Directed information and the NRL network pump

Siva K. Gorantla, Sachin Kadloor, Todd P. Coleman, Negar Kiyavash, Ira S. Moskowitz, Myong H. Kang

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

Abstract

The NRL Network Pump®, or Pump, is a standard for mitigating covert channels that arise in a multi-level secure (MLS) system when a high user (HU) sends acknowledgements to a low user (LU). The issue here is that HU can encode information in the "timings" of the acknowledgements. The Pump aims at mitigating the covert timing channel by introducing buffering between HU and LU, as well as adding noise to the acknowledgment timings. Here, for the first time, we model the workings of the Pump in certain situations, as a communication system with feedback and use then this novel perspective to derive a upper bound on the rate of the covert channel between HU and LU in the Pump, in specific situations. This upper bound is presented in terms of a directed information flow over the dynamics of the system.

Original languageEnglish (US)
Title of host publicationISITA/ISSSTA 2010 - 2010 International Symposium on Information Theory and Its Applications
Pages343-348
Number of pages6
DOIs
StatePublished - Dec 1 2010
Event2010 20th International Symposium on Information Theory and Its Applications, ISITA 2010 and the 2010 20th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2010 - Taichung, Taiwan, Province of China
Duration: Oct 17 2010Oct 20 2010

Publication series

NameISITA/ISSSTA 2010 - 2010 International Symposium on Information Theory and Its Applications

Other

Other2010 20th International Symposium on Information Theory and Its Applications, ISITA 2010 and the 2010 20th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2010
CountryTaiwan, Province of China
CityTaichung
Period10/17/1010/20/10

ASJC Scopus subject areas

  • Computational Theory and Mathematics
  • Information Systems

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