Abstract
Cloud-assisted smart grid has been broadly deployed to improve the economics, efficiency, sustainability, and reliability of electricity services. The new revolution of technology will also bring new challenges to data security, particularly data confidentiality. As a promising encryption method for supporting fine-grained access control, attribute-based encryption (ABE) is widely given attention by the academia and industry. However, most existing schemes suffer from the efficiency problem limiting its deployment for the cloud-assisted smart grid, especially for resource-limited users. To address this problem, this paper proposes two efficient pairing-free ciphertext-policy attribute-based schemes that eliminate the computation-intensive bilinear pairing operation. The basic scheme only uses some simple scalar multiplications based on elliptic curves, and the enhanced scheme provides an important usability feature, namely the users and attributes revocation. The security of the proposed schemes is reduced to the elliptic curve decisional Diffie-Hellman problem. Finally, the performance analysis and extensive experiments demonstrate that our proposed schemes are suitable for the cloud-assisted smart grid.
Highlights
Smart grid as the next-generation power supply network has been broadly adopted to address the problems of the traditional power grid
To address the above problems, we propose two efficient and secure ciphertext-policy attribute-based encryption schemes without pairing for cloud-assisted smart grid
The basic scheme is a pairing-free ciphertext-policy attribute-based encryption which is complementary to key-policy attribute-based encryption (KP-ABE) in the application scenarios, and the enhanced scheme supports the users and attributes revocation without increasing computational overhead
Summary
Y. Wang et al.: Efficient and Secure CP-ABE Encryption Without Pairing for Cloud-Assisted Smart Grid. MOTIVATIONS AND CONTRIBUTIONS Currently, a few works [7]–[9] have been focused on designing lightweight attribute-based encryption schemes They still have some drawbacks as follows: 1) These solutions have limited application scenarios. Most existing lightweight schemes [7], [10] are key-policy attribute-based encryption (KP-ABE), which is only suitable for users with fixed access rights. To address the above problems, we propose two efficient and secure ciphertext-policy attribute-based encryption schemes without pairing for cloud-assisted smart grid. The basic scheme is a pairing-free ciphertext-policy attribute-based encryption which is complementary to KP-ABE in the application scenarios, and the enhanced scheme supports the users and attributes revocation without increasing computational overhead.
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