LogMeOnce Two-Factor Authentication (2FA) is a multi-method authentication solution that adds a second layer of identity verification on top of a standard password. It is designed to reduce reliance on single-password security by requiring users to present two distinct pieces of identification before access is granted. **Authentication Methods Supported:** - Selfie-2FA (patent-pending image-based authentication) - SMS message (OTP delivery) - Voice call (OTP delivery) - Email message (OTP delivery) - Google Authenticator (TOTP) - USB Token - X.509 Certificate **One-Time Password (OTP):** OTPs delivered via SMS, voice, or other channels are valid for 3 minutes and for a single login session only, ensuring they cannot be reused. **Selfie-2FA:** A proprietary method where an actual image or photo is delivered as the second authentication factor rather than a numeric token. This eliminates the need for hardware dongles and reduces friction in the authentication process. **PhotoLogin:** An automatic 2FA feature that captures a photo on the user's desktop and sends it to a trusted iOS or Android mobile device. The user approves or rejects access directly from the mobile app. **Encryption:** The product operates with AES military-grade encryption and a 26-layer encryption method, with the encryption key held solely by the user. **SDK Availability:** A Software Development Kit (SDK) is available for developers seeking to integrate LogMeOnce 2FA into their own applications. The service is available for both personal and business use, with a free tier offered for both segments.