Research On Quantum Signature And Electronic Payment

With the continuous development and rapidly popularization of computer and Internet,information exchange has been penetrated into all aspects of society and linked people together.People become more dependent on information exchange.The security requirement for information exchange is also getting higher and higher.However,with the advent of quantum computer,the security of some classical com-munication secrecy mechanism based on mathematical theory has been threatened.As a result,people begin to study quantum cryptography and quantum signatures whose security are based on their physical properties.In order to protect privacy of the message and anonymity of the signer,blind signature,proxy signature and group signature schemes have been proposed.Compared with classical cryptog-raphy,quantum cryptography can satisfy unforgeability,undeniability and uncon-ditional security.Combining the specific characteristics of proxy signature,blind signature and group signature,two schemes are proposed:a proxy blind signature scheme;a third-party quantum E-payment protocol.The results are as follows:1.A quantum proxy blind signature scheme based on controlled teleportation is proposed in this thesis.Genuine seven-qubit entangled state functions as quantum channel.The scheme has an original signer and a proxy signer.During the signature process,the message is always blinded.The scheme not only guarantees the security of the signature,but also guarantees the integrity of the message.Security anal-ysis shows that our scheme meets characteristics of the proxy blind signature and unconditional security.Different from some existing quantum signature schemes,we introduce a trust party to guarantee the security of the scheme.The number of measurements has also decreased.Under current experimental conditions,our scheme can be realized and widely applied.2.Combined with the actual demand for E-payment,we propose a third-party quantum E-payment protocol based on quantum group blind signature.Not only does it support E-payment among different banks,but also it improves credibility of the transaction and success rate of the business.The payment protocol can protect the anonymity of the E-payment system and implement unconditional security.Our scheme only need Bell-measurement and single particle measurement,and it can be easily implemented with current experimental conditions.