Research On Quantum Proxy Blind Signature And Electronic Payment Scheme

Digital signature is an important research content in cryptography.It plays an extremely important role.in message authentication,identity authentication,and is also an important tool to realize electronic payment,electronic voting,electronic auction and so on.Because the quantum mechanics has powerful computing ability,the security of classical digital signature which used computational complexity is seriously threatened in the quantum compuing environment.In order to solve this problem,we use the basic principles of quantum mechanics in the signature scheme to obtain a more secure signature scheme.Theoretically,quantum signatures can achieve unconditional security.Therefore,studying quantum signatures is of important significance.At present,the development of quantum signature is still not mature in cryptography,and it is still a hot topic of scholars.In t his thesis,we focus on quantum signature and electronic payment,so we propose unconditionally secure quant um multi-proxy blind signat ure scheme,mobile olect ronic payment and third-party electronic payment protocols.The main results of this thesis are as follows:1.Based on the controlled quantum teleportation,we propose a quantum multi-proxy blind signature scheme.We just use the four-particle Cluster state in our scheme,which need less resources.Besides,it is only necessary to implement Von Neumann measurement to achieve the scheme,which is simple in technology and easy to operat e.2.A secure mobile electronic payment protocol based on genuinely six qubits entanglement states is proposed.Our protocol makes use of the characteristics of quantum blind signature,so that the privacy consumption information of customer is not leaked during the process of mobile electronic payment.In addition,the properties of quantum multi-proxy signature are utilized to make customers realize electronic payment in multiple mobile terminals,which can improve the convenience of consumer life.Only Bell state measurement is required to implement the protocol,which is easy to implement under current experimental conditions.3.A quantum third-party electronic payment protocol is designed based on quantum multi-proxy blind signature.This protocol can guarantee that private information of consumers in the process of payment can be blind,and consumers can realize electronic payment on multiple third-party platforms.Besides,the security analysis shows that the protocol also satisfies undeniability and unforgeability.