Secure Searchable Encryption Based on Local Differential Privacy

In the cloud server, ranked searchable encryption allows the cloud server to search for the first k most relevant documents based on the correlation scores between the query keyword and the document. OPE (Orderpreserving encryption) is a widely used technique in sorted searchable encryption to protect privacy. However, recent studies have revealed potential privacy vulnerabilities in OPE schemes. To address this issue, our research paper proposes a novel approach called DP-SSE (Differential Privacy-based Ranked Searchable Encryption). By incorporating differential privacy into ranked searchable encryption, our proposed approach offers a more robust and secure solution to privacy preservation, mitigating the potential privacy leakage associated with traditional OPEbased techniques. Finally, the security proof, efficiency and accuracy analysis show that the scheme is feasible.