Abstract
In a recent paper (Cai et al. in Quantum Inf Process 17:103, 2018), a multi-party quantum key agreement with five-qubit Brown states was presented. We analyzed the security of this protocol and found that it is insecure because the fairness requirement is not satisfied. To illustrate it, a new participant attack is proposed, in which two dishonest participants conspire to decide the agreement key fully. Finally, a feasible improvement of this quantum key agreement protocol is given.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 61772134, 61976053), the China Postdoctoral Science Foundation Funded Project (Grant No. 2016M600494), the Natural Science Foundation of Fujian Province (Grant Nos. 2016J01288, 2018J01776), the Probability and Statistics: Theory and Application (Grant No. IRTL1704), and the Program for Innovative Research Team in Science and Technology in Fujian Province University.
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Lin, S., Guo, GD., Chen, AM. et al. Cryptanalysis of multi-party quantum key agreement with five-qubit Brown states. Quantum Inf Process 18, 358 (2019). https://doi.org/10.1007/s11128-019-2472-6
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DOI: https://doi.org/10.1007/s11128-019-2472-6