CAN (controller area network)-bus automobile-engine IMMO (immobilizer) system and authentication method thereof

Abstract

The invention relates to a CAN (controller area network)-bus automobile-engine IMMO (immobilizer) system and an authentication method thereof. The CAN-bus automobile-engine IMMO system comprises an engine control unit, an IMMO controller unit and a key assembly, the engine control unit is in communication connection with the IMMO controller unit and is used for verifying authentication algorithm with the IMMO controller unit and controlling whether to start the engine or not, the IMMO control unit in communication connection with the engine control unit stores the authentication algorithm between the key assembly and the engine controller, and is used for transmitting commands and encrypted data in the IMMO system. The key assembly comprises a transponder and an IMMO coil. Transmitting of the IMMO system is realized through a CAN bus, AES128 algorithm is added into the authentication process of the IMMO system, 128-bit encrypted data are used as operators, and cracking difficulty of the IMMO system is increased. By the aid of two IMMO authentication algorithms, the cracking difficulty of the CAN-bus automobile-engine IMMO system is increased as compared with that of the IMMO system with only one authentication algorithm.

Description

technical field [0001] The invention belongs to the field of electronic control of automobile engines, and in particular relates to a CAN bus automobile engine anti-theft system and an authentication method thereof. Background technique [0002] The use of current automobiles has become more and more common, and the anti-theft of vehicles has also become an increasingly important device. Many countries have mandated that vehicles must be equipped with an engine anti-theft function, so it is necessary for vehicle manufacturers to develop an engine anti-theft system device. Due to the low transmission rate of the anti-theft information of the traditional K-line engine and the long time for anti-theft authentication, it has been gradually eliminated by the market. Compared with the traditional K line, the CAN bus improves the transmission rate and reduces the error rate of information. There are the following technical problems in the prior art: the traditional anti-theft sys...

AI Technical Summary

Problems solved by technology

There are the following technical problems in the prior art: the traditional anti-theft system uses K line, and is a single anti-theft authentication algorithm, and its algorithm is mainly determined by the key chip. long, and an algorithm that makes cracking relatively easy

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