Medical Internet of Things Technology

With rapid advancements in the technology almost all the devices around are becoming smart and contribute to the Internet of Things (IoT) network. When a new IoT device is added to the network it is important to verify the authenticity of the device before allowing it to communicate with the network. Hence access control is a crucial security mechanism that allows only the authenticated node to become the part of the network. An access control mechanism also supports confidentiality by establishing a session key that accomplishes secure communications in open public channels. Recently blockchain has been implemented in access control protocols to provide a better security mechanism. The foundation of this survey article is laid on IoT where a detailed description on IoT its architecture and applications is provided. Further various security challenges and issues security attacks possible in IoT and their countermeasures are also provided. We emphasize on the blockchain technology and its evolution in IoT. A detailed description on existing consensus mechanisms and how blockchain can be used to overpower IoT vulnerabilities is highlighted.