• Title/Summary/Keyword: Concensus algorithm

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A Study on Scalable PBFT Consensus Algorithm based on Blockchain Cluster (블록체인을 위한 클러스터 기반의 확장 가능한 PBFT 합의 알고리즘에 관한 연구)

  • Heo, Hoon-Sik;Seo, Dae-Young
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.20 no.2
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    • pp.45-53
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    • 2020
  • Blockchain can control transactions in a decentralized way and is already being considered for manufacturing, finance, banking, logistics, and medical industries due to its advantages such as transparency, security, and flexibility. And it is predicted to have a great economic effect. However, Blockchain has a Trilemma that is difficult to simultaneously improve scalability, decentralization and security characteristics. Among them, the biggest limitation of blockchain is scalability, which is very difficult to cope with the constantly increasing number of transactions and nodes. To make the blockchain scalable, higher performance should be achieved by modifying existing consensus methods or by improving the characteristics and network efficiency that affect many ways of scaling. Therefore, in this paper, we propose a cluster-based scalable PBFT consensus algorithm called CBS-PBFT which reduces the message complexity O(n2) of PBFT to O(n), which is a representative consensus algorithm of blockchain, and the validity is verified through simulation experiments.