A two-step verification plugin using the Time-based One-time Password Algorithm (TOTP), which can be used with an app or service like Google Authenticator. Lightweight and fast: no classes are instantiated until required No reliance or affiliation with any third-party service No setup or config required: immediately enabled for all uses upon plugin activation Automatically throttles multiple failed login attempts Uses filters to allow modifying functionality or output Requires PHP 7 or later Built for WordPress 4.8 or later