Journal
IEEE PHOTONICS JOURNAL
Volume 7, Issue 2, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2015.2402158
Keywords
Atmospheric turbulence; free-space optical communications; physical-layer security; scintillation; secrecy
Funding
- Junta de Andalucia [P11-TIC-7109]
- Spanish Government [COFUND2013-40259, TEC2013-44442-P]
- University of Malaga
- European Union under Marie-Curie COFUND U-mobility program [246550]
- Spanish Ministerio de Economia y Competitividad [TEC2012-36737]
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The communication between two legitimate peers in the presence of an external eavesdropper is studied from a physical-layer security perspective in the context of free-space optical (FSO) communications. We discuss viable mechanisms to eavesdrop the communication and study the effect of random optical irradiance fluctuations inherent to FSO communications on the probability of achieving a secure transmission. We observe that the joint effect of laser-beam divergence and turbulence-induced fading on the received irradiance, under certain conditions, allows an external eavesdropper close to the legitimate receiver to compromise the communication. Interestingly, we also observe that an eavesdropper placed close to the legitimate transmitter can easily compromise the communication by taking advantage of the larger attenuation suffered by the signal when propagating through the FSO link.
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