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Enhanced quantum private comparison

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Abstract

Quantum private comparison (QPC) is judging whether two secrets are equal or not without any information leakage. This paper suggests that the privacy is reflected in the three pieces of information—value, data length, and bits equality. However, existent QPC protocols generally just keep the first item, i.e. value secret, whereas the other two is revealed. This work insists that it should be forbidden for a true QPC protocol. For this purpose, the paper firstly proposes a novel concept of enhanced quantum private comparison (EQPC), which protects not only secrets’ specific value, but also their data length and bits equality, and then presents a novel protocol implementing EQPC. The proposed EQPC protocol was fully analysed correct and secure. Also, it is extremely easy to implement for its only usage of one type of Bell states. It can be said that the EQPC protocol is a significant step forward for the QPC development.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The author Yan-Feng Lang thanks Daughter Lang Duo-Zi for her support on this work.

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  1. School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, 310018, People’s Republic of China

    Yan-Feng Lang

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Lang, YF. Enhanced quantum private comparison. Quantum Inf Process 22, 308 (2023). https://doi.org/10.1007/s11128-023-04069-z

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