methods of user authentication

2 factor authentication

a system that requires at least two steps or more to unlock account; each step adds a new layer of security that uses something you have and something you got

Usernames and Passwords

a string of characters that allows access to a computer system or service

token-based authentication

Requires a computer user to physically hold a device called a token.

Biometrics

the identification of a user based on a physical characteristic, such as a fingerprint, iris, face, voice, or handwriting