Key (lock)

Aggregate (composite)

Self-certifying File System

Operating system

The Internet

World Wide Web

Political science

Encryption

Composite material

Materials science

Insider

Cloud storage

File system

Computer science

Cloud computing

SSH File Transfer Protocol

Computer security

Database

IEEE Transactions on Industrial Informatics

Cloud storage has been used to reduce the cost and support convenient collaborations for industrial Internet of things (IIoT) data management. When data owners share IIoT data with authorized parties for data interaction, secure cloud data searching and file access control are fundamental security requirements. In this paper, first we discuss a new insider attack to the Cui's multi-key aggregate searchable encryption scheme, where the unauthorized inside users can guess the other users private keys. Then, we propose a novel file-centric multi-key aggregate keyword searchable encryption (Fc-MKA-KSE) system for the IIoT data in the file-centric framework. Specifically, we present two formal security models, namely, the security models of the indistinguishable selective-file chosen keyword attack and the indistinguishable selective-file keyword guessing attack, which can satisfy the security requirements. Our experimental results show that the proposed scheme achieves computational efficiency.

File-Centric Multi-Key Aggregate Keyword Searchable Encryption for Industrial Internet of Things