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Multi-Party Quantum Private Comparison Protocol with an Almost-Dishonest Third Party using GHZ States

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Abstract

This article proposes an innovative quantum private comparison (QPC) protocol for n users using GHZ states, where an almost-dishonest third party (TP) is introduced to assist the participants for comparing their secrets. It is argued that as compared to the existing QPC protocols our proposed scheme has some considerable advantages. First, in the existing QPC protocols, the TP can only to determine whether all participants’ secrets are equal or not. Instead of that, in our proposed scheme a TP can even compare the secrets between any subsects of users. Second, since our proposed scheme is based on GHZ state; hence it can ensure higher efficiency as compared to other existing multi-party QPC protocols on d-dimension photons.

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Authors and Affiliations

  1. Tainan City, Taiwan, Taiwan, Republic of China

    Sheng-Liang Huang, Tzonelih Hwang & Prosanta Gope

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  1. Sheng-Liang Huang
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  2. Tzonelih Hwang
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  3. Prosanta Gope
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Correspondence to Tzonelih Hwang.

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Huang, SL., Hwang, T. & Gope, P. Multi-Party Quantum Private Comparison Protocol with an Almost-Dishonest Third Party using GHZ States. Int J Theor Phys 55, 2969–2976 (2016). https://doi.org/10.1007/s10773-016-2929-7

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  • DOI: https://doi.org/10.1007/s10773-016-2929-7

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