Trust Management in Fog/Edge Computing by means of Blockchain Technologies

Trust management is extremely important for sensor networks, and the emerging vision of the Internet of Things (IoT) does not represent an exception. In fact, it allows to realize a dynamic access control needed to cope with internal attacks conducted by compromised nodes, which are likely to occur in real world. However, trust management implies a considerable consumption of energy, due to the amount of messages exchanged to collect reputation scores. Consumption is further exacerbated by the means needed to protect from attacks the trust management entities themselves. This work proposes a suitable trust management for the IoT by exploiting the eventual consistency and security guarantees of blockchain. The design of a solution based on such a technology is described, and a qualitative assessment of its protection degree is provided.