Attribute-based keyword search across encrypted cloud data with multiple authorities

Abstract

Searchable Encryption (SE) is a crucial technique for cloud data security and usability (SE). When employing Ciphertext Policy Attribute-Based Encryption (CP-ABE) and the Ciphertext Policy Attribute-Based Keyword Search (CP-ABKS), encryption and access control may be done simultaneously. A single attribute authority is responsible for authenticating user certificates and delivering secret keys in current CP-ABKS systems. A single point of failure results in distributed cloud systems. To address these difficulties, we explain in this paper the MABKS system, which is designed to help cloud devices with limited computing and storage capabilities. The MABKS system has added capability for tracing and modifying malicious attribute authority. According to our detailed security investigation, the MABKS system is safe in both selective-matrix and selective-attribute models. Our trials using real-world datasets have shown the MABKS system's efficiency and usefulness.