Scrambling data for use with vehicle communication protocol
A scrambling method of data on a J1939 communication system of a vehicle involves at least moving data from one of a PGN and a PGN/SPN location to another PGN or PGN/SPN location at a first controller on the vehicle before transmitting data and then re-ordering the data at a second controller. Some embodiments further comprise encrypting data either before or after shifting, but before transmitting so as to further complicate efforts to interpret meaningful data from the transmission. The second controller may be on the vehicle or may be remotely located.
1. A method of scrambling data on a vehicle communications portal, the method comprising:
a) providing a vehicle with a J1939 protocol communication system having a plurality of PGNs and SPNs associated with respective PGNs;
b) shifting data from a first PGN/SPN assignment in accordance with a first algorithm to a second PGN/SPN assignment to provide shifted data with a first controller on the vehicle; and then
c) transmitting the data after the shifting step from a first location to a second location; and then
d) restoring the data to a pre-shifted condition with a second controller.
2. The method of claim 1 further comprising the steps of (e) encrypting the shifted data prior to the transmitting step, and (f) decoding the encrypted data after the transmitting step.
3. The method of claim 2 further comprising the steps of repeating steps (b)-(d), and wherein the encrypting step further comprises the step of changing the encryption key at an interval.
4. The method of claim 3 wherein the encrypting step further comprises changing the encryption key with each transmitting step.
5. The method of claim 1 further comprising the steps of repeating steps (b)-(d) and changing the shifting algorithm from the first algorithm to a second algorithm at a preselected interval.
6. The method of claim 5 wherein the shifting step further comprises changing the shifting algorithm prior to each transmitting step.
7. The method of claim 1 further comprising the step of inserting phantom data into at least some PGN/SPN locations prior to the shifting step, and at least one of the first and second PGN/SPN assignments have phantom data which is shifted during the shifting step.
8. The method of claim 7 further comprising the steps of (e) encrypting the shifted data prior to the transmitting step, and (f) decoding the encrypted data after the transmitting step.
9. The method of claim 1 further comprising the step of communicating an event with a plurality of PGN/SPN locations, at least one of which is in the first PGN/SPN assignment.
10. The method of claim of 9 further comprising the step of communicating a time stamp with a plurality of PGN/SPN locations, at least one of which is in the first PGN/SPN assignment.
11. The method of claim of 9 further comprising the step of communicating a GPS location with a plurality of PGN/SPN locations, at least one of which is in the first PGN/SPN assignment.
12. The method of claim of 9 further comprising the step of communicating an event related to a stimulus external to the vehicle with a plurality of PGN/SPN locations, at least one of which is in the first PGN/SPN assignment.
13. The method of claim 12 wherein the event relates to a refuse container.
14. The method of claim 1 wherein the second controller is located on the vehicle.
15. The method of 1 wherein the first controller is a controller which coordinates the dumping of a refuse container into the vehicle.
16. The method of 1 wherein the first controller further comprises a grabber arm position sensor.
17. The method of claim 1 wherein the transmitting step occurs through an OBD 2 port.
18. The method of claim 1 wherein the second controller is remote from the vehicle.
19. A method of scrambling data on a vehicle communications portal, the method comprising:
a) providing a vehicle with a J1939 protocol communication system having a plurality of PGNs with associated SPNs;
b) shifting data from a first assignment in accordance with a first algorithm to a second assignment to provide shifted data wherein the first and second assignments are one of PGNs and PGN/SPN locations with a first controller on the vehicle; and then
c) transmitting the data after the shifting step from a first location to a second location; and then
d) restoring the data to a pre-shifted condition with a second controller.
20. The method of claim 19 wherein the second controller is remote from the vehicle.