Applying Generalized Non Deducibility on Compositions (GNDC) Approach in Dependability

This paper presents a framework where dependable systems can be uniformly modeled and dependable properties analyzed within the Generalized Non Deducibility on Compositions (GNDC ), a scheme that has been protably used in denition and analysis of security prop- erties. Precisely, our framework requires a systems to be modelled using a formal calculus, here the CCS process algebra, where both the failing behaviour of the system and the related fault-recovering procedures are also explicitly described. An environment able to inject any fault in the system is then dened as a separated component. The parallel compo- sition between the system and the environment represents our scenario of analysis, where some fault tolerance property (e.g., fail stop, safe and silent) are studied as instances of GNDC properties. By using dier- ent instances of GNDC we are able to argue about the availability of eectiv e methodologies of analysis, and on the possibility of applying compositional techniques.