Authors - Vani K S, Nanditha B, R Bharadhwaj, Rishika Ghai Abstract - Internet of Things (IoT) applications have experienced fast development resulting in massive interconnectivity of devices, and IoT networks have become susceptible to security risks of Sybil, flooding, and masquerading attacks. Conventional centralized security schemes lack flagella, lack the dynamism of trust evaluation, and are vulnerable to single-point failures, whereas the current blockchain-based systems impose too much extra computational and energy load to be applicable in resource-constrained IoT applications. These issues underscore the necessity to have a lightweight, decentralized, and trust-conscious security system that can be used to guarantee secure IoT communication in adversarial environments. The paper presents a lightweight framework of blockchain-based trust that can be exploited to provide security to IoT communication against network-level attacks. The suggested architecture combines a decentralized blockchain architecture and dynamic trust assessment operation to distinguish trustful nodes and isolate bad actors. It uses a trust-sensitive Proof-of-Work (PoW) architecture to verify block authenticity, in which a node trust score is calculated following communication behavior and history of interaction. Technique of order of preference similarity to Ideal solution (TOPSIS) is used to choose the high trust nodes to validate the transaction securely, which minimizes the amount of computation wasted and increases the network reliability.
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