Passive remote keyless entry system with time-based anti-theft feature
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United States of America Patent
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Dec 12, 2017
Grant Date -
Jan 15, 2015
app pub date -
Jul 2, 2014
filing date -
Jul 15, 2013
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Abstract
Method for preventing security breaches via the two-thief method of attack of passive remote keyless entry systems for vehicles. The method involves the measurement of air travel time of the RF messages between the RKE fob and the vehicle. Multiple round trips between the fob and the vehicle are employed to magnify the distance covered by the messages and thereby allow accurate measurement of the air travel time.
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