Abstract
Internet of things is the fast developing network between different day-to-day products or things connected together via Internet. Internet of Things (IoT) has enabled connectivity of millions of devices together and help operate them at ease. The most important factor that needs to be taken into consideration while performing connectivity between devices over IoT is the IPbased communication protocols. Rapid growth in IoT increases security vulnerabilities of the linked objects. Internet Engineering Task Force (IETF) has standardized a communication protocol at application layer, that is developed in consideration with IoT, named Constrained Application Protocol (CoAP). Ensuring security over CoAP is an ongoing challenge and a major research area. CoAP is associated with various security schemes that guarantee secure data transfer and reliability over the network, but each of them still lack in providing full efficiency. This survey aims to analyze different security schemes implied to CoAP inorder to improve its performance and also states issues present in them. We examine different techniques that are aligned with CoAP to ensure fundamental security requirement and protect communication and some research challenges.
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