Netinfo Security ›› 2023, Vol. 23 ›› Issue (8): 41-51.doi: 10.3969/j.issn.1671-1122.2023.08.004

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A QKD-Based Multiparty Byzantine Consensus Agreement

XIE Sijiang1,2,3, CHENG Andong1(), GONG Pengfei2   

  1. 1. Beijing Electronic Science and Technology Institute, Beijing 100070, China
    2. School of Computer Science and Technology, Xidian University, Xi’an 710071, China
    3. University of Science and Technology of China, Hefei 230026, China
  • Received:2023-04-24 Online:2023-08-10 Published:2023-08-08
  • Contact: CHENG Andong E-mail:caddxy@foxmail.com

Abstract:

The digital signature used in the classic Byzantine consensus protocol exposes its vulnerability under quantum computing attacks. Many existing quantum secure Byzantine consensus protocols use technologies such as quantum entanglement, which is costly to construct and difficult to popularize. The protocol using more mature entanglement-free quantum technology, such as quantum key distribution(QKD), ensures better practicability while resisting quantum attacks. Based on the nonentangled multiparty quantum Byzantine protocol, a multiparty Byzantine consensus protocol based on QKD was proposed by adding bulletin boards, changing the consensus process, and using unconditionally secure MAC. Compared to the nonentangled multiparty quantum Byzantine protocol, it fixes three security risks, reduces the use of QKD-generated keys, increases the consensus target from detectable Byzantine agreement(DBA) to Byzantine agreement(BA), and maintains the tolerance for any number of Byzantine nodes, which improves security, scalability, and operational efficiency.

Key words: Byzantine consensus agreement, bulletin board, QKD

CLC Number: