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Physical-layer security analysis of PSK quantum-noise randomized cipher in optically amplified links

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Abstract

The quantitative security of quantum-noise randomized cipher (QNRC) in optically amplified links is analyzed from the perspective of physical-layer advantage. Establishing the wire-tap channel models for both key and data, we derive the general expressions of secrecy capacities for the key against ciphertext-only attack and known-plaintext attack, and that for the data, which serve as the basic performance metrics. Further, the maximal achievable secrecy rate of the system is proposed, under which secrecy of both the key and data is guaranteed. Based on the same framework, the secrecy capacities of various cases can be assessed and compared. The results indicate perfect secrecy is potentially achievable for data transmission, and an elementary principle of setting proper number of photons and bases is given to ensure the maximal data secrecy capacity. But the key security is asymptotically perfect, which tends to be the main constraint of systemic maximal secrecy rate. Moreover, by adopting cascaded optical amplification, QNRC can realize long-haul transmission with secure rate up to Gb/s, which is orders of magnitude higher than the perfect secrecy rates of other encryption systems.

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Acknowledgements

This work is partly supported by the National Natural Science Foundation of China (Grant Nos. 61475193, 61504170, 61671306) and Natural Science Foundation of Jiangsu Province (BK20140069).

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Authors and Affiliations

  1. College of Communications Engineering, PLA University of Science and Technology, Nanjing, 210007, China

    Haisong Jiao, Tao Pu, Peng Xiang, Jilin Zheng, Tao Fang & Huatao Zhu

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  1. Haisong Jiao
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  2. Tao Pu
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  3. Peng Xiang
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  4. Jilin Zheng
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  6. Huatao Zhu
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Correspondence to Jilin Zheng.

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Jiao, H., Pu, T., Xiang, P. et al. Physical-layer security analysis of PSK quantum-noise randomized cipher in optically amplified links. Quantum Inf Process 16, 189 (2017). https://doi.org/10.1007/s11128-017-1637-4

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  • DOI: https://doi.org/10.1007/s11128-017-1637-4

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