Two-factor authentication means that you must have two factors, to access your account. The first factor is something you know, like your login and password combination. The second is something you have, like a mobile device with a security app installed. That second factor — the mobile device with a security app — adds an extra layer of protection to your account. Even if hackers steal your password, they can’t log in, because they don't have your mobile device. Try 2FA on our SANDBOX environment! It is the most popular 2FA option based on Times-based One-Time Password (TOTP) alghoritm described in RFC 6238 and RFC 4226. TOTP is supported by Google Authenticator, Microsoft Authenticator, Authy 2-Factor Authentication and many other mobile apps. The most popular online services like Facebook, Google, Twitter use TOTP to protect user's accounts. TOTP is a standard algorithm based on cryptographic hash method SHA-1. SHA-1 algorithm's implementation is available sin...