A Hybrid Cryptography-Based Secure Data Exchange Algorithm for Blockchain-Enabled IoT Systems

The rapid development of Internet of Things (IoT) technologies has significantly increased the demand for secure and efficient communication mechanisms. However, traditional security approaches are often unsuitable for IoT environments due to limited computational resources and vulnerability to various cyberattacks. This paper proposes a secure data exchange algorithm based on blockchain technology and hybrid cryptography. The proposed method integrates an enhanced elliptic curve-based digital signature algorithm (EECHERI) with symmetric encryption (AES-192) to ensure authentication, confidentiality, and integrity. A cluster-based architecture is adopted to improve scalability and efficiency, while a dynamic session key generation mechanism enhances security. The communication protocol is designed in seven sequential steps, ensuring secure device-to-device interaction. The proposed approach provides strong resistance against spoofing, replay, and unauthorized access attacks while maintaining low computational overhead, making it suitable for real-world IoT applications.

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