Blockchain-based IoT security and performance analysis

The Internet of Things (IoT) refers to a network structure that enables various devices to connect to each other and exchange data. The adoption of this technology has led to improvements in many areas, from industrial processes to daily life activities. However, the rapid increase in the number of IoT devices brings with it significant security challenges. In particular, cyber-attacks, data breaches and unauthorized access have become the main threats to the security of IoT systems. This thesis examines the combination of blockchain technology with the goal of improving IoT security and evaluates the advantages of Hyperledger Fabric in this context. Blockchain technology can make great contributions to IoT systems, especially with its permissioned network structure and decentralization features. Blockchain enables secure storage of data and increases data integrity and confidentiality. Hyperledger Fabric offers an ideal platform to meet these security requirements and provides flexibility to organizations thanks to its modular architecture. With the OPNET simulation tool, the performance of the IoT network that transmits packets encrypted using blockchain is analyzed in detail. The simulations show how the incorporation of blockchain technology into IoT systems can increase security levels and provide protection against cyber threats. Furthermore, this study examines the potential of systems that transmit packets encrypted using blockchain to prevent unauthorized access by securing users' authentication processes. In conclusion, this thesis demonstrates the potential of blockchain technology to secure IoT and provides practical solutions for industrial applications. By presenting findings that blockchain will play an important role in securing IoT systems in the future, it emphasizes the need for further research in this field. This study aims to both contribute to the academic literature and provide a foundation for practical applications. This approach to IoT security will have an important place not only in technology development but also in industrial applications.