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Due to the large number of IoT devices available, data needed to be processed by cloud service providers has grown exponentially. This leads to increase in the latency of cloud services and by extension latency in many IoT applications. To reduce this latency, computing devices are installed at the edge of the network close to the user. These devices are called “Fog Nodes”. They allow the user to process some data without going all the way to the data center. While the data centers are equipped with abundant resources (i.e. processors, energy and memory), the fog devices are not. This means traditional techniques for preventing intrusion are not applicable at the fog level, because they will incur more latency and/or energy consumption. Therefore, there is a need for low resource demanding, yet strong security system that will protect the fog layer from being attacked. This paper proposes an Intrusion Detection …