SV-2FA: Two-factor user authentication with SMS and voiceprint challenge response

Two-step authentication, which uses SMS or voice calls, is becoming more practical for user authentication or for preventing phishing attack. However, conventional methods have vulnerabilities to man-in-the-middle or social-engineering attack or cell phone theft. As a general problem, it is difficult to prevent a legitimate user´s denial. Therefore, we propose a secure user authentication method that uses a onetime phone number sent by SMS and oath and voiceprint authentication through voice calls. This method solves the above-mentioned problem and is easy to use since it can be used with any cell phone.