: Use short-lived access tokens with long-lived refresh tokens. Store refresh tokens securely.
Core Concepts
JWT Structure
- Header: Algorithm, type
- Payload: Claims (user ID, roles, exp)
- Signature: Verify integrity
Token Flow
- User authenticates
- Server issues access + refresh tokens
- Client uses access token for requests
- When expired, use refresh token for new access token
Best Practices
- Short Expiration: Access tokens expire quickly
- Secure Storage: Store tokens securely (httpOnly cookies)
- HTTPS Only: Always use HTTPS
- Token Rotation: Rotate refresh tokens
Quick Reference Summary
Tokens: Credentials for authentication/authorization.
JWT: Self-contained, stateless tokens.
Refresh Tokens: Long-lived tokens for obtaining new access tokens.
Key: Short-lived access tokens, secure refresh tokens.
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