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Scaling laws for secrecy capacity in cooperative wireless networks
KTH, School of Electrical Engineering (EES), Communication Networks. (Networked Systems Security)
KTH, School of Electrical Engineering (EES), Communication Networks. (Networked Systems Security)
2014 (English)In: INFOCOM, 2014 Proceedings IEEE, 2014, 1527-1535 p.Conference paper (Refereed)
##### Abstract [en]

We investigate large wireless networks subject to security constraints. In contrast to point-to-point, interference-limited communications considered in prior works, we propose active cooperative relaying based schemes. We consider a network with $n_l$ legitimate nodes, $n_e$ eavesdroppers, and path loss exponent $\alpha\geq 2$. As long as $n_e^2(\log(n_e))^{\gamma}=o(n_l)$, for some positive $\gamma$, we show one can obtain unbounded secure aggregate rate. This means zero-cost secure communication, given fixed total power constraint for the entire network. We achieve this result through (i) the source using Wyner randomized encoder and a serial (multi-stage) block Markov scheme, to cooperate with the relays and (ii) the relays acting as a virtual multi-antenna to apply beamforming against the eavesdroppers. Our simpler parallel (two-stage) relaying scheme can achieve the same unbounded secure aggregate rate when $n_e^{\frac{\alpha}{2}+1}(\log(n_e))^{\gamma+\delta(\frac{\alpha}{2}+1)}=o(n_l)$ holds, for some positive $\gamma,\delta$.

##### Place, publisher, year, edition, pages
2014. 1527-1535 p.
##### Series
, Proceedings - IEEE INFOCOM, ISSN 0743-166X
##### Keyword [en]
Secrecy capacity, Scaling laws, Cooperative strategies, Relaying, Large wireless networks, Information-theoretic security
##### National Category
Communication Systems
##### Identifiers
ISI: 000361544200171ScopusID: 2-s2.0-84904411004ISBN: 9781479933600OAI: oai:DiVA.org:kth-137746DiVA: diva2:679718
##### Conference
33rd IEEE Conference on Computer Communications, IEEE INFOCOM 2014; Toronto, ON; Canada; 27 April 2014 through 2 May 2014
##### Note

QC 20150602

Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2015-10-29Bibliographically approved

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