[isabelle] New entry in the (moved!) AFP
Iâm pleased to announce a new AFP entry, by Pasquale Noce, on the conservation of CSP noninterference security under sequential composition. Abstract and other details below. Thank you, Pasquale!
And please note that the AFP has a new URL: http://www.isa-afp.org/
The AFP has moved from SourceForge because of a lot of issues there.
Conservation of CSP Noninterference Security under Sequential Composition
In his outstanding work on Communicating Sequential Processes, Hoare has defined two fundamental binary operations allowing to compose the input processes into another, typically more complex, process: sequential composition and concurrent composition. Particularly, the output of the former operation is a process that initially behaves like the first operand, and then like the second operand once the execution of the first one has terminated successfully, as long as it does. This paper formalizes Hoare's definition of sequential composition and proves, in the general case of a possibly intransitive policy, that CSP noninterference security is conserved under this operation, provided that successful termination cannot be affected by confidential events and cannot occur as an alternative to other events in the traces of the first operand. Both of these assumptions are shown, by means of counterexamples, to be necessary for the theorem to hold.
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