Research On Quantum Proxy Blind Signature And Quantum Voting Scheme

In the information age,there are more and more incidents of obtaining information by illegal means,which seriously affects the development of our country's economy,politics and military,and also affects the quality of our individual digital survival.Therefore,the issues related to information security have become the focus of people's attention.In the application level,information security mainly includes information confidentiality and information authentication.Information security can be achieved by encryption technology,while information authentication is mainly achieved by the important technology of digital signature in cryptography.In the commercialized modern society,information authentication is more important.This promotes the development of digital signature in cryptography.With the development of quantum computers and their algorithms,the security of classical digital signature schemes based on computational complexity is seriously threatened.In order to enhance the security of this kind of signature scheme,researchers turn to the research of quantum signature,hoping that quantum signature can replace the classical signature and provide the unconditional security of signature.At present,the research of quantum signature is relatively immature in cryptography,and it is still one of the research hotspots.In this thesis,five particle quantum entangled state is used as quantum communication channel to study quantum signature scheme and its application in voting.The research results are as follows:1.Based on the physical characteristics of quantum mechanics,this thesis proposes a quantum proxy blind signature scheme using random sequence of blind messages.This scheme uses five particle entangled state as the quantum communication channel,and efficiently completes the secure transmission of quantum state messages.The efficiency and security of the scheme are greatly improved by introducing a trusted third party,using only von neumann measurement,and enhancing the blindness of the message.It can be widely used in commercial,military and other fields,with strong practical value.2.Based on the previous signature research,this thesis uses five particle entangled state as the quantum channel to directly transmit two bits of quantum state messages,arranges the eavesdropping detection of quantum channel,and designs an efficient quantum multi-agent blind signature scheme.The signature process is realized by combining quantum key distribution protocol,quantum measurement and quantum control stealth tradition.It will be more widely used in real life.3.Based on the characteristics of group signature and blind signature,a quantum voting scheme is designed.Using this scheme to vote can not only activate the number of voters,but also enable voters to fully express their opinions or suggestions on the election.In addition,it can also enhance the anonymity and privacy of the message owner,greatly improve the efficiency and security,simple operation,easy to implement,and make it more in line with the needs of real voting.