Interference assisted secret communication

Xiaojun Tang, Ruoheng Liu, Predrag Spasojević, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

147 Scopus citations


Wireless communication is susceptible to eavesdropping attacks because of its broadcast nature. This paper illustrates how interference can be used to counter eavesdropping and assist secrecy. In particular, a wiretap channel with a helping interferer (WT-HI) is considered. Here, a transmitter sends a confidential message to its intended receiver in the presence of a passive eavesdropper and with the help of an independent interferer. The interferer, which does not know the confidential message, helps in ensuring the secrecy of the message by sending an independent signal. An achievable secrecy rate and several computable outer bounds on the secrecy capacity of the WT-HI are given for both discrete memoryless and Gaussian channels.

Original languageEnglish (US)
Article number5752448
Pages (from-to)3153-3167
Number of pages15
JournalIEEE Transactions on Information Theory
Issue number5
StatePublished - May 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


  • Eavesdropping
  • information-theoretic secrecy
  • interference
  • interference channel
  • wiretap channel


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