Method for safety communication of ECUs (Electronic Control Unit) in CAN (controller area network) bus

Abstract

The invention discloses a method for safety communication of ECUs (Electronic Control Unit) in a CAN (controller area network) bus, which comprises the steps that: 1, a system model is established; 2, an GECU (Gateway Electronic Control Unit) loads a session key into a safety storage of the GECU; 3, the GECU carries out session key distribution on each ECU in the CAN bus; 4, a receiver ECUr carries out authentication on an encrypted data frame sent by a sender ECUs; 5, the GECU updates an encryption key and an authentication key which are used for communication, wherein update is mainly divided into two stages of in-vehicle ECU key update and key update when a connection of external equipment is released; and 6, when a vehicle is connected with the external equipment, designing an additional authentication and key distribution method so as to ensure legality of the accessed external equipment. According to the method disclosed by the invention, calculation cost can be obviously reduced, and a load of the CAN bus is reduced; and optimization is carried out for a key distribution protocol in the in-vehicle CAN bus, a key update problem generated when the external equipment is connected and released is considered, a counter is used for generating a random number to change a parameter for key generation, and a relay attack is effectively prevented.

Description

technical field [0001] The invention relates to the fields of in-vehicle network, communication protocol design, key distribution, safety authentication and encryption, and in particular relates to the field of safe communication of electronic control units in the CAN bus in the car. Background technique [0002] The existing car model is integrated with various information technologies to provide users with a comfortable driving environment. In order to apply information technology to vehicles, various intelligent application components are installed. Among these components, an electronic control unit (ECU) is the most important component that controls vehicle electronic systems. The vehicle electronic system is composed of more than 70 ECUs. These ECUs are interconnected through different communication networks such as the Controller Area Network (CAN). If an attacker injects illegal control information into the ECU, it will directly threaten the lives of passengers. Ther...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to propose a method for safe communication of ECU in the CAN bus to solve security problems such as injecting illegal information into the ECU in the CAN bus in the car, stealing data from the car network, and accessing and releasing external devices.

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