The Car and Truck Fleet and Leasing Management Magazine

Triple RFID Immbolizer Protection to Thwart Vehicle Thieves

January 4, 2005

BURNSVILLE, MN — To decrease the chances of automotive theft, a new automobile immobilizer system uses three radio frequency identification (RFID) readers to make it three-times harder for prospective thieves to start a car's engine, according to the magazine, RFID Journal. Released in December by Northland Auto Enterprises, Burnsville, Minn., the new system, named TheftStopper1, is being sold as an aftermarket device installed by car dealerships or independent auto mechanics. RFID security systems installed in new vehicles by car manufacturers have succeeded in reducing car thefts, according to statistics gathered by immobilizer manufacturers. These RFID security systems work by fitting a car's ignition key with a passive RFID transponder containing a unique ID code. Whenever the key is inserted into the ignition switch, it activates an RFID reader connected to a control module in the engine's central computer (which controls such things as the car's ignition and fuel systems) and is wired to an antenna built into the vehicle's steering column. The RFID reader generates a random number, which is transmitted to the key. The key's transponder combines the random number with its own unique serial number, encrypts the new number and transmits it back to the car's RFID reader. If the numbers don't match, the car won't start. Thieves, however, have found several ways around those systems, according to Dan Beach, director of new product development for C-Chip Technologies, a Montreal security systems provider that developed TheftStopper1. Some experienced thieves can locate the RFID unit, override it and drive away with the vehicle in a matter of minutes. Thieves can use a simple resistor to bypass some RFID security systems, while most factory-installed RFID immobilizers require the use of a module, in order to "talk" to the onboard computer, Beach says. Instead of using a passive RFID tag embedded in the ignition key, the TheftStopper1 system uses a key fob containing an active RFID transponder that transmits a signal containing a unique ID code over a distance of up to 20 feet. The key fob is comprised of a miniature OEM transmitter module powered by a small lithium button battery. TheftStopper1's three RFID readers each have a nanowatt microcontroller and relay. One of the RFID readers serves as the starter cutoff, or "mother," unit. The mother unit controls the power to the two other control units installed elsewhere in the car. Each of the other two units functions as a power switch to a different part of the car, such as the fuel pump, ignition circuit, computer, or transmission relay. When equipped with TheftStopper1, a car won't start unless all three control units receive a signal from a key fob containing the correct ID code. Because the key fob's active transponder can transmit its signal over a distance of 20 feet, the mother unit communicates with the key fob, well before the driver even starts the vehicle, and verifies that the key fob's ID code matches the one programmed in the mother unit. When the driver turns the ignition switch, a second connection is made between the mother unit and the two other units and the engine starts. Without the key fob's transponder, none of the three cut-off switches will allow electric current to flow to their respective devices (the car's fuel pump, ignition circuit, computer or transmission relay). For that reason, a thief who manages to hotwire one cut-off switch and thereby override it, will still not be able to start the car. That's because the two other units will still lock down the engine without a signal from the proper key fob or the mother unit. The additional time necessary to locate and bypass all three units will be enough to discourage most thieves, says Allen Lentsch, CEO and president of Northland Dealers. Lentsch admits, however, that a thief who succeeded in overriding all three control units could start the car. If they lose their key fob, car owners can always start their car as long as they know the code for the TheftStopper1 system installed in their vehicle. Each TheftStopper1 system comes with a "bypass card" printed with the system code. The driver can enter the code by turning the ignition switch from the "off" position to the "accessory" position and back to "off," in response to beeps coming from the mother reader module. Once the code is properly entered, the driver has the option to allow up to 10 authorized starts for servicing purposes. Car dealers throughout the United States have already deployed Theftstopper1, according to Lentsch, who hopes to sell the system also to automotive stores. The system retails at $279 and installation will cost between $35 and $75, Lentsch estimates. Most car owners would not be able to install it themselves.
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