Abstract
Recently, Lang put forward for the first time a quantum gate-based quantum private comparison (QPC) protocol (Int J Theor Phys, 59(2020)833) which uses the quantum controlled-not gates to implement comparison instead of classical exclusive-or computations. It was claimed that this quantum gate-based QPC protocol is secure against both the outside attack and the participant attack. However, in this paper, it is pointed out that this protocol cannot resist a special measurement attack from the third party (TP) and the disturbance attack from an outside attacker. The corresponding improvements are further suggested to remedy these security loopholes.
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Ming-Yi, D. Cryptanalysis and Improvement of Quantum Gate-Based Quantum Private Comparison. Int J Theor Phys 60, 195–199 (2021). https://doi.org/10.1007/s10773-020-04675-y
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DOI: https://doi.org/10.1007/s10773-020-04675-y