关键词: 雾计算, 属性基加密, 多属性权威, 关键字搜索, 可追踪性和可撤销性

Abstract: This paper focuses on the limitations of traditional attribute-based keyword search schemes, such as inefficiencies in search algorithms, single-point performance bottlenecks, and the risk of malicious key leakage. A multi-authority encryption scheme with dynamic keyword search and user traceability is proposed for fog computing environments. Firstly, a dynamic search mechanism is introduced, allowing the search to stop once any keyword in the set matches, improving both flexibility and usability. Secondly, through the introduction of multiple attribute authorities to manage disjoint attribute sets, single-point bottlenecks are prevented, significantly enhancing scalability and system stability. Thirdly, in order to prevent malicious users from leaking keys, the user’s identity information is embedded in the key to track malicious users. After tracking malicious users, the user would be added to the revocation list, thereby canceling the user’s access rights. Finally, computational tasks are outsourced to fog nodes, reducing the computational burden on resource-constrained terminal users. Security analysis and performance comparisons show the proposed method is secure and efficient.

Key words: fog computing, attribute-based encryption, multi-authority, keyword search, traceability and revocation