A method for authenticating a user device by an authentication computing device is provided. The method includes generating, using the authentication computing device, a locked data file for use in authenticating a user device enrolled in an authentication service, the locked data file is configured to process a challenge and generate a challenge response. The method further includes transmitting the locked data file from the authentication computing device to a first user device as part of the first device enrolling in the authentication service, receiving, at the authentication computing device, an authentication request, generating, using the authentication computing device, the challenge based on the authentication request, transmitting the challenge from the authentication computing device to the first user device, and receiving, at the authentication computing device, the challenge response from the first user device to authenticate the first user device.