A two-dimensional coupling chaos-based lightweight security communication method for vehicle CAN bus

Abstract

The application discloses a kind of based on two-dimensional coupling chaos vehicle CAN bus lightweight security communication method, belong to vehicle network security communication technical field.This method is applied to the layered vehicle network including gateway electronic control unit GECU, domain control unit DCU and electronic control unit ECU, including four stages of system initialization, identity authentication, key distribution and secure communication.Through two-dimensional coupling chaotic mapping, random challenge value, authentication random quantity and chaotic seed are generated, and combined with global round parameter epoch and domain key evolution parameter rand, a layered key management mechanism is constructed to realize the local derivation of inter-domain and intra-domain shared session keys.The sending node uses the shared session key to perform lightweight encryption and authentication on the service data, and encapsulates the ciphertext and authentication tag in the same CAN message for transmission.This method improves the communication performance of vehicle CAN bus without significantly increasing communication overhead and computational overhead.

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