Abstract
Recently, Luo et al. make a detailed analysis on the security of quantum sealed-bid auction with post-confirmation protocol (Quantum Information Processing, Volume 11, Issue 6, pp 1359–1369, 2012) and present the corresponding improved strategy for its loophole. Unfortunately, we find their improved version is still not as secure as expected, since it is vulnerable to malicious bidders in collusion with the auctioneer. And there is an unreasonable suspicion in the honesty of the auctioneer for special situation. Then we propose an improved strategy, which can perfectly defeat kinds of attacks.
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