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IEEE Military Communications Conference (MILCOM)

Physical layer security for cooperative relaying in broadcast networks

Liang Chen

Published Nov 1, 2011• 9 citations
Publisher

Abstract

In this paper, we study the physical layer security for cooperative relaying in broadcast networks. We analyze two cooperative strategies, the decode-and-forward scheme and the compress-and-forward scheme. We can use decode-and-forward scheme only if the nodes which have both good communication channels from the source and high security clearance are chosen to serve as relays; otherwise, we cannot achieve physical layer security. While the compress-and-forward scheme is used, we can achieve physical layer security even though the relays have lower levels of security clearance than the destinations. We provide an achievable rate-equivocation region for this case.

DOI
10.1109/milcom.2011.6127796

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In this paper, we study the physical layer security for cooperative relaying in broadcast networks. We analyze two cooperative strategies, the decode-and-forward scheme and the compress-and-forward scheme. We can use decode-and-forward scheme only if the nodes which have both good communication channels from the source and high security clearance are chosen to serve as relays; otherwise, we cannot achieve physical layer security. While the compress-and-forward scheme is used, we can achieve physical layer security even though the relays have lower levels of security clearance than the destinations. We provide an achievable rate-equivocation region for this case.
This paper studies the transmission rates and physical layer security of cooperative relay networks. For any relay network, there are natural information theoretic cut-set bounds, which upper bound the transmission rates. We further tighten the outer bounds on rate regions. We also study the achievable rate regions in consideration of physical layer security. We analyze two cross-group cooperative strategies with decode- and-forward relaying and compress-and-forward relaying respectively. We can use the decode-and-forward scheme only if the users which have both good communication channels from the source and high levels of security clearance are selected to serve as relays; otherwise, we cannot achieve physical layer security. While the compress-and-forward scheme is used, physical layer security can be achieved even though the relays have lower security clearance than the destinations.
This paper studies secure communication over the broadcast channels with an untrusted relay. The relay helps users with transmission in broadcast channels, but we also wish to keep the information secret against the relay. Compress-and-forward relaying is a potential strategy to achieve secrecy. We obtain the achievable rate-equivocation regions by combining it with Marton's coding scheme and Cover's superposition coding scheme respectively. The secrecy rate region based on Marton's coding scheme provides a general result, without knowing information regarding two users. If we know which user is better (i.e. receiving more information), we can design a simpler scheme with superposition encoding. Outer bound to the rate-equivocation regions is also provided in this paper.
In this paper, we investigate the physical layer security of single amplify-and-forward (AF) relay communication system based on compressed sensing (CS). Different to the traditional method by compressing the source data with a specific measurement matrix (e.g. Gaussian matrix)to achieve security, we first demonstrate that the combination matrix of the compression measurement matrix and cooperative AF channel matrix between legitimate nodes (source, relay, and destination) can be considered as a secure measurement matrix for physical layer security. Compared with CS scenario without AF (CS Non-AF), the eavesdropper in the proposed scheme can hardly decode the original data correctly even when it has a perfect knowledge of eavesdropper channel state information (ECSI). The robustness of the scheme in the presence of one eavesdropper is also investigated.
Relay selection for physical layer security is investigated in Decode-and-forward (DF) two-way relay networks, consisting of a group of intermediate nodes, two sources, and one eavesdropper. Three intermediate nodes are selected in the two transmission phases. One intermediate node is selected to perform the relaying operation, and the other two are selected to transmit the jamming to deteriorate the eavesdropping channels. It is found that the cooperative jamming scheme outperforms the conventional non-jamming scheme in the common scenario, where the intermediate nodes are distributed dispersedly. However, when the intermediate nodes cluster gets close to the sources, it is not superior any more due to the strong interference on the destinations. Therefore, an instantaneous switching between the nonjamming scheme and the jamming scheme is proposed to avoid the negative interference. The hybrid scheme is validated to well improve the secrecy performance of DF two-way relay networks via simulation analyses.
We employed node cooperation in a cooperative wireless network to achieve physical layer- based security. The case of a source-destination pair that works with the assistance of multiple cooperating nodes in the presence of an eavesdropper was considered in this study to improve the performance of secure wireless communications. A novel cooperative scheme, called the decode-and-forward plus cooperative jamming (DFCJ), was proposed. In this scheme, relay nodes transmit a weighted version of the source signals plus a common weighted jamming signal to confound the eavesdropper. The novel system design was proposed to determine cooperative node weights and transmit power allocation. In DFCJ, a closed-form solution is obtained to minimize the total transmit power that is subjected to a secrecy rate constraint under complete nulling of jamming signals at the destination. The results of the numerical evaluation of the transmit power and the obtained secrecy rate show that the proposed scheme can significantly improve the performance of wireless physical layer security compared with the original decode-and-forward scheme.
In this paper, three different relay and jammers selection schemes are presented to improve the physical layer security of two-way cooperative networks in the presence of multiple cooperating and non-cooperating eavesdroppers. The presented selection schemes are; optimal selection scheme without jamming, optimal selection scheme with conventional jamming, and optimal selection scheme with controlled jamming. The proposed schemes select three intermediate nodes during two communication phases. In the first phase, a friendly jammer is selected to create intentional interference at the eavesdroppers' nodes. In the second phase, two relay nodes are selected; one node is selected to operate as a conventional relay and assists the sources to deliver their data to the corresponding destinations via a Decode-and-Forward (DF) strategy. While the other node behaves as a jammer node in order to confuse the eavesdroppers in this phase. The proposed schemes are analyzed in terms of ergodic secrecy rate and secrecy outage probability. The obtained results show that the jamming schemes outperform the non-jamming schemes in the eavesdroppers' environment. Moreover, cooperating eavesdroppers' further degrade system's secrecy performance than the non-cooperating ones. Finally, a comparison between relay and jammers selection schemes in both one-way and two-way cooperative networks is given in terms of both ergodic secrecy rate and secrecy outage probability metrics.