基于区块链的车联网信任机制

车联网（VANETs）中虚假的共享信息会导致负面影响。针对车辆间的信任缺失现象,提出了一种基于区块链的信任解决方案。通过引入贝叶斯推理,基于先验概率进行信任评估,综合考虑了消息可信度和源节点自身可信度。通过超级账本实现信任管理,路侧单元（RSU）将汇聚车辆提交的评价形成信任值并创建区块,利用智能合约进行信任值初始化、查询和更新操作。仿真结果显示,提出方案能有效进行信任评估,准确识别虚假消息。同时与现有方案对比表明,该方案具有更高吞吐量和更低时延,适用于车联网的轻量级资源消耗环境。

Blockchain-based trust mechanism in VANETs

False shared information in VANETs can lead to negative effects. Aiming at the lack of trust between vehicles, this paper proposed a trust solution based on blockchain. By introducing Bayesian inference, it evaluated the trust level based on prior probability, and considered the message credibility and the source node''s own credibility. The Hyperledger was responsible for managing trust values. RSU formed a trust value and created a block by aggregating the evaluation submitted by the vehicle, the smart contract performed trust value initialization, query and update operations. Simulation results show that the proposed scheme can effectively evaluate trust and accurately identify false messages. At the same time, compared with the existing schemes, the proposed scheme has higher throughput and lower delay, which is suitable for the lightweight resource consumption environment of VANETs.