Research On Privacy-Preserving And Post-Confirmation Of Quantum Sealed-Bid Auction

Quantum secure multi-party computing is a popular research field with rich achievements in quantum cryptography.Quantum auction is an important application in the field of quantum security multi-party computing,which has gradually attracted widespread attention.It uses the excellent characteristics of quantum information technology to ensure the security,robustness and efficiency of the entire auction system.Quantum sealed-bid auction is a kind of quantum auction,which usually consists of an auctioneer and multiple bidders.All bidders encode their bids into a quantum sequence and send it to the auctioneer in secret.After that,the auctioneer compares the highest bid.In the quantum sealed-bid auction process,the true bids of legitimate bidders may leak.A malicious bidder conspiring with the auctioneer will violates the fairness of the auction.The issues of privacy and fairness mentioned above make the practical feasibility of quantum sealed-bid auction difficult.Therefore,the research on the privacy protection and post-confirmation mechanism of quantum sealed-bid auction has very important practical significance.This thesis focuses on the privacy-preserving and post-confirmation mechanism of quantum sealed-bid auction.The main work includes the following two aspects:(1)A strong privacy-preserving quantum sealed-bid auction protocol is designed.Firstly,based on the quantum private comparison protocol,a strong privacy-preserving quantum sealed-bid auction protocol is proposed.The thesis solves the problem of weak privacy protection for quantum sealed-bid auctions and strengthens the privacy of bids.Furthermore,the protocol uses a bulletin board to replace the traditional high-cost post-confirmation mechanism,which greatly reduces the complexity of quantum communication and improves the practical feasibility.After that,we analyze the security of the protocol and prove that the protocol can complete the sealed auction task fairly.Finally,we confirm the superiority of the protocol in privacy protection and efficiency.(2)A quantum sealed bid auction protocol based on quantum secret sharing is designed.Considering that the existing post-confirmation mechanism is not practical,high consumption,and misjudgment,we propose a flexible and efficient post-confirmation mechanism combined with quantum secret sharing.We applied the post-confirmation mechanism to the quantum sealed-bid auction protocol and designed a detailed auction protocol.After that,we analyze the security of the protocol and prove that the protocol can complete the sealed auction task fairly.Finally,we confirm the superiority of the protocol in efficiency and practicability.