Research On Quantum Signature Authentication Without Arbitratio

Quantum signature is a vital problem in quantum cryptography,which has been widely used in financial services,e-commerce and other fields.Most of the existing quantum signature protocols are designed to ensure the security by introducing arbitrator.However,the excessive authority of arbitrator can reduce the practicality of the protocol.The problem of designing quantum signature protocols without arbitrator is researched in the thesis.The main research contents and main contributions are as follows:A single signer quantum signature protocol without arbitrator is designed based on the LIOP state.In this protocol,by introducing a novel local indistinguishable orthogonal product state(LIOP state),the validity of a signature is verified under the condition that two semi-honest verifiers cooperate.The security analysis shows that the protocol is resistant to forgery and denial attacks by the participants.A multiple signers quantum signature protocol without arbitrator is designed based on the SNOP state.In this protocol,a strong nonlocal orthogonal product(SNOP)state is introduced to verify the validity of signatures with multiple signers and multiple verifiers.The analysis shows that the protocol is also secure and resistant to collusive forgery attacks by participants.Compared with the quantum signature protocol based on entanglement,the novel quantum signature protocol proposed in this thesis makes full use of the individual transmission of the locally indistinguishable orthogonal product states and the overall non-local property.The states have better security and is easy to prepare and implement.