Motor vehicle engine immobilizer security system and method

Details Motor vehicle engine immobilizer security system and method Motor vehicle engine immobilizer security system and method

2006-04-25

2006-04-25

Horabik, Michael (Department: 2635)

Communications: electrical

Selective

Intelligence comparison for controlling

C340S005310, C340S005720, C340S426110, C708S250000, C708S252000, C307S010700

Reexamination Certificate

active

07034654

ABSTRACT:
Methods and apparatus are provided for insuring that a motor vehicle is being operated by an authorized operator. The apparatus includes an electronic control unit (ECU), an engine immobilizer unit, and a shared encryption key. The ECU generates a challenge by combining the output of a pseudo-random number generator and the output of a somewhat random number generator and cycling the combined number through a linear feedback shift register. The ECU sends the challenge to the immobilizer unit where it is encrypted with the shared key and sent back to the ECU as a response. The ECU uses the same key to encrypt the challenge and compares the encrypted challenge to the response. If the response matches the encrypted challenge, engine operation is enabled.

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