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Open AccessArticle

A Novel Lattice-Based CP-ABPRE Scheme for Cloud Sharing

by Juyan Li 1, Chunguang Ma 2,3 and Kejia Zhang 1,*
College of Data Science and Technology, Heilongjiang University, Harbin 150080, China
College of Computer Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100093, China
Author to whom correspondence should be addressed.
Symmetry 2019, 11(10), 1262;
Received: 7 September 2019 / Revised: 30 September 2019 / Accepted: 3 October 2019 / Published: 9 October 2019
The ciphertext-policy attribute-based proxy re-encryption (CP-ABPRE) scheme supports access control and can transform a ciphertext under an access policy to a ciphertext under another access policy without decrypting the ciphertexts, which is flexible and efficient for cloud sharing. The existing CP-ABPRE schemes are constructed by bilinear pairing or multi-linear maps which are fragile when the post-quantum future comes. This paper presents an efficient unidirectional single-hop CP-ABPRE scheme with small public parameters from a lattice. For the transformation between two access structures, they are required to be disjoint. This paper uses the trapdoor sampling technique to generate the decryption key and the re-encryption key in constructing the scheme, and uses the decompose vectors technique to produce the re-encrypted ciphertexts in order to control their noise. Finally, we extended the scheme to a unidirectional single-hop CP-ABPRE scheme with keyword search for searching the encrypted data. Both schemes were proved secure under the learning with errors assumption, which is widely believed to be secure in quantum computer attacks. To the best of our knowledge, our scheme is the first CP-ABPRE scheme based on the learning with errors assumption. View Full-Text
Keywords: LWE; proxy re-encryption; attribute-based encryption; cloud sharing LWE; proxy re-encryption; attribute-based encryption; cloud sharing
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MDPI and ACS Style

Li, J.; Ma, C.; Zhang, K. A Novel Lattice-Based CP-ABPRE Scheme for Cloud Sharing. Symmetry 2019, 11, 1262.

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