关键词: 雾计算, 基于密文策略属性加密（CP-ABE）, 计算外包, 多授权机构

Abstract:

In fog computing, Ciphertext-Policy Attribute-Based Encryption（CP-ABE） technology is widely used to solve the problem of fine-grained access control of data. However, the encryption and decryption calculations bring a heavy burden on IoT devices with limited resources. This paper proposes an improved CP-ABE scheme based on multi-authority model, outsourcing part of the encryption and decryption computing from the IoT device to the nearby fog nodes, reducing the computing of the IoT device while achieving fine-grained access control of data. This scheme is suitable for actual IoT application scenarios. The efficiency and function of the proposed scheme are analyzed from both theoretical and experimental aspects. The analysis results show that the proposed scheme has higher system efficiency and practical value.

Key words: fog computing, Ciphertext-Policy Attribute-Based Encryption（CP-ABE）, computing outsourcing, multi-authority