Research On Multi-party Quantum Signature Protocols

Quantum signature is an important direction of quantum cryptography,which can be used to preserve the integrity of data.It not only sign messages,but also provide identity authentication.It is also an important guarantee to prevent information fraud.Quantum signature has been developed for 20 years.Its application is more and more extensive.The specific application research of multiparty quantum signature scheme is also developing gradually.Based on the analysis of multi-party quantum signature schemes,this paper systematically analyzes and summarizes multi-party quantum signature schemes,as follows:A recently proposed multi-party quantum signature scheme based on single photon state is analyzed and studied.The scheme needs the user and the certification authority to jointly generate the final signature and no entangled resources are required.The analysis results show that there are problems in the correctness and security of the scheme.Concretely,non-commutative of the signature operators design can lead to errors in signature verification,and the signature cannot resist the forgery attack of the verifier.In this paper,we give an improved scheme by using the commutative operation and adding a trusted third-party Trent.Safety analysis shows that our scheme can resist the forgery attack of the verifier.Multi party quantum signature technology is applied to quantum payment theory.This paper proposes a multi-party quantum payment scheme based on W-state.Compared with the general scheme,this scheme does not require all participants to have all quantum capabilities.The verifier only needs two operations: z-basis measurement and returning particles to complete the signature verification.This greatly reduces the technical requirements required by the verifier and makes the scheme more practical.The analysis shows that the scheme buyers can not deny their payment information,and the scheme can resist forgery attacks.