SecurityBeginner
Two-Factor Authentication (2FA)
PronunciationTOO-FAK-ter aw-then-tih-KAY-shun
Definition
Logging in with two proofs: something you know (password) and something you have (a phone code).
Where you hear it
Account security settings.
Examples
Enable two-factor authentication on your GitHub account.
The code expires after 30 seconds.
Common mistake
Sending the code by SMS only. Authenticator apps are safer because SMS can be intercepted.