Abstract
Security and privacy are two main dominant features of any communication system. In this paper, physical layer security of free space optical communication system using chaotic modulation scheme i.e., differential chaos shift keying (DCSK) is analyzed, where eavesdropper is actively present near the receiver and interfering between the transmission of secret messages from a transmitter to the receiver. In this manuscript, we have derived analytical expressions for the average secrecy capacity and secrecy outage probability which is used as a metric for secrecy performance analysis. The channel characterization is carried out using gamma–gamma model for weak-to-strong turbulence conditions. The effect of physical layer parameters like transmission link length, spreading length, etc. are considered for evaluating the security performance of the system. Numerical analysis is carried out and graphical results are presented. The results depicted that a very good average secrecy capacity can be achieved even in the presence of eavesdropper, however, it requires a tradeoff between high signal-to-noise ratio of main channel and large values of spreading factor. The proposed system is very promising for the future secured communication systems.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
References
1. Kaushal, H, Jain, VK, Kar, S. Free space optical communication. India: Springer; 2017.10.1007/978-81-322-3691-7Search in Google Scholar
2. Wang, N, Song, X, Cheng, J, Leung, VC. Enhancing the security of free-space optical communications with secret sharing and key agreement. J Opt Commun Netw 2014;6:1072. https://doi.org/10.1364/jocn.6.001072.Search in Google Scholar
3. Lopez-Martinez, FJ, Gomez, G, Garrido-Balsells, JM. Physical-layer security in free-space optical communications. IEEE Photon J 2015;7:1–14.10.1109/JPHOT.2015.2402158Search in Google Scholar
4. Endo, H, Fujiwara, M, Kitamura, M, Ito, T, Toyoshima, M, Takayama, Y, et al.. Free-space optical channel estimation for physical layer security. Opt Express 2016;24:8940–55.10.1364/OE.24.008940Search in Google Scholar PubMed
5. Boluda-Ruiz, R, García-Zambrana, A, Castillo-Vázquez, B, Qaraqe, K. Secure communication for FSO links in the presence of eavesdropper with generic location and orientation. Opt Express 2019;27:34211. https://doi.org/10.1364/oe.27.034211.Search in Google Scholar
6. Yun, A, Mathur, A, Kong, L, Cheffena, M. Secure outage analysis of FSO communications over arbitrarily correlated Málaga turbulence channels. IEEE Trans Veh Technol 2021;70:3961–5. https://doi.org/10.1109/tvt.2021.3066219.Search in Google Scholar
7. Wu, H, Ma, J, Guo, P, Wang, Q, Kang, D, Yang, J, et al.. Secrecy outage probability analysis in a free-space optical system based on partially coherent beams through anisotropic non-Kolmogorov turbulent atmosphere. J Opt Soc Am B 2022;39:1378. https://doi.org/10.1364/josab.452857.Search in Google Scholar
8. Wang, Y, Tong, Y, Zhan, Z. On secrecy performance of mixed RF-FSO systems with a wireless-powered friendly jammer. IEEE Photon J 2022;14:1–8. https://doi.org/10.1109/jphot.2022.3146019.Search in Google Scholar
9. Menezes, AJ, Oorschot, PCV, Vanstone, SA. Handbook of applied cryptography. USA: CRC Press, Inc.; 1996.Search in Google Scholar
10. Bloch, M, Barros, J. Physical-layer security: from information theory to security engineering. New York: Cambridge University Press; 2011.10.1017/CBO9780511977985Search in Google Scholar
11. Shannon, CE. Communication theory of secrecy systems. Bell Syst Tech J 1949;28:656–715. https://doi.org/10.1002/j.1538-7305.1949.tb00928.x.Search in Google Scholar
12. Wyner, AD. The wire-tap channel. Bell Syst Techn J 1975;54:1355–87.10.1002/j.1538-7305.1975.tb02040.xSearch in Google Scholar
13. Csiszar, I, Korner, J. Broadcast channels with confidential messages. IEEE Trans Inf Theor 1978;24:339–48. https://doi.org/10.1109/tit.1978.1055892.Search in Google Scholar
