A secured decentralized IoT network with block chain: ensuring trust and data integrity

Abstract

The fast spurts of Internet of Things (IoT) devices have brought new challenges in security and privacy, such as data breaches, unauthorized access, and vulnerability of centralized systems. Traditional IoT security models are based on the centralized architectures and, therefore, have a lack of redundancy and a vulnerability to cyber-attacks. This paper introduces a secured decentralized IoT network based on blockchain technology to improve trust, integrity of data, and security in IoT ecosystem. The distributed ledger technology (DLT) of blockchain makes data transactions tamper-proof, access control transparent and based on decentralized authentication. By integrating smart contracts, the system automates secure device-to-device communication without intermediaries, reducing latency and improving efficiency. The proposed approach eliminates data silos, enhances network resilience, and mitigates security threats such as data manipulation, DDoS attacks, and unauthorized access. Performance analysis demonstrates that blockchain-based IoT security significantly improves data integrity, transaction transparency, and system reliability, making it an ideal solution for smart cities, healthcare, and industrial IoT applications.