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Cited by 774

The DOI matches its Crossref record; 15 of the 15 references it cites were found in a registry or an index.

The Relay–Eavesdropper Channel: Cooperation for Secrecy

Open access
Lai, Lifeng, El Gamal, Hesham·2008·IEEE Transactions on Information Theory

Abstract

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.

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Metadata

Authors
Lai, L., & El Gamal, H.
Venue
IEEE Transactions on Information Theory
Published
2008-09
Volume
54
Issue
9
Pages
4005-4019
ISSN
0018-9448 (ISSN-L)
OpenAlex
W2142102521
Cited by
774
References
15
FWCI
51.10
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: The Relay–Eavesdropper Channel: Cooperation for Secrecy. https://app.cochat.ai/papers/10.1109/tit.2008.928272
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Lai, L., & El Gamal, H. (2008). The Relay–Eavesdropper Channel: Cooperation for Secrecy. IEEE Transactions on Information Theory. https://doi.org/10.1109/tit.2008.928272

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Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.