Numerical Study on Secrecy Capacity and Code Length Dependence of the Performances in Optical Wiretap Channels

Endo, Hisao; Han, Te Sun; Aoki, Takao; Sasaki, Masahide

doi:10.1109/jphot.2015.2472281

Cited by 39 publications

(23 citation statements)

References 32 publications

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“…It has been verified that physical layer security (PLS) technology can prevent illegitimate receivers from eavesdropping due to the time-varying nature of the wireless medium [4]- [8]. Numerical studies of PLS over FSO satellite ground systems were performed by Endo et al [9]. They showed that secrecy communications were possible and that there can be a complementary technologies to balance security and usability issues.…”

mentioning

confidence: 99%

Secrecy Outage Analysis of Mixed RF-FSO Downlink SWIPT Systems

Lei

Dai

Park

et al. 2018

IEEE Trans. Commun.

107

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We analyze a secure dual-hop mixed radio frequency-free space optical (RF-FSO) downlink simultaneous wireless information and power transfer (SWIPT) systems. The FSO link and all RF links experience Gamma-Gamma, independent and identical Nakagami-m fading, respectively. We analyze the effects of atmospheric turbulence, pointing error, detection technology, path loss, and energy harvesting on secrecy performance. Signal-to-noise ratios at both legitimate and illegitimate receivers are not independent since they are both simultaneously influenced by the FSO link. We derive the closedform expression of the secrecy outage probability (SOP) as well as the asymptotic result for SOP when signal-to-noise ratios at relay and legitimate destinations tend to infinity. Monte-Carlo simulations are performed to verify the accuracy of our analysis. The results show that the secrecy diversity order (SDO) depends on the fading parameter of the relay-destination link and the number of the destination's antennas. Additionally, the SDO also depends on the fading parameters, the pointing error parameter, and the detection type of the FSO link. Index Terms-Physical layer security, mixed RF-FSO systems, Gamma-Gamma fading, Nakagami-m fading, simultaneous wireless information and power transfer, secrecy outage probability. I. INTRODUCTION A. Background and Related Works Dual-hop mixed radio frequency-free space optical (RF-FSO) systems are designed to overcome atmospheric turbulence and other factors limiting the applications of FSO systems. They can also effectively improve communication coverage, save spectrum resources, avoid relocating devices, and are considered as a powerful candidate for next generation Manuscript received.

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confidence: 99%

Secrecy Outage Analysis of Mixed RF-FSO Downlink SWIPT Systems

Lei

Dai

Park

et al. 2018

IEEE Trans. Commun.

107

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“…At this point it's necessary to reference a numerical study conducted by the Sasaki research team in Japan wherein they reported secrecy capacity and secure key rate performance when using channel codes in an optical wiretap scenario for geostationary satellite to ground links. Taking into account power and bandwidth constraints and using channel attenuation as the main degradation source, they showed that information-theoretic secure communications could be possible at very long distances [13]. This work was followed by a very recent series of comprehensive experimental demonstrations of secure message transmissions over a metropolitan 7.8 km terrestrial FSO link in the presence of an eavesdropping attack [14]- [16].…”

Section: Optical Wiretap Channel Scenariomentioning

confidence: 99%

Physical-Layer Security of a Binary Data Sequence Transmitted With Bessel–Gaussian Beams Over an Optical Wiretap Channel

Wang

Djordjević

2018

IEEE Photonics J.

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When an eavesdropper performs an optical beam-splitting attack in a freespace optical communications channel, it is referred to as an optical wiretap channel, which is an extension of Wyner's wiretap channel model. Even though physical-layer security can be compromised, it is possible to exploit the noisy and degraded channel conditions experienced by the eavesdropper to obtain positive secrecy capacity even when a shared secret key is not used. In our previous work, we found that employing Bessel-Gaussian beams can help to improve physical-layer security and provide higher secrecy capacity over that of Laguerre-Gaussian beams in a turbulent free-space optical communications channel. In this companion paper, we conducted an experiment exclusively with Bessel-Gaussian beams onto which we encoded a pseudorandom binary sequence to emulate data transmission over this optical wiretap channel. Bit-error rate curves for the intended receiver and the eavesdropper were calculated from which estimates of secrecy capacity were derived. We found that the bit-error rate curves for the eavesdropper were consistently worse than those of the intended receiver under several turbulence conditions and that further evidence of an error floor even when the eavesdropper uses an optical amplifier is promising for secure communications.

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“…Analysis results show that the joint effect of laser-beam divergence and turbulence-induced fading on the received irradiance allows an external Eve close to the legitimate receiver to compromise the communication. Secrecy issues of FSO links realizing information-theoretic security and high transmission rates are discussed in [13]. It is shown that, under reasonable degraded conditions, information theoretically secure communications should be possible in a much wider distance range than the range limit of quantum key distribution.…”

Section: Introductionmentioning

confidence: 99%

Design and Investigation of 10 Gb/s FSO Wiretap Channel Using OCDMA Time-Diversity Reception

Zhang

et al. 2020

IEEE Photonics J.

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In this paper, 10 Gb/s free space optical (FSO) wiretap channel using optical code division multiple access (OCDMA) time-diversity reception is designed and demonstrated for the first time. Reliability and security are investigated under weak and strong turbulence conditions. Two-dimensional optical encoder and decoder are constructed by wavelength selective switches and optical delay lines, and one-dimensional optical encoder and decoder are constructed by couplers and tunable optical delay lines. Experimental results show that reliability and security can be enhanced simultaneously using OCDMA time-diversity reception. At the received power of 2.58 dBm in strong turbulence, compared to non-diversity system, bit error rate (BER) of legitimate user in OCDMA time-diversity system is reduced from 3.9 × 10 −7 to 6.73 × 10 −8. Furthermore, the reliability improvement is more obvious when the correlation between the two signals of OCDMA time-diversity is smaller. The secrecy capacity can be increased from 0.546 bit/symbol to 0.665 bit/symbol in strong turbulence when received power is 2.28 dBm. On the other hand, the secrecy capacity of strong turbulence is about 15% higher than that of weak turbulence.

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Numerical Study on Secrecy Capacity and Code Length Dependence of the Performances in Optical Wiretap Channels

Cited by 39 publications

References 32 publications

Secrecy Outage Analysis of Mixed RF-FSO Downlink SWIPT Systems

Secrecy Outage Analysis of Mixed RF-FSO Downlink SWIPT Systems

Physical-Layer Security of a Binary Data Sequence Transmitted With Bessel–Gaussian Beams Over an Optical Wiretap Channel

Design and Investigation of 10 Gb/s FSO Wiretap Channel Using OCDMA Time-Diversity Reception

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