Abstract
Recently, Ye and Jiang (Chin Phys Lett 30(4):040305, 2013) proposed two controlled bidirectional quantum direct communication protocols by using a Green–Horne–Zeilinger state and a Bell state. This paper shows that a malicious user, Bob, can obtain the other user’s secret message without the controller’s permission by performing an intercept-and-resend attack. An improvement is then proposed to avoid this problem.
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Acknowledgments
We would like to thank the Ministry of Science and Technology of Republic of China for financial support of this research under Contract No. MOST 103-2221-E-006-177.
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Chang, CH., Luo, YP., Yang, CW. et al. Intercept-and-resend attack on controlled bidirectional quantum direct communication and its improvement. Quantum Inf Process 14, 3515–3522 (2015). https://doi.org/10.1007/s11128-015-1050-9
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DOI: https://doi.org/10.1007/s11128-015-1050-9