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The relay-eavesdropper channel: Cooperation for secrecy (2006)
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| Venue: | IEEE Trans. on Inf. Theory |
| Citations: | 158 - 7 self |
BibTeX
@ARTICLE{Lai06therelay-eavesdropper,
author = {Lifeng Lai and Hesham El Gamal},
title = {The relay-eavesdropper channel: Cooperation for secrecy},
journal = {IEEE Trans. on Inf. Theory},
year = {2006}
}
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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. I.
Keyphrases
relay-eavesdropper channel user cooperation particular interest source message deaf helper phenomenon cooperation strategy secure wireless communication novel noise-forwarding several cooperation strategy secrecy capacity secure communication additive white gaussian noise transmitted message optimal rate-equivocation region relay node performance gain corresponding achievable rate-equivocation region four-terminal relay-eavesdropper channel classical setting
