What is Intransitive Noninterference?

  • Authors:
  • A. W. Roscoe;M. H. Goldsmith

  • Affiliations:
  • -;-

  • Venue:
  • CSFW '99 Proceedings of the 12th IEEE workshop on Computer Security Foundations
  • Year:
  • 1999

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Abstract

The term "intransitive noninterference" refers to the information flow properties required of systems like down-graders, in which it may be legitimate for information to flow indirectly between two users but not directly. We examine the usual definition of this property in terms of a modified purge function, and show that this is a distinctly weaker property than an alternative we derive from considerations of determinism.