Two-factor authentication

About two-factor authentication

Two-factor authentication (2FA) is a security process in which a second level of authentication is added to the account login credentials. Both factors of authentication must be used and must be entered correctly in order to establish the person's identity beyond doubt. The two factors may include the following:

  • Something that the user possesses, such as a token, card, or key.
  • Something that the user knows, such as an email address, password, or PIN.
  • Something that is inseparable from the user, such as fingerprint, iris, or voice identification.