Abstract
This paper presents λ I , a language for dynamic tracking of information flow across multiple, interdependent dimensions of information. Typical dimensions of interest are integrity and confidentiality. λ I supports arbitrary domain-specific policies that can be developed independently. ?I treats information-flow metadata as a first-class entity and tracks information flow on the metadata itself (integrity on integrity, integrity on confidentiality, etc.). This paper also introduces IMPOLITE, a novel class of information-flow policies for λ I . Unlike many systems, which only allow for absolute-security relations, IMPOLITE can model more realistic security policies based on relative-security relations. IMPOLITE demonstrates how policies on interdependent dimensions of information can be simultaneously enforced within λ I 's unified framework.
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