14. Leung-Yan-Cheong, S, Hellman, M. The Gaussian wire-tap channel. IEEE Trans Inf Theor 1978;24:451–6. https://doi.org/10.1109/TIT.1978.1055917.Search in Google Scholar
15. Qiu, P, Chen, X, Shi, Y. Detecting entanglement with deep quantum neural networks. IEEE Access 2019;7:94310–20. https://doi.org/10.1109/ACCESS.2019.2929084.Search in Google Scholar
16. Obeed, M, Salhab, AM, Alouini, MS, Zummo, SA. Survey on physical layer security in optical wireless communication systems. In: 2018 seventh international conference on communications and networking (ComNet). IEEE; 2018.10.1109/COMNET.2018.8622294Search in Google Scholar
17. Shakir, WMR, Abdulkareem, RA. A survey on physical layer security for FSO communication systems. In: Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7–9 Sep 2021, Sakarya, Turkey. EAI; 2022.10.4108/eai.7-9-2021.2314809Search in Google Scholar
18. Shakir, WMR, Alouini, M-S. Secrecy performance analysis of parallel FSO/mm-wave system over unified Fisher-snedecor channels. IEEE Photon J 2022;14:1–13.10.1109/JPHOT.2022.3151675Search in Google Scholar
19. Wang, Y, Zhan, Z, Shen, Z. On secrecy performance of SWIPT energy-harvesting relay jamming based mixed RF-FSO systems. Photonics 2022;96:374.10.3390/photonics9060374Search in Google Scholar
20. Zou, D, Xu, Z. Information security risks outside the laser beam in terrestrial free-space optical communication. IEEE Photon J 2016;8:1–9. https://doi.org/10.1109/jphot.2016.2607699.Search in Google Scholar
21. Saber, MJ, Sadough, SMS. On secure free-space optical communications over Málaga turbulence channels. IEEE Wireless Commun Lett 2017;6:274–7. https://doi.org/10.1109/lwc.2017.2671872.Search in Google Scholar
22. Wang, T-L, Gariano, JA, Djordjevic, IB. Employing Bessel-Gaussian beams to improve physical-layer security in free-space optical communications. IEEE Photon J 2018;10:1–13. https://doi.org/10.1109/jphot.2018.2867173.Search in Google Scholar
23. Monteiro, MEP, Rebelatto, JL, Souza, RD, Brante, G. Maximum secrecy throughput of MIMOME FSO communications with outage constraints. IEEE Trans Wireless Commun 2018;17:3487–97. https://doi.org/10.1109/twc.2018.2815021.Search in Google Scholar
24. Zhao, Y, Li, J, Zhong, X, Shi, H. Physical-layer security in fractional orbital angular momentum multiplexing under atmospheric turbulence channel. Opt Express 2019;27:23751. https://doi.org/10.1364/oe.27.023751.Search in Google Scholar
25. Ai, Y, Mathur, A, Verma, GD, Kong, L, Cheffena, M. Comprehensive physical layer security analysis of FSO communications over Málaga channels. IEEE Photon J 2020;12:1–17. https://doi.org/10.1109/jphot.2020.3036244.Search in Google Scholar
26. Verma, GD, Mathur, A, Ai, Y, Cheffena, M. Secrecy performance of FSO communication systems with non-zero boresight pointing errors. IET Commun 2020;15:155–62. https://doi.org/10.1049/cmu2.12068.Search in Google Scholar
27. Trinh, PV, Carrasco-Casado, A, Pham, AT, Toyoshima, M. Secrecy analysis of FSO systems considering misalignments and eavesdropper’s location. IEEE Trans Commun 2020;68:7810–23. https://doi.org/10.1109/tcomm.2020.3023465.Search in Google Scholar
28. Boluda-Ruiz, R, Tokgoz, SC, García-Zambrana, A, Qaraqe, K. Enhancing secrecy capacity in FSO links via MISO systems through turbulence-induced fading channels with misalignment errors. IEEE Photon J 2020;12:1–13. https://doi.org/10.1109/jphot.2020.2987378.Search in Google Scholar
29. Sikri, A, Mathur, A, Bhatnagar, M, Saxena, P, Nebhen, J. Artificial noise injection–based secrecy improvement for FSO systems. IEEE Photon J 2021;13:1–12. https://doi.org/10.1109/jphot.2021.3060974.Search in Google Scholar
30. Lau, FCM, Tse, CK. Chaos-based digital communication systems. Berlin, Heidelberg, New York: Springer-Verlag; 2003.10.1007/978-3-662-05183-2Search in Google Scholar
