Quantified Interference for a While Language

  • Authors:
  • David Clark;Sebastian Hunt;Pasquale Malacaria

  • Affiliations:
  • Department of Computer Science, King's College London, London, UK;Department of Computing, City University, London, UK;Department of Computer Science, Queen Mary College, University of London, London, UK

  • Venue:
  • Electronic Notes in Theoretical Computer Science (ENTCS)
  • Year:
  • 2005

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Abstract

We show how information theory can be used to give a quantitative definition of interference between variables in imperative programming languages. In this paper we focus on a particular case of this definition of interference: leakage of information from private variables to public ones in While language programs. The major result of the paper is a quantitative analysis for this language that employs a use-definition graph to calculate bounds on the leakage into each variable.