CAN bus safety identification method based on transient state

Abstract

The invention discloses a CAN bus safety identification method based on a transient state. The method comprises the following steps that 1, when an automobile leaves a factory, factory setting is conducted by a manufacturer, power-on starting is conducted on all ECUs, the ECUs obtain transient values Vts of the ECUs and send the transient values Vts to other ECUs, and after factory setting is finished, the transient values Vts of the other ECUs are stored in all the ECUs; 2, when the automobile is started each time, the ECU obtains a starting time stamp Ti; 3, each ECU generates a dynamic keyK, the key K is only effective in the driving period of the automobile, and when the automobile is stalled and K is invalid, a new key K can be generated again when the automobile is started next time; 4, the message data is encrypted by using the dynamic key K of the ECU when the ECU sends the message to obtain DATA; and the receiver ECUi finds out the transient value of the sender from the transient values stored in the receiver ECUi after receiving the message, calculates a decryption secret key K' according to Ti, and decrypts the encrypted message DATA to obtain the message data if K'=K.

Description

technical field [0001] The invention relates to a transmission authentication method combined with a transient state and a time stamp to identify a CAN (Controller Area Network) automobile bus transmission abnormality, in particular to a transient state-based CAN bus security authentication method. Background technique [0002] The CAN protocol is a serial communication bus protocol developed by the German BOSCH company. It uses a bus-type connection to connect multiple electronic control units in the car. Compared with traditional protocols, the communication required by the car is greatly reduced. lines, and provides higher reliability of data transmission. However, this bus protocol does not consider much in terms of security. Since the vehicle is in a continuous high-speed state during driving, the communication of the electronic control unit in the vehicle controls the driving state of the vehicle. If a hacker attacks the vehicle while the vehicle is running , may caus...

AI Technical Summary

Problems solved by technology

Since the private key is held independently, this method is more secure than the symmetric encryption algorithm, but unfortunately, the complexity of this method is also higher. In order to ensure the authenticity and validity of the public key, this method needs to have A third-party organization conducts certificate authentication, and the encryption and decryption of this method are more complicated, so this method is not actually suitable for CAN communication encryption

Images