Quantum Proxy Blind Signature And Its Application In Electronic Payment

Digital signature is an important part of cryptosystem,which plays an important role in information security technology.Digital signature not only can protect data integrity,but also is the basis of network identity authentication and undeniable technology.It is also an important tool for e-commerce to develop and sign e-protocol.Because the classical digital signature cannot satisfy the unconditional security,researchers put forward a variety of quantum theory-based cryptographic protocols.Quantum informatics is a subject combining quantum mechanics and information theory.With the development and progress of quantum computer,people gradually realize that quantum cryptography has a higher security than classical cryptography.Therefore,those researches on signature schemes and various quantum e-payment protocols based on quantum theory have attracted people's attention and increased the development of cryptography.In this thesis,we mainly study quantum signature and e-payment.We present the proxy blind signature and multi-bank e-payment protocol.Using six-particle entangled state as quantum channel,we propose a proxy blind signature with quantum information in two particle state and multi-bank e-payment protocols.The research results are as follows:1.Based on the controlled quantum teleportation,a proxy blind signature protocol is proposed with quantum information carried by two particle states.The scheme uses a real six-particle entangled state as the quantum channel.Combined with one-time pad algorithm,Von-Neumann measurements,quantum key distribution,quantum Hash function ensure the security of the protocol.The scheme can be applied to many places,such as e-voting,e-government,e-auction and e-commerce.2.Based on quantum proxy blind signature,a multi-bank third-party e-payment protocol is proposed.The efficiency of the scheme is improved by using two particle unitary operation and Von-Neumann measurement,and a large number of resources can be saved.One-time pad algorithm is used to protect the information of customers.Compared with the traditional e-payment protocol,the quantum e-payment protocol can not only protect the anonymity of users,but also provide them with different banks to complete their transactions.