In general terms, what are four means of authenticating a user's identity?
Something the individual knows: Examples includes a password, a personal identification number (PIN), or answers to a prearranged set of questions. Something the individual possesses: Examples include electronic key-cards, smart cards, and physical keys. This type of authenticator is referred to as a token. Something the individual is (static biometrics): Examples include recognition by fingerprint, retina, and face. Something the individual does (dynamic biometrics): Examples include recognition by voice pattern, handwriting characteristics, and typing rhythm.