Three common ways to authenticate a person:
- Something you know (E.g. Password)
A user must know in order to login: ID, Password, PIN.
- Something you have (E.g.Token)
Anything a user must have in his possession to log in: One time password (OTP tokens), smartphones with OTP Apps, Employee ID card.
- Something you are (E.g. Fingerprint/Bio metric)
Biological traits a user has that are confirmed for log in: Retina scan, Fingerprint scan, Facial recognition, Voice recognition.