Plaintext/cyphertext pairs are generated for use in authenticating a device. The device performs a secure authentication algorithm on a secure authentication image file and a received plaintext challenge, and outputs a cyphertext response. If the cyphertext response matches a pre-stored cyphertext string associated with the plaintext challenge, then the device is authenticated. A master processor manages the generation of the plaintext/cyphertext pairs. Plaintext challenges are generated in the master processor using a binary counter and an n-bit key. Each plaintext challenge is transmitted to a first processor and a second processor. The first processor executes the secure authentication algorithm on each plaintext challenge and outputs a cyphertext response associated with each plaintext challenge. The second processor executes the secure authentication algorithm on each plaintext challenge and outputs a second cyphertext response associated with each plaintext challenge. The master processor receives the first and second cyphertext responses for each plaintext challenge. If the first cyphertext response matches the second cyphertext response, then the master processor stores each plaintext challenge and the associated cyphertext response as a vector pair in a database.