A unified framework for key agreement over wireless fading channels

Lifeng Lai, Yingbin Liang, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

85 Scopus citations


The problem of key generation over wireless fading channels is investigated. First, a joint source-channel approach that combines existing source and channel models for key agreement over wireless fading channels is developed. It is shown that, in general, to fully exploit the resources provided by time-varying channel gains, one needs to combine both the channel model, in which Alice sends a key to Bob over a wireless channel, and the source model, in which Alice and Bob generate a key by exploiting the correlated observations obtained from the wireless fading channel. Asymptotic analyses suggest that in the long coherence time regime, the channel model is asymptotically optimal. On the other hand, in the high power regime, the source model is asymptotically optimal. Second, the framework is extended to the scenario with an active attacker. Assuming that the goal of the attacker is to minimize the key rate that can be generated using the proposed protocol and the attacker will employ such an attack strategy, the attacker's optimal attack strategy is identified and the key rate under this attack model is characterized.

Original languageEnglish (US)
Article number6109346
Pages (from-to)480-490
Number of pages11
JournalIEEE Transactions on Information Forensics and Security
Issue number2
StatePublished - Apr 2012


  • Active security attack
  • information theoretic security
  • key generation
  • key rate
  • optimal attack strategy

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Computer Networks and Communications


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