On Effects of Mobility Management Signalling Based DoS Attacks Against LTE Terminals Long Term Evolution (LTE) has become the most mature and stable mobile communication network technology worldwide so far. Billions of mobile subscribers are using LTE networks to surf the Internet, make phone calls, and send text messages every day. Meanwhile, Denialof Service (DoS) attacks seriously threaten the availability of LTE networks. In this paper, we focus on the research into the effects of reject signalling based DoS attacks against LTE terminals. We revealed a new DoS attack vulnerability in the authentication procedure after a detailed exploration in 3GPP standard specifications and verified it using software radio tools. Moreover, we specifically tested the impacts of such devicetargeted DoS attacks on users under different test conditions (e.g. different operators, chip vendors, etc and we classified the actual test results into 6 different impact levels to better evaluate the effects on subscribers. Several possible countermeasures are also discussed to defend the attacks.

Detection and Mitigation of DoS and DDoS Attacks in IoTBased Stateful SDN : An Experimental Approach The expected advent of the Internet of Things (IoT) has triggered a large demand of embedded devices, which envisions the autonomous interaction of sensors and actuators while offering all sort of smart services. However, these IoT devices are limited in computation, storage, and network capacity, which makes them easy to hack and compromise. To achieve secure development of IoT, it is necessary to engineer scalable security solutions optimized for the IoT ecosystem. To this end, Software Defined Networking (SDN) is a promising paradigm that serves as a pillar in the fifth generation of mobile systems (5G) that could help to detect and mitigate Denial of Service (DoS) and Distributed DoS (DDoS) threats. In this work, we propose to experimentally evaluate an entropybased solution to detect and mitigate DoS and DDoS attacks in IoT scenarios using a stateful SDN data plane. The obtained results demonstrate for the first time the effectiveness of this technique targeting real IoT data traffic.