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IEEE Signal Processing Letters

Secure Transmission in Cooperative Networks with Weak Eavesdroppers

Albert Sunny, Siddhartha Sarma, Joy Kuri B

Published Apr 22, 2015• 4 citations
Publisher

Abstract

In this letter, we propose a scheme to improve the secrecy rate of cooperative networks using Analog Network Coding (ANC). ANC mixes the signals in the air; the desired signal is then separated out, from the mixed signals, at the legitimate receiver using techniques like self interference subtraction and signal nulling, thereby achieving better secrecy rates. Assuming global channel state information, memoryless adversaries and the decode-and-forward strategy, we seek to maximize the average secrecy rate between the source and the destination, subject to an overall power budget. Then, exploiting the structure of the optimization problem, we compute its optimal solution. Finally, we use numerical evaluations to compare our scheme with the conventional approaches.

DOI
10.1109/lsp.2015.2425043

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In this letter, we propose a scheme to improve the secrecy rate of cooperative networks using Analog Network Coding (ANC). ANC mixes the signals in the air; the desired signal is then separated out, from the mixed signals, at the legitimate receiver using techniques like self interference subtraction and signal nulling, thereby achieving better secrecy rates. Assuming global channel state information, memoryless adversaries and the decode-and-forward strategy, we seek to maximize the average secrecy rate between the source and the destination, subject to an overall power budget. Then, exploiting the structure of the optimization problem, we compute its optimal solution. Finally, we use numerical evaluations to compare our scheme with the conventional approaches.
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In this paper, we consider a two-way relay system in which two users exchange data via a relay based on analog network coding (ANC) when multiple eavesdroppers exist. The relay replenishes energy from the two users’ signal and utilizes it to forward the ANC signal to each user. Each user removes its own signal from the received signal through self-interference cancellation and decodes the desired data signal. On the other hand, the eavesdroppers overhear the relaying signal and attempt to recover the data of two users. For this ANC-based two-way relay network with multiple eavesdroppers, we propose two secure ANC protocols: power splitting-ANC (PS-ANC) and time switching-ANC (TS-ANC), in which the relay determines the power splitting ratio ($\alpha )andtimeswitchingratio() and time switching ratio ()andtimeswitchingratio(\beta ),respectively,tobalancebetweentheenergyharvestingandthedatareception.Theoptimal), respectively, to balance between the energy harvesting and the data reception. The optimal),respectively,tobalancebetweentheenergyharvestingandthedatareception.Theoptimal\alpha andandand\beta foreachprotocolareobtainedanalyticallytomaximizetheminimumachievablesecrecyrate(for each protocol are obtained analytically to maximize the minimum achievable secrecy rate (foreachprotocolareobtainedanalyticallytomaximizetheminimumachievablesecrecyrate(S_{\text {min}})inconsiderationofmultipleeavesdroppers.AnalyticalresultsshowthatboththePS−ANCandTS−ANCprotocolswiththeoptimal) in consideration of multiple eavesdroppers. Analytical results show that both the PS-ANC and TS-ANC protocols with the optimal)inconsiderationofmultipleeavesdroppers.AnalyticalresultsshowthatboththePS−ANCandTS−ANCprotocolswiththeoptimal\alpha andandand\beta accomplishthenear−optimalaccomplish the near-optimalaccomplishthenear−optimalS_{\text {min}}$irrespective of the locations and number of eavesdroppers. The comparison of these two protocols in various network environments exhibits that PS-ANC has a better performance than TS-ANC when the network conditions are unfavorable for wiretapping by the eavesdroppers.
This paper exploits physical layer network coding (PNC) and friendly jamming to improve their physical layer security in wireless two-hop cooperative communications, consisting of one source-destination pair with the help of multiple intermediate nodes in the presence of one eavesdropper. By sending a jamming signal carrying a random binary message from the selected jammer and utilizing the PNC at the selected relay node, the system can avoid the disadvantage of the friendly jamming to the source-relay channel and do good to the relay-destination channel, thereby achieving better secrecy rate. Assuming global channel state information available and memoryless adversaries, we seek to minimize the secrecy outage probability with the optimal relay and jammer selection. Numerical simulation results show that our schemes outperform the conventional approaches in wireless cooperative communications.
In this paper, we investigate physical layer network coding (PNC) and destination assisted cooperative jamming (DACJ) for physical layer security in wireless sensor networks, in which there is one source, one destination, a cluster of intermediate nodes, and multiple eavesdroppers. Under the PNC protocol, the considered two-hop wireless sensor network implements a complete transmission process in two phases. In the first phase, through sending a jamming signal from the destination and exploiting the PNC at the relay, the relay decodes the exclusive-OR (XOR) performed form of the source and the jamming message. Therefore, the jamming signal can degrade the wire-tap channels without hampering the legitimate channel. In the second phase, the relay transmits the re-encoded message to the destination while eavesdroppers are out of work as they cannot extract information from the signal. Thus, the proposed design can significantly improve the performance of secure wireless communications. Meanwhile, the proposed schemes select one optimal node from the intermediate nodes and give an optimal solution of power allocation to maximize secrecy capacity. Numerical simulation results show that the proposed schemes have a better and more stable secrecy performance than the conventional schemes at the same power consumption.
This paper investigates cooperative security in wireless networks, where a source (Alice) intends to transmit a confidential message to a legitimate destination (Bob), with the help of a cooperative jammer (Charlie), coexisting with multiple passive eavesdroppers (Eves). In particular, by assuming knowledge of Bob's perfect channel state information (CSI) but only Eves’ statistical CSIs, secrecy beamforming with artificial noise (AN) is utilized for secure transmission, and cooperative jamming (CJ) is explored to further enhance secrecy. We first derive an accurate closed-form expression for the secrecy outage probability (SOP), and establish the condition under which positive secrecy rate is achievable. Then, we provide a secure transmit design for maximizing the SOP constrained secrecy rate. Moreover, based on a strict mathematical analysis, we characterize the impact of the main channel quality and the number of Eves on transmit design and secrecy performance. Specifically, optimal power allocation ratio between the information-bearing signal and the AN signal increases as the main channel quality improves, and decreases with the number of Eves. Numerical results confirm that our design achieves performance improvement in terms of both secrecy rate and secure energy efficiency, as compared to the approach without CJ.
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