Device Authentication and Secure Routing in MANET for Internet of Things Kirubadevi Thiyagarajan a,1 , Ramamoorthy S b , Neelavathy Pari S c and Rajakumar P S d a Dept of CSE, Dr.M.G.R Educational and Research Institute, Chennai b Professor, Dr.M.G.R Educational and Research Institute, Chennai c Assistant Professor, Dept of CSE, Madras Institute of Technology, Chennai d Professor, dept of CSE, Dr.M.G.R Educational and Research Institute ,Chennai Abstract. In the next generation of communication mobile adhoc network (MANET) will play a major role in Internet of Things (IoT).MANET can be defined as a network among a group of nodes with no infrastructure. Internet of Things is the composition of a variety of networks like Wi-Fi, ZigBee, Wireless Sensor Networks (WSNs).MANETs, and Radio Frequency Identifier (RFID). There is a need for the compatibility of MANET with IoT for the deployment of smart infrastructure. Authenticity and security in communication between devices are essential for the realization of IoT with MANET. Authentication and providing security in MANET are always challenging due to its mobility in nature. Devices in IoT are usually resource constrained in energy, memory, computation and bandwidth. Therefore, it is difficult for each node to authenticate all the devices in the network. In this paper, an authentication scheme is proposed without any third party provider to distinguish the authorized and unauthorized devices. This authentication consists of two level process; in the 1st level mutual devices are authenticated, and in the 2 nd level secure data routing between the devices is carried out. Mutual authentication is performed by Clustering based on keys and unique identities and by the cluster heads interpreting for secure routing. This scheme ensures the early measure of authenticity for the message requested enters into the IoT networks and disagreement against attacks. Keywords:IoT, MANET, Clustering, cluster head, consistency, malicious device, Authentication, Secure routing. 1. Introduction The Internet of Things(IoT) is the association of different devices (both physical and logical) like vehicles, automation objects, embedded software, sensors, connectivity and actuators. MANET is a dispersed group of wireless nodes that can work without the existence of stable network infrastructure. In this network, the nodes are open to travel erratically at any specified time. The movement of nodes determines network topology and interconnections among the nodes can transform quickly randomly. Therefore, nodes need to be coordinated for multi-hop interactions. Security is a major concern in MANET. Because of its uncovered connectivity, resource restrictions, without bounded physical guard of the mobile nodes [1]. Thus, MANETs are more inclined to security threats. Authentication plays an important role in security of the network. Currently, there are many existing secure 1 Kirubadevi Thiyagarajan, Dept of CSE, Dr. M.G.R Educational and Research Institute, Chennai; Email id: kirubadevi.t@drmgrdu.ac.in Intelligent Systems and Computer Technology D.J. Hemanth et al. (Eds.) © 2020 The authors and IOS Press. This article is published online with Open Access by IOS Press and distributed under the terms of the Creative Commons Attribution Non-Commercial License 4.0 (CC BY-NC 4.0). doi:10.3233/APC200159 313