A Blockchain-Based Normalized Searchable Encryption System for Medical Data

As COVID-19 continues to spread around the world, healthcare industry has accelerated transformation digital services. In era of big data, many hospitals prefer use remote cloud servers store and manage massive electronic medical data. However, cloud-assisted data systems cannot guarantee confidentiality, integrity, availability Searchable encryption can effectively address above challenges by enabling search on ciphertext, which achieves while ensuring security privacy. server may return mismatched results due economic interests or single points failure. Blockchain is a decentralized computing paradigm with public verifiability, provides an efficient solution this problem. existing blockchain-based searchable solutions do not consider flexible function multiple users restriction encrypted for scenarios. Therefore, we propose multiuser normalized (BNSE) scheme design system (BNSEM) based scheme. To verify practicality system, evaluate performance from both theoretical experimental aspects.