The Relay–Eavesdropper Channel: Cooperation for Secrecy

By Lifeng Lai, Hesham El Gamal. IEEE Transactions on Information Theory, 2006

792 citations recorded by the source corpus.

This paper establishes the utility of user cooperation in facilitating secure wireless communications. In particular, the four-terminal relay-eavesdropper channel is introduced and an outer-bound on the optimal rate-equivocation region is derived. Several cooperation strategies are then devised and the corresponding achievable rate-equivocation region are characterized. Of particular interest is the novel noise-forwarding (NF) strategy, where the relay node sends codewords independent of the source message to confuse the eavesdropper. This strategy is used to illustrate the deaf helper phenomenon, where the relay is able to facilitate secure communications while being totally ignorant of the transmitted messages. Furthermore, NF is shown to increase the secrecy capacity in the reversely degraded scenario, where the relay node fails to offer performance gains in the classical setting. The gain offered by the proposed cooperation strategies is then proved theoretically and validated numerically in the additive white Gaussian noise (AWGN) channel.

Subfields: Computer Networks and Communications, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/934e1c4c121599f031c53f39e1f884e8f3e87d35

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Citations in the corpus

Joint Relay and Jammer Selection for Secure Two-Way Relay Networks (2011, background): “In, several cooperative jamming schemes were investigated for different scenarios to increase the secrecy capacity of networks with secrecy constraints.”
On the Secrecy Capacity of Fading Channels (2006, background): “In particular, the secrecy capacity of networks involving relay nodes is studied in [11], [ 12 ], while the secrecy capacity of the wiretap channel with feedback is studied by [13].”
Transmit Antenna Selection for Security Enhancement in MIMO Wiretap Channels (2013, result): “These applications are in contrast to military applications for secure communications where the eavesdropper is in general assumed to have infinite resources [29].”
Hiding information in noise: fundamental limits of covert wireless communication (2015, background): “Thus, jammers have been shown to facilitate information-theoretically secrecy by confusing the eavesdropper even while being completely ignorant of the messages exchanged by legitimate communicating parties [13].”
Towards the Secrecy Capacity of the Gaussian MIMO Wire-Tap Channel: The 2-2-1 Channel (2007, background): “, multiple access channel [11]–[15], broadcast channel [16], relay channel [17], [18], interference channel [19], and two-way channel [20], and in fading channels [7], [21]–[25] have been considered recently.”
Discrete Memoryless Interference and Broadcast Channels With Confidential Messages: Secrecy Rate Regions (2007, positive): “The relay-eavesdropper channel has been proposed in [12].”
Multiple-Access Channels With Confidential Messages (2008, background): “The wiretap channel was introduced by Wyner in [2], in which a sender wishes to transmit information to a legitimate receiver and to keep a wiretapper as ignorant of this information as possible.”
Cooperative Jamming for Secure Communications in MIMO Relay Networks (2011, background): “In [20], a noise-forwarding strategy is introduced for a four-terminal relay-eavesdropper channel where the full-duplex relay sends codewords independent of the secret message to confuse the eavesdropper.”
On Cooperative Relaying Schemes for Wireless Physical Layer Security (2010, background): “A generalization of [13] and [14] was proposed in [15], in which the helper transmits signals from another source encoder.”
Optimal Relay Selection for Physical-Layer Security in Cooperative Wireless Networks (2013, background): “In [13], the cooperation strategy was further examined to enhance the physical-layer security and a so-called noise-forwarding scheme was proposed, where the relay node attempts to send codewords independent of the source message to confuse the eavesdropper.”
Secure Transmission With Artificial Noise Over Fading Channels: Achievable Rate and Optimal Power Allocation (2010, background): “In the scenario where the transmitter has a helping interferer or a relay node, the secrecy level can also be increased by having the interferer [14] or relay [15] to send codewords independent of the source message at an appropriate rate.”
Classifications and Applications of Physical Layer Security Techniques for Confidentiality: A Comprehensive Survey (2019, methodology): “This is ensured only if the rates are chosen wisely with respect to the legitimate user [151].”
A Survey on Multiple-Antenna Techniques for Physical Layer Security (2017, background): “Lai and Gamal [118] proposed a noise-forwarding (NF) relaying protocol, where the relay sends signals independent of the source message.”
Physical Layer Security for Next Generation Wireless Networks: Theories, Technologies, and Challenges (2017, background): “Through the exploitation of relay cooperative strategies [62], such as decode and forward (DF), amplify and forward (AF), noise and forward (NF), and compress and forward (CF), relays can enhance the secrecy capacities of wireless networks.”
Relay selection for secure cooperative networks with jamming (2009, background): “This symmetric con ﬁ guration focuses our study on the relaying links and has been introduced in [13] in order to reveal the secrecy bene ﬁ ts of relaying when the secrecy capacity for the direct links is zero.”