Integrated remote keyless entry and ignition disabling system for vehicles, using updated and interdependent cryptographic codes for security
First Claim
1. A remote-control unit for vehicles, incorporated in a key to be fitted into a key cylinder for starting an engine of a vehicle, for communicating with said vehicle, comprising:
- a reception circuit for receiving a cryptographic code transmitted from said vehicle when said key is fitted into said key cylinder;
a memory circuit for storing said cryptographic code;
a manual switch to be handled by a user;
a control circuit for producing a first cipher system code responsively to reception of said cryptographic code, and producing a second cipher system code responsively to handling of said manual switch, wherein said control circuit produces said second cipher system code, which is different for each communication, on the basis of said cryptographic code stored in said memory circuit; and
a transmission circuit for transmitting said first and second cipher system codes in the form of radio waves to said vehicle,wherein said first cipher system code contains a command for permitting engine start for said vehicle; and
said second cipher system code is produced on the basis of a cryptographic code existent in said memory circuit and contains a command for closing or opening the door lock of said vehicle.
1 Assignment
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Accused Products
Abstract
A remote-control unit for vehicles in which an immobilizer facility and keyless entry facility are united to enable bidirectional transmission. Further, a cost reduction is achieved by decreasing the number of parts, and labor required for maintenance is diminished. A remote-control unit for vehicles includes a circuit 16 for receiving a cryptographic code CR from a vehicle when a key 10 is fitted into a key cylinder 21, a circuit 17 for storing a cryptographic code, a control circuit for producing a first cipher system code CS1 in response to a cryptographic code, and producing a second cipher system code CS2 in response to actuation of a manual switch 12, and a transmission circuit 15 for transmitting the cipher system codes in the form of radio waves to the vehicle. The first cipher system code contains a command for permitting engine start for the vehicle, and the second cipher system code is produced on the basis of a cryptographic code in the memory circuit and contains a command for closing or opening the door lock of the vehicle.
161 Citations
19 Claims
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1. A remote-control unit for vehicles, incorporated in a key to be fitted into a key cylinder for starting an engine of a vehicle, for communicating with said vehicle, comprising:
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a reception circuit for receiving a cryptographic code transmitted from said vehicle when said key is fitted into said key cylinder; a memory circuit for storing said cryptographic code; a manual switch to be handled by a user; a control circuit for producing a first cipher system code responsively to reception of said cryptographic code, and producing a second cipher system code responsively to handling of said manual switch, wherein said control circuit produces said second cipher system code, which is different for each communication, on the basis of said cryptographic code stored in said memory circuit; and a transmission circuit for transmitting said first and second cipher system codes in the form of radio waves to said vehicle, wherein said first cipher system code contains a command for permitting engine start for said vehicle; and said second cipher system code is produced on the basis of a cryptographic code existent in said memory circuit and contains a command for closing or opening the door lock of said vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification