In-vehicle data secure monitoring method

Abstract

The invention relates to the technical field of computer data security, in particular to an in-vehicle data secure monitoring method. The method comprises: S1: acquiring n wheel speed data v at a time interval T, marking the n wheel speed data as {v1, v2, and the like, vn} (n is an element of a set [20, 100]), and storing the wheel speed data v in a to-be-detected data cache; S2: performing related sequence transformation on the wheel speed data v; and S3: abnormal detection: according to the step of related sequence transformation, determining that a first-order related sequence M1 and a second-order related sequence M2 during uniform-speed driving of a vehicle are same. The invention provides the in-vehicle data secure monitoring method; and by effectively monitoring the security of the wheel speed data in an in-vehicle network, whether abnormal falsified wheel speed data is mixed in normal data is effectively detected, so that the security of information in the in-vehicle network is ensured.

Description

technical field [0001] The invention relates to the technical field of computer data security, in particular to an in-vehicle data security monitoring method. Background technique [0002] At present, the internal controllers of automobiles communicate with each other through a broadcast fieldbus (such as CAN bus). For the ABS (anti-lock braking system) controller, it is necessary to According to the wheel speed signal sent by each wheel speed sensor, ABS can quickly determine whether the wheel is locked, so as to start the brake control to ensure the safety of the vehicle. Since the modern in-vehicle bus is in the form of broadcasting, and lacks the identification of the source of the message and the encryption of the message content, it is relatively easy for hackers to inject forged data into the in-vehicle bus through other devices mounted on the in-vehicle bus. For example, wrong wheel speed data can be broadcast to the bus in the car through the OBD port, which will c...

AI Technical Summary

Problems solved by technology

Since the modern in-vehicle bus is in the form of broadcasting, and lacks the identification of the source of the message and the encryption of the message content, it is relatively easy for hackers to inject forged data into the in-vehicle bus through other devices mounted on the in-vehicle bus. For example, wrong wheel speed data can be broadcast to the bus in the car through the OBD port, which will cause ABS to misjudge and misstart the locked state, thereby causing vehicle safety problems and even dangerous accidents.

[0003] Since the traditional ABS self-diagnosis system can only judge whether it is faulty, but cannot deal with such attacks that inject forged data into the in-vehicle network, the present invention proposes a safety monitoring device and method for vehicle wheel speed data. The device on the car's internal bus monitors the safety of the car's internal network data and monitors the car's wheel speed data on the bus in real time. Due to the strong time correlation of the data before and after the normal wheel speed (speed increase and decrease have a linear gradual change process) , there will be no irregular jumping phenomenon, and the inserted forged data will obviously disrupt the time correlation of normal data. Therefore, according to the characteristics of strong correlation between normal vehicle speed and wheel speed data, a wheel speed is designed and invented. The data correlation detection method converts the wheel speed data sequence into a relevant data sequence, extracts the difference between the relevant data sequence and the reference data sequence, and detects whether the vehicle speed and wheel speed data on the bus contain forged inserted data according to the difference , and give an alarm prompt according to the detection result

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