US 2020/0394341 A1 · MESSAGE SOURCE DETECTION IN A VEHICLE BUS SYSTEM

Abstract

Systems and methods for identifying the source of a message transmitted on the CAN bus of a vehicle, by creating a unique signature for each ECU. The system is further configured to detest malicious activities on a CAN bus system having a given physical configuration. The signature of an ECU is created based on the non-linearity of the CAN bus, by determining from at least one pulse of a read message a training-signature that includes a pair of sub-signatures: a rising-sub-signature of the rising response, and a falling-sub-signature of the falling response, as viewed by said message generating ECU. By reading a plurality of messages from the ECUs operationally integrated on the CAN bus system, a classification & prediction methodology is used to create, for each message generating ECU, from the respective training-signatures, a unique ECU-signature.

Claims30

Dependent claims

A method for creating an ECU-signature for an Electronic Control Unit (ECU), the ECU being integrally operating within a CAN-bus sub-system of a vehicle, the CAN-bus sub-system having at least two ECUs, the method comprising the steps of:

a) reading and storing into a memory storage a plurality of CAN-bus messages, wherein each of said CAN-bus message is generated by an ECU of said at least two ECUs;
b) based on the non-linearity of the CAN bus, determining from at least one pulse of each of said read message a training-signature, wherein each of said training-signatures comprises a pair of sub-signatures:
i) a rising-sub-signature of the rising response, being the impulse response of the rising section of said at least one pulse of the CAN bus system, as viewed by said message generating ECU;
and
ii) a falling-sub-signature of the falling response, being the impulse response of the falling section of said at least one pulse of the CAN bus system, as viewed by said message generating ECU;
and
c) for each of said message generating ECUs, determine a unique ECU-signature from said respective training-signatures.

4 more elements

A system for creating a unique ECU-signature for an ECU, the ECU being integrally operating within a CAN-bus sub-system of a vehicle, the CAN-bus sub-system having at least two ECUs, the system comprises a classifier comprising:

a) a controller;
b) a listening-sensor;
and
c) a temporary memory storage,
wherein, during a training stage, said classifier is configured to:
a) by said listening-sensor, read from the CAN-bus a plurality of CAN-bus messages, wherein each of said CAN-bus message is generated by an ECU of said at least two ECUs, and store said read CAN-bus messages in said temporary memory storage;
b) based on the non-linearity of the CAN bus, determining from at least one pulse of each of said read message a training-signature, wherein each of said training-signatures comprises a pair of sub-signatures:
i) a rising-sub-signature of the rising response, being the impulse response of the rising section of said at least one pulse of the CAN bus system, as viewed by said message generating ECU;
and
ii) a falling-sub-signature of the falling response, being the impulse response of the falling section of said at least one pulse of the CAN bus system, as viewed by said message generating ECU;
and
c) for each of said message generating ECUs, determine by said controller a unique ECU-signature from said respective training-signatures.

9 more elements

Dependencies are inferred from the claim text.

Message source detection in a vehicle bus system

Life of this patent

Message source detection in a vehicle bus system

Life of this patent

Abstract

Claims30