Privacy-Preserving Healthcare Cloud Access Control: Registered Attribute-Based Encryption With Auditable Policy Updating

This research proposes a new encryption method called registered attribute-based encryption (RABE, a cryptographic technique that controls who can access data based on their attributes rather than fixed keys) to protect electronic health records (medical data stored in the cloud) from privacy and security risks. The proposed system addresses key problems with existing RABE approaches by allowing permission changes without constantly re-encrypting data and by reducing the computational work required on users' devices to decrypt information.