What Is Intransitive Noninterference?
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چکیده
The term “intransitive noninterference” refers to the information flow properties required of systems like downgraders, 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.
منابع مشابه
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This paper argues that Haigh and Young’s definition of noninterference for intransitive security policies admits information flows that are not in accordance with the intuitions it seeks to formalise. Several alternative definitions are discussed, which are shown to be equivalent to the classical definition of noninterference with respect to transitive policies. Rushby’s unwinding conditions fo...
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This paper argues that Haigh and Young’s definition of noninterference for intransitive security policies admits information flows that are not in accordance with the intuitions it seeks to formalise. Several alternative definitions are discussed, which are shown to be equivalent to the classical definition of noninterference with respect to transitive policies. Rushby’s unwinding conditions fo...
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Noninterference is a notion of information flow security, originally defined for transitive information flow policies. A number of different definitions of noninterference have been proposed for intransitive policies. These definitions are stated with respect to several different semantic models, including state machines with observations on states, state machines with outputs associated to act...
متن کاملUnwinding Conditional Noninterference
Noninterference provides a control over information flow in a system for ensuring confidentiality and integrity properties. In the literature this notion has been well studied as transitive noninterference and intransitive noninterference. In this paper we define a framework on the notion of conditional noninterference, which allows to specify information flow policies based on the semantics of...
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تاریخ انتشار 1999