Abstract: The Internet of Things has changed device interaction and communication faces and brought an equally great challenge in security. Traditional models of centralized security cannot work in decentralized and expansive IoT networks; hence, they leave open several cyber threats. This paper proposes a blockchain-based approach for securing IoT through decentralized communication. The data integrity, authentication, and resistance to tampering are guaranteed through blockchain technology; at the same time, smart contracts enable the automation of safety policies. We demonstrate that this model enhances security without sacrificing performance by simulation and real-world testing.

Keywords: IoT security, Blockchain, Decentralized communication, Network security, Cybersecurity

Downloads: | DOI: 10.17148/IJIREEICE.2025.13205