1. A unit, comprising: a control that receives a verification number from a service provider, the verification number generated in part via an identifier of the unit and without employment of an authentication key table that correlates unit identifiers with authorization keys of the unit; and a processor, operatively connected to the control, the processor facilitates generation of a trial verification number in part based on the verification number, and facilitates comparison of the trial verification number with the verification number, to determine whether a predefined relationship is satisfied, wherein generation of the verification number includes division of a secret code by the identifier of the unit, the generation of the verification number is executed at least in part by a device other than the unit, and the verification number is loaded by the unit.