Embodiments of the invention provide a method a authenticating a transaction at the point of transaction. In some embodiments of the invention, a unique signature is created based at least in part on a hardware profile of the system. In some embodiments, a request is received from a user to perform a transaction using the system. In some embodiments, in response to receiving the request a key is created based on the unique signature and displayed to the user. In some embodiments, user input entered in response to the user viewing the key is received and it is determined whether to proceed with transaction payment authentication based at least on whether the received user input matches the created key.