Fundamentals
How Authentication Works
Understand how websites verify who you are — passwords, sessions, tokens, OAuth, and MFA. Essential knowledge before attacking any auth system.
Beginner35 min9 lessons2 hands-on
Free account. No credit card.
You'll be able to
- ✓Describe session-based and token-based authentication flows
- ✓Understand how cookies are set, scoped, and stolen
- ✓Recognise the difference between authentication and authorisation
- ✓Identify common authentication weaknesses at a glance