A lattice-based fine-grained multi-keyword searchable encryption scheme for medical data sharing with user revocation and selective disclosure

This academic paper describes a new encryption method designed to let multiple people search through encrypted medical data while protecting privacy and controlling who has access. The scheme uses lattice-based cryptography (a type of math-hard encryption based on complex grid structures) and allows for selective disclosure (sharing only certain information with specific people) and user revocation (removing someone's access rights). This addresses the challenge of keeping medical information secure while still making it searchable and shareable in healthcare systems.