A Blockchain-Based Lightweight Secure Authentication and Trust Assessment Framework for IoT Devices in Fog Computing

The IoT devices are used in everyday life and are connected to build a network. An extensive amount of data is being shared among these devices. However, these devices are resource-constrained and cannot perform their computations. Assuring the confidentiality and safety of IoT devices has become a significant worry due to their limited resources. As a result, the concept of fog computing, which performs computation on behalf of IoT devices, was introduced. The fog computing paradigm provides a distributed resource environment close to the smart IoT devices. In this paper, we used Blockchain Technology and Iterative Filtering (IF) Algorithm to ensure data privacy as well as prevent collusion attacks. Elliptic Curve Cryptography (ECC)-based authentication mechanism is employed to offer effective security during device-to-device communication. In addition, an angular distance-based secure cluster of IoT devices is establish using a secure and reliable trust mechanism where before entering the cluster, each IoT device needs to authenticate itself, and this cluster allows devices to communicate securely and without interruption. The experiment findings demonstrate the effectiveness of our proposed design in preventing collusion attacks. Furthermore, the model we propose is more efficient in terms of energy consumption and time complexity.