Data processing apparatus

1. A data processing apparatus comprising:

a local source of data;

a first controller; and

a tamper-resistant second controller configured to communicate with the first controller and to verify integrity of a series of calculation operations performed by the first controller, the first controller being configured to control and receive data from the local source of data and from a sensing unit connected to the first controller via a communication interface and to perform the series of calculation operations on the data, wherein the first controller is configured to record history data derived from a start state and a finish state of the series of calculation operations and transmit the history data to the tamper-resistant second controller, the tamper-resistant second controller being configured to one of randomly and pseudo-randomly select and verify one of the calculation operations to verify integrity of the series of calculation operations using the history data.

2. A vehicle telematics system comprising the data processing apparatus of claim 1 , wherein the sensing unit is a location sensing unit and the local source of data comprises a source of map data, the first controller being configured to calculate a location of the vehicle based on data received from the location sensing unit.

3. The vehicle telematics system of claim 2 , wherein the local source of data comprises a source of fare data, the first controller is configured to calculate a fare based on the calculated location and data received from both the source of fare data and the source of map data.

4. The vehicle telematics system of claim 2 , wherein the tamper-resistant second controller is provided as a removable card comprising data for identifying a user of the vehicle telematics system.

5. The system of claim 2 , wherein the tamper-resistant second controller is configured to verify integrity of a selected subset of the calculation operations performed by the first controller during at least one of a location calculation operation and a fare calculation operation.

6. A metering system comprising the data processing apparatus of claim 1 , wherein the sensing unit is an energy meter and the first controller is configured to generate energy pricing based on data received from both the sensing unit and the local source of data.

7. The data processing apparatus of claim 1 , wherein the tamper-resistant second controller is configured to store the history data only for one selected operation to be verified.

8. The data processing apparatus of claim 1 , wherein the history data is derived from a hash of the start state and the finish state of the series of calculation operations.

9. The data processing apparatus of claim 8 , wherein the tamper-resistant second controller is configured to indicate to the first controller which of the history data are to be transmitted after the first controller has sent a hashed result of the calculation operations performed by the first controller.

10. A method of operating a data processing apparatus comprising a first controller and a tamper-resistant second controller, the method comprising:

receiving data at the first controller from a local source of data and from a sensing unit connected to the first controller via a communication interface;

performing at the first controller a series of calculation operations on the data;

recording at the first controller history data derived from a start state and a finish state of the series of calculation operations;

transmitting the history data from the first controller to the tamper-resistant second controller; and

one of randomly and pseudo-randomly selecting and verifying one of the calculation operations at the tamper-resistant second controller to verify integrity of the series of calculation operations by the first controller using the history data.

11. The method of claim 10 , wherein the sensing unit is a location sensing unit and the local source of data comprises a source of map data, the method comprising calculating at the first controller a location of a vehicle based on data received from the location sensing unit.

12. The method of claim 10 , wherein the sensing unit is an energy meter, the method comprising generating at the first controller energy pricing based on data received from both the sensing unit and the local source of data.

13. The method of claim 10 for operating the data processing apparatus in a vehicle telematics system, wherein the sensing unit is a location sensing unit and the local source of data comprises a source of map data, the method comprising:

calculating at the first controller a location of the vehicle based on data received from the location sensing unit;

calculating the series of calculation at the first controller including a fare based on the calculated location and the data received from both the source of fare data and the source of map data.

14. The method of claim 13 , wherein the local source of data comprises a source of fare data, the first controller calculates the fare based on the calculated location and data received from both the source of fare data and the source of map data.

15. The method of claim 13 , wherein the tamper-resistant second controller is provided as a removable card comprising data for identifying a user of the vehicle telematics system.

16. The method of claim 13 comprising verifying at the tamper-resistant second controller the integrity of a selected subset of the calculation operations performed by the first controller during at least one of a location calculation operation and a fare calculation operation.

17. The method of claim 10 for operating the data processing apparatus in a metering system, wherein the sensing unit is an energy meter, the method comprising generating at the first controller energy pricing based on data received from both the sensing unit and the local source of data.

18. The method of claim 10 comprising storing the history data only for one selected operation to be verified by the tamper-resistant second controller.

19. The method of claim 10 comprising deriving the history data from a hash of the start state and the finish state of the series of calculation operations.

20. The method of claim 10 comprising indicating, by the tamper-resistant second controller to the first controller, which of the history data are to be transmitted after the first controller has sent a hashed result of the calculation operations performed by the first controller.