Strong Multi-Factor Authentication
Traditional One-Factor Authentication
Multi-Factor Authentication (M-FA)
Authentication protocol requiring minimum two independent ways to establish identity and privileges
M-FA sometimes includes Single-Sign-On or 1-time passwords / "Something you create" only valid for limited time period (time factor)
"Something you know": Password, PIN, Birthday etc.
"Something you are": Biometrics (fingerprint, iris, hand geometry), Behaviour patterns
-> Strong Authentication