A system for utilizing a mobile device as a computer authenticator is provided. The system may include a computing application executing on a computing apparatus. The system may include a secure backend server. The secure backend server may include a list of user identifiers, token serial numbers, device registration numbers and computing device identifiers. A pre-registration process may be used to embed a mobile token on a mobile device. A registration process may be used to pair the mobile device to the computing device. An in-use process may be used to authenticate the computing application using the mobile device.