基于权力指数的DPoS共谋攻击检测与预防  

Detecting and preventing collusion attack in DPoS based on power index

作　　者：付晓东[1,2] 漆鑫鑫 刘骊[1] 彭玮[1] 丁家满[1] 代飞 FU Xiaodong;QI Xinxin;LIU Li;PENG Wei;DING Jiaman;DAI Fei(Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Provincial Key Laboratory of Computer Technology Application,Kunming University of Science and Technology,Kunming 650500,China;College of Big Data and Intelligent Engineering,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]昆明理工大学信息工程与自动化学院,云南昆明650500 [2]昆明理工大学云南省计算机应用技术重点实验室,云南昆明650500 [3]西南林业大学大数据与智能工程学院,云南昆明650224

出　　处：《通信学报》2022年第12期123-133,共11页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61962030,No.62262036);云南省中青年学术和技术带头人后备人才培养计划基金资助项目(No.202005AC160036);云南省窦万春专家工作站基金资助项目(No.202105AF150013);云南省重大科技专项计划基金资助项目(No.202102AD080002)。

摘　　要：针对DPoS共识机制存在恶意节点通过共谋操纵选举,导致DPoS共识过程中区块链安全性无法保证的问题,提出基于权力指数的DPoS共谋攻击检测与预防方法。首先,借鉴博弈理论中权力指数的思想,构建DPoS的加权投票博弈模型,以分析恶意节点的行为动机。然后,通过异常的权力指数变化幅度进行攻击检测,在预防DPoS共谋攻击的过程中,加入Softsign激活函数抑制恶意节点的权力指数。最后,理论分析与实验验证了所提方法检测和预防DPoS共谋攻击的有效性。Since malicious nodes may manipulate voting elections through collusion attacks in consensus mechanism of DPoS, the security of block chain can not be guaranteed in the consensus process of DPoS. To deal with the problem, a method for detecting and preventing collusion attack in DPoS based on power index was proposed. Firstly, a weighted voting game model of DPoS was constructed based on the idea of power index in game theory, and the behavioral motivation of the malicious node could be analyzed. Then, the attacks were detected based on changing range of abnormal power index. During the process of preventing collusion attacks in DPoS, the Softsign activation function was adapted to suppress the power index of malicious nodes. Lastly, the effectiveness of the proposed method to detect and prevent collusion attacks in DPoS was verified through theoretical analysis and experiments.

关 键 词：区块链 DPoS共识机制 共谋攻击 权力指数 加权投票博弈 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]