Auth Attacks
Common Attacks
| Attack | Description | Defense |
|---|---|---|
| Brute Force | Guess passwords | Rate limiting, lockout |
| Credential Stuffing | Use leaked passwords | Monitor, enforce strong passwords |
| Session Fixation | Force known session ID | Regenerate session on login |
| Token Theft | Steal JWT/session | HttpOnly, HTTPS, short expiry |
Key Points
- Understanding Auth Attacks is essential for production systems
- Always consider scalability and maintainability
- Test thoroughly before deploying to production
- Monitor performance and set up alerting
Common Patterns
- Validation: Always validate input at the boundary
- Error Handling: Use structured error responses
- Logging: Log key events for debugging
- Testing: Unit, integration, and load tests
- Documentation: Keep docs updated with code changes
Best Practices
Security Best Practices
- Password Storage: Use bcrypt/scrypt with salt
- Token Management: Short-lived access tokens (15-30 min)
- HTTPS: Enforce TLS everywhere
- Rate Limiting: Prevent brute force attacks
- Input Validation: Never trust user input
Implementation Checklist
- Hash passwords with bcrypt (cost factor 12+)
- Implement token refresh flow
- Add CSRF protection
- Log authentication events
- Use secure session management
Key Points
- Understanding Auth Attacks is essential for production systems
- Always consider scalability and maintainability
- Test thoroughly before deploying to production
- Monitor performance and set up alerting
Common Patterns
- Validation: Always validate input at the boundary
- Error Handling: Use structured error responses
- Logging: Log key events for debugging
- Testing: Unit, integration, and load tests
- Documentation: Keep docs updated with code changes
Practice Problems
Design and implement a solution for Auth Attacks in a backend system. Consider scalability, error handling, and production readiness.
Solution
// Auth Attacks implementation
// Key aspects: validation, error handling, logging, testing
public class AuthAttacks {
// Production-ready implementation
}Identify and handle edge cases for Auth Attacks. What happens under high load, with invalid input, or during failures?
Solution
// Edge case handling:
// 1. Null/empty input -> validation
// 2. High load -> rate limiting, queuing
// 3. Failures -> retries, circuit breaker
// 4. Concurrent access -> locks, idempotencyWrite a testing strategy for Auth Attacks. Include unit tests, integration tests, and performance tests.
Solution
// Test plan:
// - Unit: 80% coverage target
// - Integration: API contracts
// - Performance: latency, throughput
// - Chaos: failure injectionQuiz
1. Credential stuffing uses?
2. Prevent brute force with?
3. What is the primary purpose of Auth Attacks?
4. What is a common mistake when implementing Auth Attacks?
Flashcards
Question
Credential stuffing?
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Answer
Using leaked credentials from other breaches
Question
Brute force prevention?
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Answer
Rate limiting and account lockout
Question
What is Auth Attacks?
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Answer
Auth Attacks is a key concept in backend development.
Question
When to use Auth Attacks?
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Answer
Use Auth Attacks when building production systems that require reliability, scalability, and maintainability.
Question
Auth Attacks best practices
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Answer
Follow SOLID principles, write clean code, test thoroughly, document decisions, and monitor in production.
Revision Notes
Key Takeaways
- 1.Brute force: rapid guessing, prevent with rate limiting
- 2.Credential stuffing: leaked passwords
- 3.Session fixation: regenerate on login
- 4.Token theft: HttpOnly, HTTPS, short expiry
Interview Tips
- •Know auth attack types
- •Implement defenses
Cheat Sheet
Auth Attacks
- Brute Force: rate limiting
- Credential Stuffing: leaked passwords
- Session Fixation: regenerate session
- Token Theft: HttpOnly, HTTPS