SECURE SERIAL DATA COMMUNICATION DUAL PATH METHOD

• US 20070024910A1
• Filed: 07/27/2006
• Published: 02/01/2007
• Est. Priority Date: 07/29/2005
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Thomas, James, Forest, Thomas, Katrak, Kerfegar
• Granted Patent: US 7,464,203 B2
• Time in Patent Office: Days
• US Class Current: 358/1.180
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0061 Error detection codes

Abstract

A method and apparatus is provided for validating a plurality of variable data transmitted in an automobile, comprising generating a control copy and a redundant copy of the variable data, calculating a pre-transmittal cross-check measure using the redundant copy of the variable data, and generating a transmittal message using the control copy of the data and the pre-transmittal cross-check measure.

Claims

1. A method of validating a plurality of variable data transmitted in an automobile, the method comprising the steps of:

generating a control copy and a redundant copy of the variable data;

calculating a pre-transmittal cross-check measure using the redundant copy of the variable data; and

generating a transmittal message using the control copy of the data and the pre-transmittal cross-check measure.

2. The method of claim 1, further comprising the steps of:

transmitting the transmittal message; and

receiving a received message based at least in part on the transmitted transmittal message, the received message comprising a received data component and a received pre-transmittal cross-check measure.

3. The method of claim 2, further comprising the steps of:

calculating a post-transmittal cross-check measure using the received data component; and

comparing the calculated post-transmittal cross-check measure with the received pre-transmittal cross-check measure.

4. The method of claim 1, further comprising the steps of:

calculating a control copy cross-check measure from the control copy of the variable data; and

comparing the calculated control copy cross-check measure with the pre-transmittal cross-check measure.

5. The method of claim 1, wherein the pre-transmittal cross-check measure comprises a checksum.

6. The method of claim 1, further comprising the step of:

formatting at least the control copy of the variable data, thereby generating formatted control data.

7. The method of claim 1, further comprising the step of:

formatting at least the redundant copy of the variable data, thereby generating formatted redundant data.

8. The method of claim 6, further comprising the step of:

concatenating the pre-transmittal cross-check measure and the formatted control data.

9. A method of validating a plurality of variable data transmitted in an automobile, the method comprising the steps of:

generating a control copy and a redundant copy of the variable data;

calculating a pre-transmittal checksum using the redundant copy of the variable data;

generating a transmittal message using the control copy of the data and the pre-transmittal checksum;

transmitting the transmittal message; and

receiving a received message based at least in part on the transmitted transmittal message, the received message comprising a received data component and a received pre-transmittal checksum.

10. The method of claim 9, further comprising the steps of:

calculating a post-transmittal checksum using the received data component; and

comparing the calculated post-transmittal checksum with the received pre-transmittal checksum.

11. The method of claim 9, further comprising the steps of:

calculating a control copy checksum from the control copy of the variable data; and

comparing the calculated control copy checksum with the pre-transmittal checksum.

12. The method of claim 9, further comprising the steps of:

formatting at least the control copy of the variable data, thereby generating formatted control data; and

concatenating the pre-transmittal checksum and the formatted control data.

13. An apparatus for validating a plurality of variable data transmitted in an automobile, the apparatus comprising:

means for generating a control copy and a redundant copy of the variable data;

means for calculating a pre-transmittal cross-check measure using the redundant copy of the variable data; and

means for generating a transmittal message using the control copy of the data and the pre-transmittal cross-check measure.

14. The apparatus of claim 13, further comprising:

means for transmitting the transmittal message; and

means for receiving a received message based at least in part on the transmitted transmittal message, the received message comprising a received data component and a received pre-transmittal cross-check measure.

15. The apparatus of claim 14, further comprising:

means for calculating a post-transmittal cross-check measure using the received data component; and

means for comparing the post-transmittal cross-check measure with the received pre-transmittal cross-check measure.

16. The apparatus of claim 13, further comprising:

means for calculating a control copy cross-check measure from the control copy of the variable data; and

means for comparing the control copy cross-check measure with the pre-transmittal cross-check measure.

17. The apparatus of claim 13, wherein the pre-transmittal cross-check measure comprises a checksum.

18. The apparatus of claim 13, further comprising:

means for formatting at least the control copy of the variable data, thereby generating formatted control data.

19. The apparatus of claim 13, further comprising:

means for formatting at least the redundant copy of the variable data, thereby generating formatted redundant data.

20. The apparatus of claim 18, further comprising:

means for concatenating the pre-transmittal cross-check measure and the formatted control data.