Abstract
Nowadays the mobile devices are becoming the necessities in our life, while they are generally resource-constrained, CP-ABE schemes designed for mobile devices should have the property of low computational complexity, therefore Online/Offline mechanism has prospect future in cryptographic mechanism. In this paper, we attempt to construct an unbounded Online/Offline CP-ABE scheme based on a non-monotonic access structure. During the offline phase, most of the computations for encryption are done; during the online phase, we transform the non-monotonic access structure with positive attribute sets into a monotonic access structure which is based on the LSSS access structure with positive and negative attribute sets, then it only needs a small amount of addition and multiplication operations for the rest components of encryption. Compared with the original non-monotonic CP-ABE scheme, our scheme remains the same on the public keys and the master secret keys, with only a small increase in computational complexity. The computational complexity during online phase is very small.
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Acknowledgements
We would like to thank the anonymous reviewers for their invaluable comments on a previous version of this paper. Dr. Fushan Wei is supported by the National Natural Science Foundation of China (Grant No. 61772548).
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Zhang, J., Cheng, Q., Wei, F., Zhang, X. (2017). A Compact Construction for Non-monotonic Online/Offline CP-ABE Scheme. In: Wang, G., Atiquzzaman, M., Yan, Z., Choo, KK. (eds) Security, Privacy, and Anonymity in Computation, Communication, and Storage. SpaCCS 2017. Lecture Notes in Computer Science(), vol 10658. Springer, Cham. https://doi.org/10.1007/978-3-319-72395-2_47
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