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.

中文翻译：

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量子密封拍卖的密码分析与改进

分析了先前提出的量子密封投标拍卖 (QSA) 协议的安全性。表明可能存在恶意竞拍人扰乱拍卖，向拍卖人发送真实竞拍，向其他竞拍人进行虚假竞拍。因此，这些诚实的投标人可能会错误地认为拍卖师不诚实。为了避免这个安全漏洞，我们提出了一种改进的协议，可以更完美地满足QSA的安全性。