An Integrated Privacy Preservation and Blockchain Mode for Secured Data Transmission in Medical Applications

Abstract Keeping medical data safe and private has become a big challenge with the fast-growing digital healthcare systems. Old security methods are not strong enough to stop hacking and unauthorized access. This paper introduces an Integrated Privacy Preservation and Blockchain (IPPB) model to make medical data sharing secure. The model uses blockchain to create a decentralized and unchangeable record that ensures data accuracy, precise tracking, and controlled access. It also applies strong encryption methods like homomorphic encryption and zero-knowledge proofs (ZKP) to protect patient information while allowing safe data sharing between healthcare providers. A lightweight approval method is used to make the system faster, which lowers the usual heavy processing of blockchain networks, making it better for real-time medical use. An intelligent contract- based access system ensures that only allowed users can see the data while keeping track of who accessed it. Tests show that the IPPB model works better than current security methods by improving speed, maintaining private data, and defending against cyber threats. The results prove that adding blockchain to privacy systems can make medical data more secure, trustworthy, and easy to share, making it useful for future healthcare systems. Keywords: Privacy Preservation, Blockchain, Medical Data Security, Homomorphic Encryption, Smart Contracts, Secure Data Transmission, Cybersecurity in Healthcare.