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International Wireless Communications and Mobile Computing Conference (IWCMC)

Secrecy Performance of Short Packet Communications: Wiretap Channel with Multiple Receivers and Eavesdroppers

Nihan Arı, Nikolaos Thomos, Leila Musavian

Published May 30, 2022• 3 citations
Publisher

Abstract

In this paper, we study the secrecy performance of short packet secure communications over a fading wiretap channel when there are multiple receivers and eavesdroppers. In particular, we evaluate and compare the performance of colluding and non-colluding eavesdropping modes, in terms of achievable secrecy throughput. Our aim is to determine whether eavesdroppers' collusion degrades the average secrecy throughput compared to a non-colluding scenario. After deriving closed-form approximations on average secrecy throughput for both scenarios, Monte-Carlo simulations are performed to obtain the accuracy of each approximation. Our results reveal that the impact of colluding eavesdroppers on the average secrecy throughput causes more loss than a non-colluding case, especially with the increasing number. Besides, an increased number of receivers does not eliminate the negative impact of eavesdroppers.

DOI
10.1109/iwcmc55113.2022.9825203

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In this paper, we study the secrecy performance of short packet secure communications over a fading wiretap channel when there are multiple receivers and eavesdroppers. In particular, we evaluate and compare the performance of colluding and non-colluding eavesdropping modes, in terms of achievable secrecy throughput. Our aim is to determine whether eavesdroppers' collusion degrades the average secrecy throughput compared to a non-colluding scenario. After deriving closed-form approximations on average secrecy throughput for both scenarios, Monte-Carlo simulations are performed to obtain the accuracy of each approximation. Our results reveal that the impact of colluding eavesdroppers on the average secrecy throughput causes more loss than a non-colluding case, especially with the increasing number. Besides, an increased number of receivers does not eliminate the negative impact of eavesdroppers.
This paper studies the performance of short packet communications in the presence of multiple eavesdroppers. We start our investigation by examining the fading wiretap channel, where the communication is overheard by multiple non-colluding single antenna eavesdroppers. A closed-form expression for the average secrecy throughput is derived, when the transmitter has a single antenna. The Monte-Carlo simulations show a close match of the analytical expression with the numerical results. Moreover, the optimal blocklength value that maximizes the secrecy throughput is determined, when the communication is observed by single and multiple eavesdroppers. We then extend our analysis for the case of a multiple-antenna transmitter and consider artificial noise (AN) to confuse the eavesdroppers. A closed-form expression for the average secrecy throughput is obtained for the scenario of a two-antenna transmitter and two eavesdroppers with a single antenna. The results demonstrate the validity of the approximation when compared with Monte-Carlo simulations. The results further reveal that an increased number of antennas at the transmitter is associated with higher average secrecy throughput and applying AN helps to eliminate the harm of the eavesdroppers.
The wiretap channel model in a wireless scenario is analyzed where there is a transmitter, multiple legitimate receivers, non-colluding and colluding eavesdroppers; each of them is equipped with one antenna. Furthermore, all the channels are mutually independent and experiencing quasi-static Nakagami-m fading. We derive closed-form expressions for the exact secrecy outage probability as well as the average secrecy capacity with both non-colluding and colluding eavesdroppers. Such performance metrics are used to analyze the impacts of the number of receivers and eavesdroppers on the system. Remarkably, our results reveal that, for non-colluding eavesdroppers, increasing the number of users will cause greater secrecy degradation than the number of eavesdroppers, especially when the main channel is far superior to the wiretap channel or the value of the fading parameter is high. And for the colluding case, it turns out to be the opposite.
In this paper, we investigate secure short packet transmission from a legitimate transmitter to a receiver in the presence of an active eavesdropper. The aim is to gain more insights into how an active eavesdropper affects the secrecy throughput of short packet communications. The eavesdropper is assumed to have full-duplex (FD) capability, which enables performing eavesdropping and jamming simultaneously. All the communication links in the wiretap channel are assumed to be Rayleigh fading. An approximation of the average achievable secrecy throughput is proposed to measure the security of the system. The proposed approximation is examined and analysed in two different topology scenarios, which are triangular and line topologies. Then, Monte-Carlo simulations are performed to get an understanding of how good the approximation is. The results show that the closed-form expressions have a good match with Monte-Carlo simulations. We also investigate the impact of the eavesdropper's distance to the legitimate nodes as well as the different jamming power levels. Furthermore, self-interference influence on the eavesdropper is discussed.
This paper studies the problem of secure communication from a transmitter to a receiver with the use of short packets under the existence of multiple eavesdroppers, who are overhearing the transmission. We assume that the eavesdroppers are mutually independent. Further, we consider that the main channel and eavesdropper channels are Rayleigh fading, then use the performance metric of average secrecy throughput to measure how secure the communication is. We derive a closed form approximation of the average secrecy throughput in the presence of multiple eavesdroppers. Finally, the approximation is validated through simulations and we have seen that the approximation is very close to the corresponding simulation results.
This paper studies the physical-layer security (PLS) of a system model consisting of a transmitter, a receiver, and multiple eavesdroppers. Cascaded general fading channel, which is the κ-μ distribution is assumed at the main and the wiretap links of the network. The impacts of the cascade level, the number of eavesdroppers attempting to overhear the confidential information, and the wiretap channel's parameters on the system's secrecy are investigated. Two of the main secrecy metrics are used to evaluate the secrecy level of the system, which are the secrecy outage probability (OPsec) and the probability of non-zero secrecy capacity (Pnsc). Exact and asymptotic form expressions for (OPsec) and (Pnsc) are derived. Asymptotic analysis is performed to gain a clear vision about the impact of some key parameters over the secrecy. The results show that the fading channel cascade level has a significant effect on the system's secrecy. Also, the results show that the system is less protected when increasing the number of eavesdroppers or when improving the wiretap channel's conditions. Analytical results are validated using Monte-Carlo simulations.
The performance of physical-layer security of the classic Wyner's wiretap model over Fisher-Snedecor F composite fading channels is considered in this work. Specifically, the main channel (i.e., between the source and the legitimate destination) and the eavesdropper's channel (i.e., between the source and the illegitimate destination) are assumed to experience independent quasi-static Fisher-Snedecor F fading conditions, which have been shown to be encountered in realistic wireless transmission scenarios in conventional and emerging communication systems. In this context, exact closed-form expressions for the average secrecy capacity (ASC) and the probability of non-zero secrecy capacity (PNSC) are derived. Additionally, an asymptotic analytical expression for the ASC is presented. The impact of shadowing and multipath fading on the secrecy performance is investigated. Our results show that increasing the fading parameter of the main channel and/or the shadowing parameter of the eavesdropper's channel improves the secrecy performance. The analytical results are compared with Monte-Carlo simulations to validate the analysis.