Abstract
Searchable public key encryption enables a storage server to retrieve the publicly encrypted data without revealing the original data contents. It offers a perfect cryptographic solution to encrypted data retrieval in encrypted data storage systems. Certificateless cryptography (CLC) is a novel cryptographic primitive that has many merits. It overcomes the key escrow problem in identity-based cryptosystems and the cumbersome certificate problem in conventional public key cryptosystems. Motivated by the appealing features of CLC, three certificateless encryption with keyword search (CLEKS) schemes were presented in the literature. However, all of them were constructed with the costly bilinear pairing and thus are not suitable for the devices that have limited computing resources and battery power. So, it is interesting and worthwhile to design a CLEKS scheme without using bilinear pairing. In this study, we put forward a pairing-free CLEKS scheme that does not exploit bilinear pairing. We strictly prove that the scheme achieves keyword ciphertext indistinguishability against adaptive chosen-keyword attacks under the complexity assumption of the computational Diffie-Hellman problem in the random oracle model. Efficiency comparison and the simulation show that it enjoys better performance than the previous pairing-based CLEKS schemes. In addition, we briefly introduce three extensions of the proposed CLEKS scheme.
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Yang LU and Ji-guo LI declare that they have no conflict of interest.
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Project supported by the National Natural Science Foundation of China (Nos. 61772009 and U1736112), the Fundamental Research Funds for the Central Universities, China (Nos. 2016B10114 and 2017B17014), and the Natural Science Foundation of Jiangsu Province, China (No. BK20181304)
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Lu, Y., Li, Jg. Constructing pairing-free certificateless public key encryption with keyword search. Frontiers Inf Technol Electronic Eng 20, 1049–1060 (2019). https://doi.org/10.1631/FITEE.1700534
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DOI: https://doi.org/10.1631/FITEE.1700534
Key words
- Searchable public key encryption
- Certificateless public key encryption with keyword search
- Bilinear pairing
- Computational Diffie-Hellman problem