Comment on "Efficient and feasible quantum private comparison of equality against the collective amplitude damping noise"

Authors:
Chun-Wei Yang;Shih-Hung Kao;Tzonelih Hwang
Affiliations:
Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan City, Taiwan, ROC 701;Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan City, Taiwan, ROC 701;Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan City, Taiwan, ROC 701
Venue:
Quantum Information Processing
Year:
2013

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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.