Mitigating DoS attacks in IoT EDGE Layer to preserve QoS topics and nodes' energy

Numerous challenges prevent the securing of IoT devices and their end-to-end communication in an IoT environment. The IoT is currently widely used in many areas such as in smart cities, in advanced logistic systems, in smart home etc. The safety and security of such systems are key aspects to guarantee the quality of their services. The purpose of this work is to model and evaluate a new IoT security system in a fog/edge network where there are lightweight nodes exchanging messages through the Message Queue Telemetry Transport (MQTT) protocol. This work aims to increase the security of this protocol at the application level, particularly mitigating data tampering and eavesdropping by using Elliptic Curve Cryptography (ECC), and applying different security mechanisms to the data topics. This feature allows to apply a threshold-based packet discarding policy for preserving the Quality of Service (QoS) of MQTT topics.