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A note on “new quantum key agreement protocols based on Bell states”

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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

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Acknowledgements

We are grateful to the reviewers for their valuable suggestions.

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Authors and Affiliations

  1. Department of Mathematics, Shanghai University, Shangda Road 99, Shanghai, 200444, China

    Zhengjun Cao

  2. Computer Sciences Department, Université Libre de Bruxelles, Boulevard du Triomphe - CP 212, 1050, Bruxelle, Belgium

    Olivier Markowitch

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  1. Zhengjun Cao
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  2. Olivier Markowitch
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Correspondence to Zhengjun Cao.

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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

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