Homomorphic Encryption for Privacy-Preserving Data Sharing with IOTA and IPFS in IoT-Based Medical Cyber-Physical Systems

The recent rise in cyber-attacks has jeopardized the protection and secrecy of data in medical cyber-physical systems (MCPS). Existing encryption methods prioritize system architecture over end-user concerns, necessitating innovative data management approaches. In this article, we develop a decentralized patient health data-sharing system using IOTA tangle and inter-planetary file system (IPFS) technologies. Our method employs Brakerski/Fan-Vercauteren (BFV) homomorphic encryption and fragmentation and dispersion techniques to store and share data securely. This ensures data privacy even if the transmission media and cryptographic keys are compromised. Emphasizing a patient-centric approach, our design places data protection on the end user's trusted device, like a smartphone, granting users control over data access and sharing, thus bolstering overall MCPS security.