Blockchain for IoT security: securing firmware updates and device authentication

Abstract

The rapid growth of IoT devices has increased security risks, particularly in firmware updates and device authentication. Traditional approaches are vulnerable to attacks such as unauthorised access and data breaches. This study proposes a blockchain-based framework using smart contracts and a proof-of-authority (PoA) consensus mechanism to ensure secure firmware verification and decentralised authentication. The system leverages distributed ledger technology to enhance integrity, trust, and scalability in IoT environments. Experimental results demonstrate reduced latency, improved throughput, and strong resistance to common cyber threats, making the framework suitable for large-scale IoT deployments.