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Article

Towards Quantum-Secured Permissioned Blockchain: Signature, Consensus, and Logic

1
Institute of Logic and Cognition, Sun Yat-sen University, Guangzhou 510275, China
2
MakoLab SA, 91062 Łódź, Poland
3
Department of Computer Science, University of Oxford, Oxford OX13QD, UK
4
Department of the Foundations of Computer Science, Catholic University of Lublin, 20950 Lublin, Poland
*
Author to whom correspondence should be addressed.
Entropy 2019, 21(9), 887; https://doi.org/10.3390/e21090887
Received: 7 July 2019 / Revised: 5 September 2019 / Accepted: 5 September 2019 / Published: 12 September 2019
(This article belongs to the Special Issue Blockchain: Security, Challenges, and Opportunities)
While Blockchain technology is universally considered as a significant technology for the near future, some of its pillars are under a threat of another thriving technology, Quantum Computing. In this paper, we propose important safeguard measures against this threat by developing a framework of a quantum-secured, permissioned blockchain called Logicontract (LC). LC adopts a digital signature scheme based on Quantum Key Distribution (QKD) mechanisms and a vote-based consensus algorithm to achieve consensus on the blockchain. The main contribution of this paper is in the development of: (1) unconditionally secure signature scheme for LC which makes it immune to the attack of quantum computers; (2) scalable consensus protocol used by LC; (3) logic-based scripting language for the creation of smart contracts on LC; (4) quantum-resistant lottery protocol which illustrates the power and usage of LC. View Full-Text
Keywords: blockchain; quantum computing; consensus; digital signature; lottery blockchain; quantum computing; consensus; digital signature; lottery
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MDPI and ACS Style

Sun, X.; Sopek, M.; Wang, Q.; Kulicki, P. Towards Quantum-Secured Permissioned Blockchain: Signature, Consensus, and Logic. Entropy 2019, 21, 887. https://doi.org/10.3390/e21090887

AMA Style

Sun X, Sopek M, Wang Q, Kulicki P. Towards Quantum-Secured Permissioned Blockchain: Signature, Consensus, and Logic. Entropy. 2019; 21(9):887. https://doi.org/10.3390/e21090887

Chicago/Turabian Style

Sun, Xin, Mirek Sopek, Quanlong Wang, and Piotr Kulicki. 2019. "Towards Quantum-Secured Permissioned Blockchain: Signature, Consensus, and Logic" Entropy 21, no. 9: 887. https://doi.org/10.3390/e21090887

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