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Mathematical Problems in Engineering
Volume 2015, Article ID 314621, 7 pages
http://dx.doi.org/10.1155/2015/314621
Research Article

A Novel Model for Lattice-Based Authorized Searchable Encryption with Special Keyword

1School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2Department of Mathematics, Qiongzhou University, Hainan 572000, China

Received 25 December 2014; Accepted 26 January 2015

Academic Editor: Chin-Chia Wu

Copyright © 2015 Fugeng Zeng and Chunxiang Xu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Data stored in the cloud servers, keyword search, and access controls are two important capabilities which should be supported. Public-keyword encryption with keyword search (PEKS) and attribute based encryption (ABE) are corresponding solutions. Meanwhile, as we step into postquantum era, pairing related assumption is fragile. Lattice is an ideal choice for building secure encryption scheme against quantum attack. Based on this, we propose the first mathematical model for lattice-based authorized searchable encryption. Data owners can sort the ciphertext by specific keywords such as time; data users satisfying the access control hand the trapdoor generated with the keyword to the cloud sever; the cloud sever sends back the corresponding ciphertext. The security of our schemes is based on the worst-case hardness on lattices, called learning with errors (LWE) assumption. In addition, our scheme achieves attribute-hiding, which could protect the sensitive information of data user.