Multi-keyword Searchable Encryption Scheme with Data User Traceability and Revocation

Searchable encryption is an essential technique to achieve data security and availability in cloud computing.Attribute-based searchable encryption (ABSE) achieves fine-grained access control of data while completing keyword retrieval.However, most ABSE schemes ignore the privacy leakage hazards caused by the malicious data users (DUs).DUs leak the decryption key, which allows unauthorized users to access plaintext, resulting in file privacy leakage.And unauthorized DUs use the decryption key leaked by the malicious DUs to complete trapdoor construction and achieve search operations, resulting in the leakage of keyword information of files.To address these issues, we propose a multi-keyword searchable encryption scheme that supports the tracking and revocation of malicious DUs.Specifically, white-box tracking technology is used to achieve malicious DU tracking, and a revocation mechanism is established to revoke malicious DU.At the same time, it fully combines the advantages of multi-keyword search to save computation overhead, and achieves more efficient and reliable searchable encryption.We demonstrate that the scheme achieves trapdoor unforgeability and traceability, and perform performance analysis to show the practicality of the proposed scheme.