Abstract
We investigate the quantum sealed-bid auction protocol proposed by Zhao et al. (Opt Commun 283:1394, 2010). It uses M groups n-particle GHZ states to represent bids and a post-confirmation mechanism to guarantee the honesty of the quantum sealed-bid auction. However, in our opinion the protocol still does not complete the task of a sealed-bid auction fairly. It is shown that a large group of dishonest bidders can collude to obtain all the other one’s secret bids before the opening phase of the auction with a probability polynomially close to one. Moreover, a simple feasible improvement of the protocol is proposed.
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He, LB., Huang, LS., Yang, W. et al. Cryptanalysis and melioration of secure quantum sealed-bid auction with post-confirmation. Quantum Inf Process 11, 1359–1369 (2012). https://doi.org/10.1007/s11128-011-0275-5
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DOI: https://doi.org/10.1007/s11128-011-0275-5