Matching Comes First: Efficient Certificateless Lattice-Based Bilateral Access Control With On-Demand Matching

This paper presents a new cryptographic method called certificateless lattice-based matchmaking encryption (CLLME) designed to secure data sharing on cloud platforms while meeting regulations like GDPR. CLLME provides post-quantum security (protection against future quantum computers), allows both senders and receivers to control who can access data, and includes a filtering mechanism to avoid decrypting irrelevant encrypted files. The researchers proved the method is mathematically secure and showed it works efficiently in real-world scenarios.