Enhancing Cloud IoT Security With Blockchain and SDN

In the fast changing world of cloud based internet of things (IoT) eco-systems, secure connectivity between devices and cloud services is vital. On the other hand, the rising Man-in-the- Middle (MitM) attacks present serious threats to data integrity and confidentiality. In this regard, through a combination of Software Defined Networking (SDN) and Blockchain technology, this study proposes an innovative technique for improving security architecture in cloud IoT settings against MitM attacks. The solution put forward relies on blockchain to provide immutable transactions that are used as tamper-proof ledgers for device authentication and secure data sharing. Smart contracts create unchangeable transactions that also maintain the anonymity of devices and their communication processes. Additionally, SDN technology segments traffic, implements dynamic network policies, and therefore reduces MitM attack vectors through traffic inspection and access control. The testing process has shown that the approach effectively prevents MitM attacks while ensuring safe communication channels in cloud-based IoT systems. This implementation demonstrates improved data integrity, confidentiality, and security against unwanted intrusion attempts. This research paper contributes to the development of the cloud-based IoT security paradigm and highlights the synergistic potential of Blockchain and SDN in dealing with common security issues and improving the trustworthiness of networked devices for the Internet of Things.