Intermediate~4h
Security & Auth in System DesignInterview Readiness Check
Authentication, authorization, OAuth, JWT, common attacks and defenses.
securityoauthjwtauthenticationauthorizationxsscsrfsql-injectionrbac
Learning path
Try a sample question
What is the difference between hashing and encryption?
A.Hashing is faster; encryption is more secure
B.They are the same — both protect data
C.Hashing is one-way and irreversible; encryption is two-way and can be decrypted with a key
D.Encryption is for passwords; hashing is for network traffic
Sign up free to take the full check and see the answer with an explanation.
What this module tests
- Conceptual understanding of security & auth fundamentals
- Trade-offs and design decisions in real system scenarios
- security and oauth — applied knowledge
- Interview-style reasoning and explanation quality
Free to start
Take the Security & Auth check →
10 questions · Dimension scoring · AI coach feedback · Shareable result
Test your knowledge — free →No credit card · Takes 10–15 min
Frequently asked questions
- What does the Security & Auth check test?
- The check covers authentication, authorization, oauth, jwt, common attacks and defenses. Questions span beginner to advanced difficulty and test both conceptual understanding and practical trade-off reasoning.
- What keywords should I know for Security & Auth?
- Key concepts include: security, oauth, jwt, authentication, authorization, xss, csrf, sql-injection, rbac. These frequently appear in system design interviews at product and infrastructure companies.
- How many questions are in the check?
- Each check has 10 questions — a mix of MCQ and short-answer. You get scored by dimension (e.g., scalability, consistency) so you know exactly where to focus.
- How long does it take to study Security & Auth?
- Most engineers spend around 4 hours on this module. The check itself takes about 10–15 minutes. You can retake it up to 3 times per day.
- What prerequisite knowledge do I need before Security & Auth?
- Security & Auth builds on Fundamentals and API Design. Complete those first for the best results.
- Is security, oauth, jwt covered?
- Yes. The Security & Auth module covers security, oauth, jwt among other key concepts. The check includes questions that reflect real system design interview patterns.