Secure apps in the Fog: Anything to declare?

Assessing security of application deployments in the Fog is a non-trivial task, having to deal with highly heterogeneous infrastructures containing many resource-constrained devices. In this paper, we introduce: (i) a declarative way of specifying security capabilities of Fog infrastructures and security requirements of Fog applications, and (ii) a (probabilistic) reasoning strategy to determine application deployments and to quantitatively assess their security level, considering the trust degree of application operators in different Cloud/Fog providers. A lifelike example is used to showcase a first proof-of-concept implementation and to illustrate how it can be used in synergy with other predictive tools to optimise the deployment of Fog applications.