Cooperative encoding for secrecy in interference channels

Onur Ozan Koyluoglu, Hesham El Gamal

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


This paper investigates the fundamental performance limits of the two-user interference channel in the presence of an external eavesdropper. In this setting, we construct an inner bound, to the secrecy capacity region, based on the idea of cooperative encoding in which the two users cooperatively design their randomized codebooks and jointly optimize their channel prefixing distributions. Our achievability scheme also utilizes message-splitting in order to allow for partial decoding of the interference at the nonintended receiver. Outer bounds are then derived and used to establish the optimality of the proposed scheme in certain cases. In the Gaussian case, the previously proposed cooperative jamming and noise-forwarding techniques are shown to be special cases of our proposed approach. Overall, our results provide structural insights on how the interference can be exploited to increase the secrecy capacity of wireless networks.

Original languageEnglish (US)
Article number6006610
Pages (from-to)5682-5694
Number of pages13
JournalIEEE Transactions on Information Theory
Issue number9
StatePublished - Sep 2011


  • Cooperative encoding
  • information theoretic security
  • interference channel

ASJC Scopus subject areas

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences


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