Abstract
The security checker (SC for short) is a semantic tool for the automatic verification of some information flow properties. The specifications given as inputs to SC are terms of the security process algebra (SPA for short), a language suited for the specification of systems where actions belong to two different levels of confidentiality. The information flow security properties which can be verified by SC are some of those classified in previous papers. They are derivations of some classic notions, e.g. non interference. The tool is based on the same architecture of the concurrency workbench, from which some modules have been integrally imported. The usefulness of the tool is tested with the significative case-study of an access monitor.
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