31. Grzybowski, JMV, Eisencraft, M, Macau, EEN. Chaos-based communication systems: current trends and challenges. In: Applications of chaos and nonlinear dynamics in engineering. Berlin Heidelberg: Springer-Verlag; 2011, vol. 1:203–30 pp.10.1007/978-3-642-21922-1_7Search in Google Scholar
32. Cuomo, KM, Oppenheim, AV. Chaotic signals and systems for communications. In: 1993 IEEE international conference on acoustics, speech, and signal processing. Minneapolis, MN, USA; 1993.10.1109/ICASSP.1993.319454Search in Google Scholar
33. Tao, Y. A survey of chaotic secure communication systems. Int J Comput Cognit 2004;2:81–130.Search in Google Scholar
34. Rulkov, NF, Vorontsov, MA, Illing, L. Chaotic free-space laser communication over a turbulent channel. Phys Rev Lett 2002;89:277905. https://doi.org/10.1103/physrevlett.89.277905.Search in Google Scholar PubMed
35. Annovazzi-Lodi, V, Aromataris, G, Benedetti, M, Merlo, S. Secure chaotic transmission on a free-space optics data link. IEEE J Quant Electron 2008;44:1089–95. https://doi.org/10.1109/jqe.2008.2001929.Search in Google Scholar
36. Ghosh, AK, Verma, P, Cheng, S, Huck, RC, Chatterjee, MR, Al-Saedi, M. Design of acousto-optic chaos based secure free-space optical communication links. In: Proceedings Volume 7464, Free-Space Laser Communications IX; 74640L. San Diego, California, United States: SPIE; 2009.10.1117/12.826813Search in Google Scholar
37. Sepantaie, MM, Namazi, NM, Sepantaie, AM. Spectral analysis and implementation of secure chaotic free-space optical communication systems. Opt Eng 2018;57:1. https://doi.org/10.1117/1.oe.57.10.106101.Search in Google Scholar
38. Li, M, Hong, Y, Wang, S, Song, Y, Sun, X. Radiation-induced mismatch effect on performances of space chaos laser communication systems. Opt Lett 2018;43:5134. https://doi.org/10.1364/ol.43.005134.Search in Google Scholar PubMed
39. Abdulameer, LF. Optical CDMA coded STBC based on chaotic technique in FSO communication systems. Radioelectron Commun Syst 2018;61:454–66. https://doi.org/10.3103/s0735272718100035.Search in Google Scholar
40. Narang, G, Aggarwal, M, Kaushal, H, Ahuja, S. The probability of error in FSO communication system using differential chaos shift keying. Phys Commun 2019;34:220–6. https://doi.org/10.1016/j.phycom.2019.03.014.Search in Google Scholar
41. Kong, L, Georges, K, Taha, M. Performance analysis of physical layer security of chaos-based modulation schemes. In: 2015 IEEE 11th international conference on wireless and mobile computing, networking and communications (WiMob). IEEE; 2015.10.1109/WiMOB.2015.7347973Search in Google Scholar
42. Narang, G, Aggarwal, M, Kaushal, H, Ahuja, S. Error probability analysis of FSO communication system using differential chaos shift keying. In: 2018 5th international conference on signal processing and integrated networks (SPIN). Noida, IndiaFeb: IEEE; 2018.10.1109/SPIN.2018.8474235Search in Google Scholar
43. Aggarwal, M, Garg, P, Puri, P. Ergodic capacity of SIM-based DF relayed optical wireless communication systems. IEEE Photon Technol Lett 2015;27:1104–7. https://doi.org/10.1109/lpt.2015.2407897.Search in Google Scholar
44. Ai, Y, Mathur, A, Cheffena, M, Bhatnagar, MR, Lei, H. Physical layer security of hybrid satellite-FSO cooperative systems. IEEE Photon J 2019;11:1–14. https://doi.org/10.1109/jphot.2019.2892618.Search in Google Scholar
45. Lei, H, Zhang, H, Ansari, IS, Gao, C, Guo, Y, Pan, G, et al.. Performance analysis of physical layer security over generalized- K fading channels using a mixture Gamma distribution. IEEE Commun Lett 2015;20:408–11.10.1109/LCOMM.2015.2504580Search in Google Scholar
46. Bloch, M, Barros, J, Rodrigues, MR, McLaughlin, SW. Wireless information-theoretic security. IEEE Trans Inf Theor 2008;54:2515–34.10.1109/TIT.2008.921908Search in Google Scholar
47. Prudnikov, AP, Brychkov, YA, Marichev, OI. Integrals and series. New York, NY, USA: Gordon & Breach; 1990.Search in Google Scholar
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