Trust-Driven Policy Enforcement through Gate Automata

In this paper we introduce the notion of gate au-tomata for describing security policies. This new kind ofautomata aim at defining a model for the specification of bothsecurity and trust policies.The main novelty of our proposal is a unified framework forthe integration of security enforcement and trust monitoring.Indeed, gate automata watch the execution of a target program,possibly modifying its behaviour, and produce a feedback forthe trust management system. The level of trust changes theenvironment settings by dynamically activating/deactivatingsome of the defined gate automata.