Research On Quantum Confidentiality Comparison Protocol

Quantum private comparison protocol is an important brand of quantum secure multi-party computing.The main purpose of this study is to compare the secret information of two or more participants and not to disclose the secret information of the participants.Firstly,based on the analysis and summary of the existing protocols,a twoparty quantum private comparison protocol is designed based on d-level single photon.Then the correctness and security analysis are proved in this paper.In the further theoretical analysis of quantum private comparison protocol,we use single photon to complete our protocol,which has high efficiency and practicability.Secondly,the scope of the study is expanded from two parties to n participants.In order to make readers better understand the process of confidentiality comparison,we summarize two basic models named circle model and tree model in the multi-party quantum private comparison protocols.The security requirements of quantum private comparison protocols can be satisfied in our models.Then multi-party quantum private comparison protocols based on circle model and tree model are proposed.The private comparison task is completed among n participants.This paper also gives detailed correctness analysis and security analysis.It is proved theoretically that the proposed protocols can obtain correct comparison results and resist outside attack,participant attack(including a semi-honest third party attack).And compared with the existing protocols,our protocols will be more efficient.We hope that the proposed protocols would be positive for the design of quantum private comparison protocols.