基于混合信任模型的DPoS共识机制改进研究

Improved DPoS Consensus Mechanism Based on Hybrid Trust Model

针对“端—边—云”架构中“局部可信,全局不可信”的混合信任模型,提出基于混合信任的共识方案RT-DPoS。首先,设计声誉机制规范节点的行为并增强节点的投票积极性;然后,提出基于局部信任的投票策略指导节点的投票行为,并根据投票行为建立局部信任关系,在此基础上,综合考虑节点的信任关系和声誉值,设计了两阶段的策略选出代理节点集合,增强了代理节点的去中心化;再在共识过程中引入可验证随机函数优化代理节点出块顺序,增强对腐败攻击的抵抗力。实验表明,RT-DPoS可以避免节点盲目投票,保证代理节点的可靠性和去中心化,并增强共识过程中的安全性,相较于DPoS,RT-DPoS提升了23.38%的安全性能。

Considering the hybrid trust model of‘locally trusted,globally untrustworthy’in the end-edge-cloud architecture,this paper pro-poses an improved scheme of delegated proof of stake,named RT-DPoS(Reputation-Trust based DPoS).First of all,the reputation mecha-nism is designed to regulate nodes’behavior and augment nodes’voting motivation.Then,a voting strategy based on local trust is proposed to guide voting behavior and establish local trust relationships according to voting behavior.On this basis,considering the trust relationship and reputation value,a two-stage strategy is designed to select agent nodes so as to enhance the decentralization.Finally,a verifiable random func-tion is introduced to optimize the block order of the agent nodes to enhance the resistance to corruption attacks.The results of the experiment show that RT-DPoS can effectively mitigate blind voting,ensure the reliability and decentralization of agent nodes,and enhance the security of the consensus process.Compared with DPoS,RT-DPoS has improved security performance by 23.38%.