Security in the Internet of Things: Recent Challenges and Solutions Hamza Belkhiri, Abderraouf Messai, Mohamed Belaoued, and Farhi Haider Abstract Internet of things (IoT) is one of the technological revolutions of the new computing technology era, and is considered as the Web 3.0, in which billions of smart devices are interconnected. Although these connected objects offer many advantages, they are a critical risk in terms of security and privacy. In this paper, we present a review of the most recent threats and attacks targeting the IoT as well as the most relevant existing solutions that deal with these threats. Moreover, we provide an evaluation of these solutions with regards to IoT’s future trends. Finally, we provide our recommendations to insure a high security level against the different threats targeting IoT devices. Keywords Internet of Thing · IoT · IoT security · DoS/DDoS attack · WSN · IoT malware 1 Introduction The connection of a group of objects and devices of various kinds through the Internet network constitutes the so-called Internet of things [1]. This term was introduced in 1999 Kevin Ashton [2]. The company Cisco systems estimated that in April 2014, there were about 12.1 billion of devices connected to the Internet, indicating that the H. Belkhiri · A. Messai · F. Haider (B ) Department of Electronics, University Freres Mentouri Constantine 1, Constantine, Algeria e-mail: h_ferhi@yahoo.fr H. Belkhiri e-mail: hamzabelkhiri01@gmail.com A. Messai e-mail: r_messai@yahoo.fr M. Belaoued Lire Laboratory Software Technologies and Information Systems Department, University of Constantine 2, Constantine, Algeria e-mail: belaoued.mohamed@gmail.com © Springer Nature Singapore Pte Ltd. 2021 S. Bououden et al. (eds.), Proceedings of the 4th International Conference on Electrical Engineering and Control Applications, Lecture Notes in Electrical Engineering 682, https://doi.org/10.1007/978-981-15-6403-1_79 1133