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Nature Physics

The other sight

Federico Levi

Published Sep 1, 2014• 1 citation
Publisher
DOI
10.1038/nphys3087

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60 GHz 无线电的技术被考虑为快提供答应连接和 gigabit 数据评价。对它的安全室内的传播的主要挑战之一是怎么产生在通讯设备之间的秘密钥匙。调查这个问题，作者开发基于 60 个 GHz 标准隧道模型利用 multipath 亲戚延期的秘密关键产生的有效机制。在 line-of-sight (LOS ) 和环境被考虑的 non-line-of-sight (NLOS ) 之间的关键失配的概率的比较。建议计划的确认被进行。提取 multipath 部件的数字按比例确实影响了的模拟表演给产生率和关键失配的概率调音。它也显示交流收发器比处于 LOS 状况处于 NLOS 状况有稍微更低的关键失配的可能性。而且与把收到的信号振幅用作普通随机的来源的存在途径相比，机制能在关键同意完成更好的性能。
Abstract This work investigates physical-layer security of underwater wireless optical communication systems under covert non-line-of-sight (NLOS) eavesdropping caused by scattered photons. A first-order single-scattering model is developed for the near-transmitter NLOS eavesdropping link by incorporating seawater absorption, scattering, beam divergence, receiver field of view, and Eve’s geometry. Turbulence-induced fading on the legitimate line-of-sight link is also considered. Based on photon-counting detection, secrecy capacity, interception probability, and secrecy outage probability are analyzed. Results show that stronger scattering enlarges the high-risk region of NLOS information leakage, while stronger Bob-link turbulence degrades the secrecy performance of the system. A comparison with multiple-scattering Monte Carlo photon tracing for Jerlov IB and Jerlov II waters shows close agreement in the dominant spatial photon-count distribution.
In this paper, we consider a hybrid fading model in which line of sight (LOS) component is available between the transmitter and legitimate receiver and assume that eavesdropper is not in LOS from the transmitter. We analyze probability of existence of secrecy and secrecy outage probability for the case that the channels to the legitimate receiver are κ-μ faded and the channels to eavesdropper are Rayleigh faded. We present closed form expressions for existence of secrecy and a lower bound on secrecy outage probability when legitimate receiver and eavesdropper uses maximal ratio combining (MRC) diversity scheme to improve their performances in fading conditions. Results of analytical expressions are verified by an agreement of the results from simulation. Finally, it is concluded that the presence of LOS component improves secrecy of the system and stronger LOS component betters the secrecy.