A Reputation Model for Third-Party Service Providers in Fog as a Service

Fog computing, as a mode of distributing computing resources, can process data directly at the network edge so becomes a promising solution towards the Internet of Things (IoT). To support various IoT services, many third-party fog resources providers participate in the service provisioning process, which accelerates the development of Fog as a Service (FaaS). Current solutions assume the existence of a reliable entity to maintain run-time information about such third-party fog resources providers, which is not feasible because of resource constraints at the network edge. To be aware of the dynamic availability of the fog resources, this paper proposes a graph-based decentralized reputation model for service provisioning in fog computing environment. This mechanism includes a verification model between fog nodes and a consensus mechanism for composite transactions in FaaS. This paper evaluates the proposed solution and proves its feasibility through the experimental result.