CRBFT:A Byzantine Fault-Tolerant Consensus Protocol Based on Collaborative Filtering Recommendation for Blockchains  

作　　者：Xiangyu Wu Xuehui Du Qiantao Yang Aodi Liu Na Wang Wenjuan Wang 

机构地区：[1]He’nan Province Key Laboratory of Information Security,Information Engineering University,Zhengzhou,450000,China [2]School of Cyber Science Engineering,Zhengzhou University,Zhengzhou,450000,China

出　　处：《Computers, Materials & Continua》2024年第7期1491-1519,共29页计算机、材料和连续体（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.62102449)awarded to W.J.Wang.

摘　　要：Blockchain has been widely used in finance,the Internet of Things(IoT),supply chains,and other scenarios as a revolutionary technology.Consensus protocol plays a vital role in blockchain,which helps all participants to maintain the storage state consistently.However,with the improvement of network environment complexity and system scale,blockchain development is limited by the performance,security,and scalability of the consensus protocol.To address this problem,this paper introduces the collaborative filtering mechanism commonly used in the recommendation system into the Practical Byzantine Fault Tolerance(PBFT)and proposes a Byzantine fault-tolerant(BFT)consensus protocol based on collaborative filtering recommendation(CRBFT).Specifically,an improved collaborative filtering recommendation method is designed to use the similarity between a node’s recommendation opinions and those of the recommender as a basis for determining whether to adopt the recommendation opinions.This can amplify the recommendation voice of good nodes,weaken the impact of cunningmalicious nodes on the trust value calculation,andmake the calculated resultsmore accurate.In addition,the nodes are given voting power according to their trust value,and a weight randomelection algorithm is designed and implemented to reduce the risk of attack.The experimental results show that CRBFT can effectively eliminate various malicious nodes and improve the performance of blockchain systems in complex network environments,and the feasibility of CRBFT is also proven by theoretical analysis.

关 键 词：Blockchain CONSENSUS byzantine fault-tolerant collaborative filtering TRUST 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]