KeeLoq is a cipher used in several car anti-theft mechanisms distributed by Microchip Technology Inc. It may protect your car if you own a Chrysler, Daewoo, Fiat, General Motors, Honda, Toyota, Volvo, Volkswagen, or Jaguar. The cipher is included in the remote control device that opens and locks your car and that activates the anti-theft mechanisms.
Each device has a unique key that takes 18 billion billion values. With 100 computers, it would take several decades to find such a key. Therefore KeeLoq was widely believed to be secure. In our research we have found a method to identify the key in less than a day. The attack requires access for about 1 hour to the remote control (for example, while it is stored in your pocket). Once we have found the key, we can deactivate the alarm and drive away with your car.