Abstract
Recently, Chen et al. [Quant Inf Proc doi: 10.1007/s11128-012-0505-5 ] presented a very promising quantum private comparison protocol for two participants to compare the equality of their wealth secretly--no one, except the participants, can reveal the comparison result. This paper points out that a malicious participant can reveal portion of the other participant's secret information. Furthermore, an improvement is also proposed.
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