Abstract
We present experimental data on message transmission in a free-space optical (FSO) link at an eye-safe wavelength, using a testbed consisting of one sender and two receiver terminals, where the latter two are a legitimate receiver and an eavesdropper. The testbed allows us to emulate a typical scenario of physical-layer (PHY) security such as satellite-to-ground laser communications. We estimate information-theoretic metrics including secrecy rate, secrecy outage probability, and expected code lengths for given secrecy criteria based on observed channel statistics. We then discuss operation principles of secure message transmission under realistic fading conditions, and provide a guideline on a multi-layer security architecture by combining PHY security and upper-layer (algorithmic) security.
Highlights
Free-space optical (FSO) communication is a promising technology for enhancing the connectivity of wireless networks [1], thanks to the features such as wide band width in an unregulated spectrum, ultra-low inter-channel interference, and power-efficient transmission
We focus on secure message transmission and analyze the characteristics of the FSO wiretap channel by transmitting a pseudorandom binary sequence based on on-off keying modulation
To characterize the instantaneous secrecy rate RS,i, we divide the duration of each 200 ms transmission into 50 of the 4 ms slot which includes 2 × 105 samples corresponding to 4 × 104 bits
Summary
Free-space optical (FSO) communication is a promising technology for enhancing the connectivity of wireless networks [1], thanks to the features such as wide band width in an unregulated spectrum, ultra-low inter-channel interference, and power-efficient transmission. In FSO links, the intensity of the transmitted beam and the statistics of the received signals vary in a time scale of ms due to atmospheric turbulences This kind of fading effect makes it difficult to implement an efficient coding scheme which can ensure PHY security un-. The purposes of the testbed are (1) to examine PHY security techniques (e.g., secure message transmission and secret key agreement) in real-field FSO links, (2) to emulate typical FSO communication scenarios such as satellite-to-ground laser communications, and (3) to accumulate transmission data under several real-field conditions and utilize them for practical system design. We discuss how the legitimate party can set a guideline for operating secure message transmission based on the observed data with pilot signals and the data accumulated from the past
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