Towards Quantum-Secured Permissioned Blockchain: Signature, Consensus, and Logic
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Date
2019-09-12
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
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.
Description
Keywords
blockchain, quantum computing, consensus, digital signature, lottery
Citation
"Entropy" 2019, 21(9), 887