PRIVACY-PRESERVING EHR MANAGEMENT USING PROXY RE-ENCRYPTION AND ATTRIBUTE-BASED ACCESS CONTROL

Abstract

Since traditional encryption techniques have scalability and usability issues, the growing use of cloud-based electronic health record (EHR) systems poses serious privacy and security challenges due to data breaches and unauthorized access, calling for a more reliable, effective, and privacy-preserving solution. In order to improve privacy, access control, and transparency, this project will integrate Proxy Re-Encryption (PRE), Attribute-Based Encryption (ABE), and Blockchain technology to create a scalable and secure EHR administration system. The suggested system uses blockchain for immutable access logging, ABE for fine-grained policy- driven encryption, and PRE for dynamic access delegation. This ensures safe data sharing without disclosing private keys and keeps transparent and impenetrable access records. With improvements in scalability of 86.4%, data integrity of 99.6%, and access control efficiency of 91.2%, performance evaluation shows higher efficiency over current models. In contrast to earlier studies such as Health chain (83.4%) and Ming & Zhang's ABSC (78.5% efficiency), our model greatly improves security while lowering computational overhead. The integrated  method provides a patient-centered, scalable, and privacy-preserving EHR management system appropriate for contemporary cloud-based healthcare settings.