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Two-Factor Authentication (2FA)
Authentication
Authentication using two independent factors.
Definition
Two-factor authentication is a subset of multi-factor authentication that requires exactly two distinct factor categories (knowledge, possession, or inherence) during login or sensitive actions.
In plain English
Authentication using two independent factors.
Why this matters
Why it matters: It reduces account takeover risk by preventing password-only compromise from granting access.
Example
Example: Password (knowledge) + TOTP code from a registered device (possession).
Apps Using Two-Factor Authentication (2FA)
Examples of apps that implement or relate to this privacy concept
