In short
Authentication factors are categories of proof of identity: something you know (a password), something you have (a phone or token) and something you are (a fingerprint or face).
Key takeaways
- Multi-factor authentication requires factors from two or more different categories.
- A password plus a security question is still a single factor.
- Biometrics can't be changed if compromised, so they are usually combined with other factors.
Where it's tested
ISC: Information Security Fundamentals — study notes, a five-minute revision sheet and practice questions.
Practise: 3 questions
Question 1 of 3 · 0 answered
To send a confidential message that only the intended recipient can read, which key should the sender use to encrypt it?