Secure information flow as a safety problem

  • Authors:
  • Tachio Terauchi;Alex Aiken

  • Affiliations:
  • EECS Department, University of California, Berkeley;Computer Science Department, Stanford University

  • Venue:
  • SAS'05 Proceedings of the 12th international conference on Static Analysis
  • Year:
  • 2005

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Abstract

The termination insensitive secure information flow problem can be reduced to solving a safety problem via a simple program transformation. Barthe, D'Argenio, and Rezk coined the term “self-composition” to describe this reduction. This paper generalizes the self-compositional approach with a form of information downgrading recently proposed by Li and Zdancewic. We also identify a problem with applying the self-compositional approach in practice, and we present a solution to this problem that makes use of more traditional type-based approaches. The result is a framework that combines the best of both worlds, i.e., better than traditional type-based approaches and better than the self-compositional approach.