The Research Of Electronic Payment Procotol Based On Quantum Blind Signature

Information science has been widely used in various fields,the problem of information security has become increasingly prominent with the rapid development of information science.Electronic payment has become an important part of e-commerce with the advent of the new century,and the key link of e-commerce transaction is how to choose a safe and reliable electronic payment way.Therefore,the researcher has been concerned how to realize electronic payment safely and conveniently.The key technologies of blind signature and group signature are mostly used in the existing electronic payment system.However,in classical cryptography,group signature and blind signature schemes are mostly based on computational complexity.The security of this algorithm and scheme based on classical cryptography will be threatened with the continuous improvement of computer capability.The unconditional security of quantum cryptography and the detectability of eavesdropping contribute to quantum signature overcome the shortcomings of classical signature with the emergence of quantum information and the rapid development of quantum cryptography technology.This thesie studies the scheme of applying quantum signature technology to electronic payment.The main work is as follows:1.On the basis of quantum information theory,the technology of quantum blind signature and proxy signature is applied to electronic payment scheme combining with the actual demand of electronic payment.This thesis proposes a third-party electronic payment scheme based on quantum proxy blind signature.In this scheme,a secure quantum channel is constructed by quantum six-particle entanglement state.By using Bell state measurement and appropriate unitary transformation,the controllable quantum teleportation is accomplished,so that the original signer can authorize multiple proxy signers to sign the payment information.Finally,the security of the protocol is analyzed in detail,including the blindness of the signature message,the unforgeability of the message(internal and external attacks)and the non-repudiation,which proves the unconditional security of the protocol.2.The thesis analysis the vulnerabilities of electronic payment scheme based on quantum multi-proxy blind signature,which proposed by Shao Aixia in 2017.And we put forward some improvement methods.The security analysis proves that there is a security loophole in the electronic payment scheme based on quantum blind signature,which opposes the security requirements claimed by the author in the protocol.In this scheme,the businessman Bob can forge the signature content,and then,the participants can not distinguish whether the customer Alice denies the message that she wants to sign or Bob forges the signature content.In order to solve this problem,this thesis proposes a corresponding method to repair the vulnerabilities,which can improve the security and reliability of the protocol when fulfilling the task requirements of the protocol.