Two-factor authentication

Security systems.

(2FA).

Two-factor authentication is a principle of security systems requiring additional features on top of standard usernames and passwords.

The additional features may be something you:

• Know: for example, a personal identification number (PIN), an additional password, answers to “secret questions” or specific keystroke patterns
• Have: for example a credit or debit card, a smartphone, or a small hardware token
• Are: for example, a fingerprint, iris scan, or voice print

See also

• Behavioural analytics
• Biometric recognition