Key exchange method for communication of automobile electronic control unit

Abstract

The invention relates to a key exchange method for automobile electronic control unit communication, which comprises the following steps that 1, an encryption object is selected, and a plurality of electronic control units are classified into a Master and a Slave; 2, a system is initialized, the Slave is accessed to the Master, and the Master checks whether a key parameter needs to be generated ornot; if so, a key parameter is generated, and simultaneously the key parameter is stored into safe storage areas of the Master and the Slave; if not, the originally generated key parameters are used;3, a secret key is generated in real time, after the vehicle is ignited each time, the Master and the Slave respectively generate a random number, and the secret key is generated according to secretkey parameters and the random numbers; and step 4, data encryption: the Master encrypts the communication data needing to be sent to the Slave through the secret key, and the Slave encrypts the communication data needing to be sent to the Master through the secret key. The secret key exchange method for automobile electronic control unit communication is low in encryption cost, does not need to establish a special server to store the secret key, is low in secret key leakage risk, and has very high safety.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a key exchange method for communication of electronic control units of automobiles. Background technique [0002] With the rapid development of intelligent networked vehicles, automobile information security incidents emerge in an endless stream, and the information security of intelligent networked vehicles has attracted more and more attention. [0003] The communication between the electronic control units inside the car is restricted by traditional communication methods, usually in plain text transmission, and the data is easily cracked, replayed, etc., which has become a weakness of the car being attacked. [0004] In order to improve the communication security, the common method at present is to encrypt the communication data, and use the message authentication code to ensure the integrity and authenticity of the data. Generally, a symmetric encryption algorithm is used. [000...

AI Technical Summary

Problems solved by technology

At present, the common method is to inject the key into the electronic control unit through diagnostic methods before the vehicle goes off-line. At the same time, the key needs to be stored in the server database, which requires complex key management.

Images