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Comment on “Controlled Bidirectional Quantum Secure Direct Communication with Six-Qubit Entangled States”

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Abstract

In the controlled bidirectional quantum secure direct communication, two users can successfully exchange their private messages only when a third party permits. Recently, a controlled bidirectional quantum secure direct communication protocol with six-qubit entangled states was proposed (Int. J. Theor. Phys. 60(8), 2943–2950 2021). It claimed that, in the protocol, the participant Bob can decode Alice’s private message only with Charlie’s agreement. However, in this comment, it is pointed out that Bob can decode Alice’s private message without needing Charlie’s agreement by constructing an intercept-and-resend attack. Furthermore, to resist the constructed attack, an improving strategy is suggested. The comment can help designers of such protocols avoid similar mistakes in the future.

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Fig. 1
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Data Availability

The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author (E-mail: xf.zou@hotmail.com).

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Acknowledgements

This work was supported in part by the National Natural Science Foundations of China (Nos. 61871205 and 11874312), the Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515012623), the Innovation Project of Department of Education of Guangdong Province of China (No. 2017KTSCX180), the Science and Technology Project of Jiangmen City of China (No. 2021030101270004596), and the Joint Research and Development Fund of Wuyi University, Hong Kong and Macao (No. 2021WGALH16).

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Authors and Affiliations

  1. School of Mathematics and Computational Science, Wuyi University, Jiangmen, 529020, China

    Xiangfu Zou, Jianfeng Liu & Ying Chen

  2. Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China

    Xin Wang

  3. City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China

    Xin Wang

  4. Faculty of Intelligent Manufacturing, Wuyi University, Jiangmen, 529020, China

    Zhenbang Rong

  5. School of Economics and Management, Wuyi University, Jiangmen, 529020, China

    Zhiming Huang

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  1. Xiangfu Zou
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  5. Jianfeng Liu
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Correspondence to Xiangfu Zou or Xin Wang.

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Zou, X., Wang, X., Rong, Z. et al. Comment on “Controlled Bidirectional Quantum Secure Direct Communication with Six-Qubit Entangled States”. Int J Theor Phys 62, 43 (2023). https://doi.org/10.1007/s10773-022-05273-w

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