Abstract
The fairness of a secure multi-party quantum key agreement (MQKA) protocol requires that all involved parties are entirely peer entities and can equally influence the outcome of the protocol to establish a shared key wherein no one can decide the shared key alone. However, it is found that parts of the existing MQKA protocols are sensitive to collusion attacks, i.e., some of the dishonest participants can collaborate to predetermine the final key without being detected. In this paper, a multi-party QKA protocol resisting collusion attacks is proposed. Different from previous QKA protocol resisting \(N-1\) coconspirators or resisting 1 coconspirators, we investigate the general circle-type MQKA protocol which can be secure against t dishonest participants’ cooperation. Here, \(t < N\). We hope the results of the presented paper will be helpful for further research on fair MQKA protocols.
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Notes
For the single state, it can be considered as the entangled states where parts of them \(R_{i}\) have already been measured.
For the single state, it can be considered as the entangled states where parts of them have already been measured.
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Acknowledgements
This work is funded by the National Natural Science Foundation of China (No. 61602316, 61402293), the Science and Technology Innovation Projects of Shenzhen (No. JCYJ20150324141711665 and No. JCYJ20150324141711694), Natural Science Foundation of SZU (No. 201435), and China Postdoctoral Science Foundation (No. 2015M572360).
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Wang, P., Sun, Z. & Sun, X. Multi-party quantum key agreement protocol secure against collusion attacks. Quantum Inf Process 16, 170 (2017). https://doi.org/10.1007/s11128-017-1621-z
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DOI: https://doi.org/10.1007/s11128-017-1621-z