Cryptanalysis and Improvement of Quantum Sealed Bid Auction
The security of previously proposed Quantum Sealed bid Auction (QSA) protocols is analyzed. It is shown that there may be a malicious bidder to disrupt the auction that he sends a true bid to auctioneer and commits a fake bid to other bidders. Consequently, these honest bidders may mistakenly think the auctioneer is dishonest. To avoid this security flaw, we propose an improved protocol which can more perfectly meet the security of QSA.