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.
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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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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DOI: https://doi.org/10.1007/s10773-022-05273-w