Secure system for the control of the unlocking of at least one openable panel of a motor vehicle
First Claim
1. System for the control of means for locking/unlocking at least one openable panel of a vehicle, in particular an automobile, comprising transmission/reception means (3, 4, 5) and memory means (7) which are carried by the vehicle and transmission/reception means (9, 10, 11) and memory means (13) which are intended to be carried by a user, the transmission/reception means of the vehicle (3, 4, 5) forming a circular shift register in which is stored a pseudo-random code and comprising means (3, 6, 7) for transmitting an interrogation signal which carries such a pseudo-random code, the transmission/reception means of the user (9, 10, 11) comprising means (12, 13, 14) for de-spreading the signal received if the pseudo-random code carried by the said signal is synchronized with a corresponding pseudo-random code stored in their memory means (13) and being intended to transmit a response signal able to control the actuation of the unlocking of the openable panel, characterized in that the memory means (13) and the transmission/reception means (9, 10, 11) of the user form a circular shift register and furthermore comprise means (9, 12, 13, 14) for transmitting a signal in response which signal carries a pseudo-random code and a signature which is specific to the said transmission/reception means (9, 10, 11) of the user, the transmission/reception means (3, 4, 5) on the vehicle comprising means (6, 7, 8) for de-spreading the signal received if the pseudo-random code carried by the said response signal is synchronized with a corresponding pseudo-random code stored in their memory means (7) and for verifying whether the signal received carries the signature of the transmission means.
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Abstract
The invention concerns a system for controlling means for locking/unlocking at least a vehicle opening panel, in particular a motor vehicle, comprising transmission/reception means on-board the vehicle and transmission/reception means to be carried by the user and which, on receiving an interrogation signal transmitted by the vehicle transmitting/receiving means, are designed to transmit a reply signal capable of actuating the unlocking of the opening panel. The invention is characterised in that the transmission/reception means on-board the vehicle and the user transmission/reception means comprise each storage means forming a cyclic shift register wherein are stored at least a common pseudo-random code, the on-board transmission/reception means comprising means for transmitting an interrogation signal bearing said pseudo-random code, the user transmission/reception means comprising means for despreading the received signal if the pseudo-random code borne by said signal is synchronised with a corresponding pseudo-random code stored in the storage means and further comprising means for transmitting a reply signal bearing a pseudo-random code and which further bears a signature which is specific to said user transmission/reception means, the on-board transmission/reception means comprising means for despreading the received signal if the pseudo-random code is synchronised with a corresponding pseudo-random code stored in their storage means and for verifying whether the received signal bears the signature of the user transmission/reception means.
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Citations
11 Claims
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1. System for the control of means for locking/unlocking at least one openable panel of a vehicle, in particular an automobile, comprising transmission/reception means (3, 4, 5) and memory means (7) which are carried by the vehicle and transmission/reception means (9, 10, 11) and memory means (13) which are intended to be carried by a user, the transmission/reception means of the vehicle (3, 4, 5) forming a circular shift register in which is stored a pseudo-random code and comprising means (3, 6, 7) for transmitting an interrogation signal which carries such a pseudo-random code, the transmission/reception means of the user (9, 10, 11) comprising means (12, 13, 14) for de-spreading the signal received if the pseudo-random code carried by the said signal is synchronized with a corresponding pseudo-random code stored in their memory means (13) and being intended to transmit a response signal able to control the actuation of the unlocking of the openable panel,
characterized in that the memory means (13) and the transmission/reception means (9, 10, 11) of the user form a circular shift register and furthermore comprise means (9, 12, 13, 14) for transmitting a signal in response which signal carries a pseudo-random code and a signature which is specific to the said transmission/reception means (9, 10, 11) of the user, the transmission/reception means (3, 4, 5) on the vehicle comprising means (6, 7, 8) for de-spreading the signal received if the pseudo-random code carried by the said response signal is synchronized with a corresponding pseudo-random code stored in their memory means (7) and for verifying whether the signal received carries the signature of the transmission means.
Specification