Design And Implementation Of Quantum Cryptography Protocols Based On Blockchain

With the rapid development of science and technology,the amount of information is increasing at an exponential rate,and the interaction of information is more frequent.It is particularly important to protect the security of information.Therefore,information security has attracted extensive attention and research from scholars.Due to the rise of quantum information technology,quantum cryptography came into being.Quantum cryptography has shown certain advantages in protecting information security.It has unconditional security in theory,which brings a new dawn to the field of information security.This thesis mainly studies two issues in the field of information security.The first question is about the quantum key distribution scheme.Aiming at the problem of applying keys for multiple pairs of users belonging to different regions,a blockchain-based quantum key distribution scheme is proposed.This solution is used to solve the problem of key distribution and achieve the purpose of improving the efficiency of key distribution and saving resources.The second question is for electronic payment protocols.After having studied the existing electronic payment protocols,we found that the existing electronic payment protocols still need to be improved.Therefore,a quantum electronic payment protocol based on blockchain is proposed to meet the needs of current payment environment and improve the practicability and security of the protocol.The main research contents of the thesis are as follows.1.A quantum key distribution scheme based on blockchain is proposed.We use the Quantum Key Distribution Protocol(QKD)to continuously generate keys and store the keys in the key pool.The key pool is only managed by the key pool manager,and the user applies for the key through the key pool manager.The pool manager distributes keys according to user needs,and the blockchain is used to record key distribution information.Finally,the scheme is analyzed,which can realize the efficient distribution of keys under the premise of ensuring the security requirements.2.A vulnerability analysis of "A Trusted Third-Party E-Payment Protocol Based on Quantum Blind Signature Without Entanglement" proposed by Guo et al.in 2018 is implemented by us.Then,we propose an improvement on it.Without changing the model,we change the encoding bases and encryption methods,increase identity verification,solve the security vulnerabilities of leaking keys,and improve the security of the protocol.After having analyzed the security of the protocol,we can conclude that the proposed protocol can meet the security requirements of electronic payment and ensure the security of the key.3.Combining the current electronic payment environment and actual market demand,a novel Quantum E-payment Protocol based on Blockchain is proposed.The protocol is based on the quantum blind signature technology of the three-particle entangled state,which realizes electronic payment through quantum teleportation.And the blockchain technology is used to help realize the electronic payment protocol.Finally,the security and correctness of the protocol are analyzed.Compared with the existing electronic payment protocols,the proposed electronic payment protocol adopts a three-particle entangled state and introduces blockchain technology,which has better feasibility and security.