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Leading cloud computing providers, such as Amazon, Google, and Microsoft, use proprietary technologies to deliver their services. Users have a desire to use multiple providers to increase their service availability, reduce costs, not rely on a single provider, among other reasons. Authorization Policy Federations (APFs) allow the definition of a single access control policy that can be applied across multiple heterogeneous providers. To do this, these policies, described in Disjunctive Normal Form (DNF) and semantics defined by an ontology, must be mapped to the local context of each user and cloud. This paper discusses the syntactic and semantic mapping processes of policies and the Semantic Equivalence Level (LSE) metric used to measure their effectiveness.

Mapeamentos Sintático e Semântico em Federações de Políticas de Autorização para Nuvens Heterogêneas