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consortium chain Consensus Vulnerability and chain Generation Mechanism

Computers, Materials & Continua 2023年第11期77卷 2505-2527页

作者： Rui Qiao hi Dong School of Computer Science and Technology Zhoukou Normal UniversityZhoukou466001China

Effectively identifying and preventing the threat of Byzantine nodes to the security of distributed systems is a challenge in applying consortium chains.Therefore,this paper proposes a new consortium chain generation model,deeply analyzes the vulnerability of the consortium chain consensus based on the behavior of the nodes,and points out the effects of Byzantine node proportion and node state verification on the consensus process and system security.Furthermore,the normalized verification node aggregation index that represents the consensus ability of the consortium organization and the trust evaluation function of the verification node set is derived.When either of the two is lower than the threshold,the consortium institution or the verification node set members are dynamically adjusted.On this basis,an innovative consortium chain generation mechanism based on the Asynchronous Binary Byzantine Consensus Mechanism(ABBCM)is proposed.Based on the extended consortium chain consensus mechanism,a certain consensus value set can be combined into multiple proposals,which can realize crossdomain asynchronous message passing between multi-consortium chains without reducing the system’s security.In addition,experiments are carried out under four classical Byzantine Attack(BA)behaviors,BA1 to BA4.The results show that the proposed method can obtain better delay than the classical random Byzantine consensus algorithm Coin,effectively improving the consensus efficiency based on asynchronous message passing in the consortium chain and thus meeting the throughput of most Internet of Things(IoT)applications.

关键词： consortium chain Byzantine consensus generation mechanism Internet of Things consensus vulnerability

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Self-Renewal consortium Blockchain Based on Proof of Rest and Strong Smart Contracts

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Tsinghua Science and Technology 2022年第6期27卷 964-972页

作者： Wenyu Shen Xuebing Huang Yunshan Fu Yongwei Hou Li Ling School of Information Science and Technology Fudan UniversityShanghai 200433China

Focusing on the business alliance scenario in blockchains,this paper proposes a new consensus mechanism named proof of rest(PoR)and strong smart contracts.The block structure and logic of PoR consensus are described.And a consortium blockchain system supporting strong smart contracts is designed.We modify the difficulty value algorithm based on proof of work(PoW)and add adjustable parameters.The longer a node rests after creating a block,the less difficult it is to create another new block,hence the term PoR.The penalty for slack nodes,the joining and quitting of nodes,and the adjustment of the expected block creation time can all be accomplished using the strong smart contracts,so the consortium blockchain can realize self-renewal.

关键词： blockchain consortium chain proof of rest(PoR) smart contract self-renewal

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