Abstract
We remark that the quantum key agreement protocol (Yang et al. in Quantum Inf Process 18(10):322, 2019) is flawed. It is unnecessary for Bob to prepare his secret key \(K_B\), because it is finally announced and accessible to adversaries. We find, \(K_B\) has no relation to the confidentiality of the final agreed key \(K_{AB}=K_A\oplus K_B\). It is just a key transfer scheme, not a general key agreement scheme. We also find there is short of a code for Bob to extract bits from the measured results.
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References
Bennett, C., Brassard, G.: Quantum cryptography, public key distribution and coin tossing. In: Proceedings of IEEE International Conference on Computers, Systems and Signal Processing, pp. 175–179 (1984)
Liu, L., Cao, Z., Markowitch, O.: On the fundamental difference between encryption and key establishment. Int. J. Electron. Inf. Eng. 11(2), 99–105 (2019)
Menezes, A., Oorschot, P., Vanstone, S.: Handbook of Applied Cryptography. CRC Press, Boca Raton (1996)
Yang, Y., et al.: New quantum key agreement protocols based on Bell states. Quantum Inf. Process. 18(10), 322 (2019)
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We are grateful to the reviewers for their valuable suggestions.
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This comment refers to the article available online at https://doi.org/10.1007/s11128-019-2434-z
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Cao, Z., Markowitch, O. A note on “new quantum key agreement protocols based on Bell states”. Quantum Inf Process 20, 74 (2021). https://doi.org/10.1007/s11128-021-03004-4
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DOI: https://doi.org/10.1007/s11128-021-03004-4