Patent ID: 8779893

Claim:
A system for controlling vehicle ignition, comprising: a radio frequency identification tag having permanent computer readable memory and volatile computer readable memory associated therewith, the permanent computer readable memory having a predetermined permanently assigned authentication code being stored therein, the volatile computer readable memory having a variable time stamp being stored therein, the tag being configured for transmitting the permanently assigned authentication code and the variable time stamp upon activation of the radio frequency identification tag; a radio frequency transmitter configured for activating the radio frequency identification tag and directing the transmission of the permanently assigned authentication code and the variable time stamp; a radio frequency reader for receiving the permanently assigned authentication code and the variable time stamp transmitted from the radio frequency identification tag, the radio frequency reader being mounted in a vehicle; a clock mounted in the vehicle; vehicle-mounted computer readable memory for storing the permanently assigned authentication code and an access time stamp generated by the clock; means for comparing the permanently assigned authentication code transmitted by the radio frequency transmitter with the permanently assigned authentication code stored in the vehicle-mounted computer readable memory and generating a first authentication signal when the permanently assigned authentication codes match; means for comparing the variable time stamp transmitted by the radio frequency transmitter with the access time stamp stored in the vehicle-mounted computer readable memory and generating a second authentication signal when the variable time stamp and the access time stamp match, the access time stamp representing a previous actuation of ignition of the vehicle; means for actuating ignition of the vehicle when the first and second authentication signals are generated and preventing vehicle ignition unless the first and second authentication signals are generated; and means for updating the variable time stamp and the access time stamp upon ignition of the vehicle.