MFA (Multi-Factor Authentication)
A security mechanism that requires users to provide two or more verification factors to gain access.
Types of Authentication Factors
- Something You Know: Passwords, PINs, security questions
- Something You Have: Phone, hardware token, smart card
- Something You Are: Fingerprint, face recognition, voice
Common MFA Methods
- Authenticator apps (TOTP)
- SMS or email codes
- Hardware security keys (FIDO2/WebAuthn)
- Biometric verification
- Push notifications