Abstract
Public key encryption with keyword search (PEKS) is a promising cryptographic mechanism to enable secure search over encrypted data in cloud. The mechanism allows a semi-trusted cloud server to return related encrypted contents without knowing what the query is and what the corresponding contents are. It has been combined with attribute based encryption (ABE) to support more expressiveness in search. Most of the existing searchable ABE schemes, however, are restricted to heavy complexity. In particular, the size of ciphertext and pairing cost in the test phase are both linear in the size of the keyword set, say O(n), where n is the number of keyword. This limitation hinders the scalability of searchable ABE in practice. To address this long-lasting open problem, this paper proposes a new key-policy attribute-based search encryption (KP-ABSE) scheme. Our construction can be regarded as a novel combination of fast decryption, anonymous-like encryption, and KP-ABE technologies. As of independent interest, the scheme is built in asymmetric bilinear groups. The scheme is further proved secure under the asymmetric decisional DBDH, decisional q-BDHE and decisional linear assumptions in the standard model. Compared with existing KP-ABSE schemes, our new scheme achieves the following properties: (1) flexible access structure for search - any monotonic access structure, (2) constant ciphertext size, (3) constant pairing operations in the test phase.
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Acknowledgements
The authors would like to thank the anonymous reviewers for their valuable comments and suggestions to improve the quality of the paper. This work is supported by the National Natural Science Foundation of China (61572303), the Summit of the Six Top Talents Program of Jiangsu Province (Grant No. 2015-DZXX-020). The National Research Foundation, Prime Minister Office, Singapore under its Corporate Laboratory@University Scheme, National University of Singapore, and Singapore Telecommunications Ltd.
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Meng, R., Zhou, Y., Ning, J., Liang, K., Han, J., Susilo, W. (2017). An Efficient Key-Policy Attribute-Based Searchable Encryption in Prime-Order Groups. In: Okamoto, T., Yu, Y., Au, M., Li, Y. (eds) Provable Security. ProvSec 2017. Lecture Notes in Computer Science(), vol 10592. Springer, Cham. https://doi.org/10.1007/978-3-319-68637-0_3
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