3 Types of Authentication:

1. Knowledge
2. Ownership
3. Inherence

Access Control Steps (IAAAA)

Authentication Schemes

Ranked from Unsecurest → Securest

1. Basic Authentication
2. One Time Passwords
3. Challenge/ Response
4. Anonymous Key Exchange
5. Zero-Knowledge Passwords
6. Server Certificate + User Authentication
7. Mutual Public Key Authentication

Vulnerability Matrix

1. Basic Authentication

2. One Time Password