What is Two-Factor Authentication (2FA)? - Definition & Meaning
Two-factor authentication (2FA) is a security method that requires two forms of identification to log in. Learn how 2FA protects your account.
Definition
Two-factor authentication (2FA) is a security method where users must provide two different forms of identification to access an account or system. This typically combines something you know (password) with something you have (phone) or something you are (biometrics).
Technical Explanation
Authentication factors are categorized as: knowledge (password, PIN), possession (phone, hardware key), and inherence (fingerprint, facial recognition). TOTP (Time-based One-Time Password) generates codes that change every 30 seconds via apps like Google Authenticator. FIDO2/WebAuthn standards support hardware security keys (YubiKey) and passkeys. SMS-based 2FA is vulnerable to SIM-swapping and is discouraged in favor of authenticator apps or hardware keys. Multi-factor authentication (MFA) extends the concept to three or more factors. Backup codes serve as a recovery method when the second factor device is lost.
How Refront Uses This
Refront offers 2FA as a standard security option for all user accounts. Users can configure TOTP authenticator apps or hardware security keys. For organizations with elevated security requirements, 2FA can be made mandatory through team management. Administrators can see in the dashboard which team members have activated 2FA.
Examples
- •A user logs in with their password and then enters a 6-digit code from the Google Authenticator app.
- •The team administrator makes 2FA mandatory for all team members to ensure the security of the agency account.
- •A login attempt from an unknown device triggers an additional 2FA verification as an extra security layer.
Frequently Asked Questions
Why is 2FA important?
Passwords alone are vulnerable to phishing, brute force, and data breaches. 2FA adds an extra layer so even if a password is stolen, an attacker cannot gain access without the second factor device.
What if I lose my 2FA device?
Most systems provide backup codes when setting up 2FA. Store these in a safe place. Without backup codes, you need to contact the administrator who can reset the 2FA profile after identity verification.
Is SMS-based 2FA secure?
SMS-based 2FA is better than no 2FA but is vulnerable to SIM-swapping attacks. Authenticator apps (Google Authenticator, Authy) or hardware keys (YubiKey) provide a significantly higher security level.
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