Internet of vehicles combination weighting trust evaluation method and system based on block chain

The invention discloses an Internet of Vehicles combination weighting trust evaluation method and system based on a block chain, and relates to the field of Internet of Vehicles security, and the method comprises the steps: building a mutual reference relation between a vehicle and a roadside unit through building a double-layer trust evaluation mechanism of the vehicle and the roadside unit; a subjective analytic hierarchy process and an objective entropy weight method are adopted to dynamically adjust the weight in real time, the reliability of the model is ensured, a comprehensive trust value is taken as a trust basis, and a message trust value obtained by instant messaging is taken as a subsequent influence of the comprehensive trust value; the trust value information is uploaded to a block chain network for maintenance, dynamic trust evaluation is efficiently realized, and malicious vehicles are accurately and efficiently identified; in addition, trust data consistency of different areas is ensured by us