Key generation with limited interaction

Jingbo Liu, Paul Cuff, Sergio Verdu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


The basic two-terminal key generation model is considered, where the communication between the terminals is limited. We introduce a preorder relation on the set of joint distributions called XY-absolute continuity, and we reduce the multi-letter characterization of the key-communication tradeoff to the evaluation of the XY-concave envelope of a functional. For small communication rates, the key bits per interaction bit is expressed with a 'symmetrical strong data processing constant'. Using hypercontractivity and Rényi divergence, we also prove a computationally friendly strong converse bound for the common randomness bits per interaction bit in terms of the supremum of the maximal correlation coefficient over a set of distributions, which is tight for binary symmetric sources. Regarding the other extreme case, a new characterization of the minimum interaction for achieving the maximum key rate (MIMK) is given, and is used to resolve a conjecture by Tyagi [1] about the MIMK for binary sources.

Original languageEnglish (US)
Title of host publicationProceedings - ISIT 2016; 2016 IEEE International Symposium on Information Theory
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)9781509018062
StatePublished - Aug 10 2016
Event2016 IEEE International Symposium on Information Theory, ISIT 2016 - Barcelona, Spain
Duration: Jul 10 2016Jul 15 2016

Publication series

NameIEEE International Symposium on Information Theory - Proceedings
ISSN (Print)2157-8095


Other2016 IEEE International Symposium on Information Theory, ISIT 2016

All Science Journal Classification (ASJC) codes

  • Theoretical Computer Science
  • Information Systems
  • Modeling and Simulation
  • Applied Mathematics


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