Two-Factor Authentication
A security process requiring two different verification factors to access an account or system.
Also: 2FA
Definition
Two-Factor Authentication (2FA) is a security mechanism that requires users to provide two distinct forms of verification before gaining access to an account — typically something they know (password), something they have (phone or hardware token), or something they are (biometric). 2FA significantly reduces the risk of account compromise even if a password is stolen, as attackers also need the second factor. Common 2FA methods include SMS codes, authenticator apps (TOTP), and hardware keys (FIDO2).
Example
“After entering your password to log into Gmail, you receive a six-digit code on your phone that you must also enter to complete the login.”
Synonyms
- 2FA
- dual-factor authentication
- two-step verification
Antonyms / Opposites
- single-factor authentication
- password-only access
Images
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Related Terms
- mfa
- authentication
- password
- sso