Rolling-code based process and system

1. A rolling-code based process for the unambiguous identification of serial numbers in a data communication over a data communication system within a vehicle between at least first and second subscribers which have identical serial number sets stored in respective storage devices, said process comprising:

generating a first challenge relative to a serial number and transmitting, on at least one data line of a bus system within the vehicle, the first challenge from the first subscriber to the second subscriber;

analyzing the first challenge received from the first subscriber to determine whether the same serial number is stored at a corresponding position in the second subscriber;

generating a corresponding first response and transmitting, on the at least one data line, the first response as an output from the second subscriber to the first subscriber when the same serial number is stored at said corresponding position in the second subscriber;

generating a dummy response and transmitting, on the at least one data line, the dummy response as the output from the second subscriber to the first subscriber when the same serial number is not stored at said corresponding position in the second subscriber;

comparing the output from the second subscriber to determine if a serial number expected as a result of the first challenge and the output from the second subscriber are identical;

outputting an identification signal from the first subscriber when the expected serial number and the output are the same; and

outputting no identification signal otherwise.

2. The process according to claim 1 , wherein the first challenge is arbitrarily numbered in a storage device.

3. The process according to claim 2 , wherein the first challenge corresponds to a coded position number of a serial number of a serial number set.

4. The process according to claim 3 , wherein each serial number of the serial number sets is used only once.

5. The process according to claim 4 , wherein the first response is a serial number corresponding to the first challenge.

6. The process according to claim 5 , wherein a dummy challenge having at least one of a syntax and a value range that is identical to those of the first challenge is provided, and the dummy challenge forms a coded dummy position number of a dummy serial number which does not exist within the serial number sets.

7. The process according to claim 5 , wherein the dummy response has at least one of a syntax and a value range that is identical to those of the first response.

8. The process according to claim 6 , wherein each subscriber is capable of differentiating between the first challenge and the dummy challenge.

9. The process according to claim 6 , wherein, after the first subscriber transmits the first challenge, the second subscriber receives and analyzes the first challenge, and, after the second subscriber transmits the first response, the first subscriber receives and analyzes the first response.

10. The process according to claim 6 , wherein, after receiving the first challenge, the first response is transmitted from the second subscriber to the first subscriber, and, after receiving the dummy challenge, the dummy response is transmitted from the second subscriber to the first subscriber.

11. The process according to claim 6 , wherein each subscriber has a defined position in a motor vehicle, and a subscriber is rendered inoperable if said subscriber is removed from its defined position.

12. A rolling-code based system for the unambiguous identification of serial numbers in a data communication over a data communication system within a vehicle between at least two subscribers which have identical serial number sets stored in respective storage devices that performs the rolling-code based process of claim 1 .

13. The system according to claim 12 , wherein the second subscriber is a coated radiator for a motor vehicle.