Security process of a communication for passive entry and start system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Dec 6, 2001
app pub date -
Jun 20, 2001
filing date -
Apr 18, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The process for securing a communication between a recognition device and an identification unit able to communicate with the recognition device by a data exchange determined by a recognition protocol, one of these items of data corresponding to a reference event, the process communicating in such a way that the recognition device can authenticate the identification unit so as to instruct the unlocking of openable panels of a vehicle and/or permit the starting of a vehicle and furthermore comprising: after an initialization time defined with respect to the reference event of the recognition protocol, a step of transmission by the recognition device of at least two transmission data, a step of transmission by the identification unit of at least two response data in response to the transmission data, a step of measuring a reaction time between the transmission of a data item and the reception of a corresponding response data item by the recognition device, and a step of verifying that the measured reaction time is less than a predetermined threshold wherein the time interval between the transmission of two successive transmission data and/or the initialization time are/is made to vary randomly.
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