Data Protection in IoT using CoAP based on Enhanced DTLS

The Internet of Things (IoT), refers to all the infrastructures and technologies put in place to operate various objects through an Internet connection, it is about connected objects. One of the most frequently used IoT application protocols is the Constrained Application Protocol (CoAP) that matches restricted computers. CoAP is a solution for in-regulated data formats and a high security to protect government-related data from cyber-attacks. CoAP advises using DTLS (Datagram Transport Layer Security) to provide robust security of the UDP-based TLS edition. Initially, DTLS was planned for conventional networks. Therefore, a heavyweight solution is created by moving the protocols over the resource-limited computers. Unfortunately, DTLS has some security issues regarding the management of keys and its vulnerability against common cyber-attacks especially Denial of Service (DoS). Thus, a security approach is important to secure CoAP-based IoT infrastructures from these attacks. In our work, we propose to secure IoT data using enhanced DTLS protocol over CoAP. The enhancement DTLS make it possible to prevent DoS and Distributed DoS attacks. In our proposition, we apply a thrusted party (TP) to which we delegate the process of the authentication and authorization of clients. In addition, the TP is responsible of the verification of IP addresses in order to mitigate attackers from flooding the network with fake hello messages.