Reinforcing Health Record Access Control Systems Leveraging Blockchain for Role-Based Security
M. Naveena · International Journal for Research in Applied Science and Engineering Technology · 2025
Cloud computing provides efficient data storage and sharing with low-cost resource utilization, but security issues are still a major challenge, especially data confidentiality and access control. Conventional approaches depend on encrypting data prior to uploading it to the cloud, but dynamic group management and secure key distribution are still challenging problems. To overcome these issues, this study suggests a secure and decentralized data-sharing model using blockchain technology and RoleBased Access Control (RBAC) combined with Elliptic Curve Cryptography (ECC). The system supports effective key management so that encrypted data can be accessed by authorized users only without any direct intervention of the data owner. Hybrid cloud model is implemented, where sensitive role structures and user mappings are kept in a private cloud and encrypted data is handled in a public cloud, for better security and scalability. The suggested method guarantees smooth revocation of group members by updating group keys automatically without re-encrypting the initial data, thus eliminating unauthorized access. Blockchain technology is also utilized to offer tamper evidence and solve issues of data modification. This new combination of blockchain, ECC encryption, and RBAC provides strong data privacy, secure key distribution, and effective rolebased access, and hence is a very secure and scalable solution for cloud-based data sharing.