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Security and Communication Networks
Volume 2017, Article ID 7323158, 19 pages
https://doi.org/10.1155/2017/7323158
Research Article

Shorter Decentralized Attribute-Based Encryption via Extended Dual System Groups

1State Key Laboratory of Mathematical Engineering and Advanced Computing, Zhengzhou, China
2East China Normal University, Shanghai, China
3Army Aviation Institute, Beijing, China

Correspondence should be addressed to Jie Zhang; nc.anis@209eijgnahz

Received 10 April 2017; Revised 14 July 2017; Accepted 6 August 2017; Published 18 October 2017

Academic Editor: Zonghua Zhang

Copyright © 2017 Jie Zhang et al. 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

Decentralized attribute-based encryption (ABE) is a special form of multiauthority ABE systems, in which no central authority and global coordination are required other than creating the common reference parameters. In this paper, we propose a new decentralized ABE in prime-order groups by using extended dual system groups. We formulate some assumptions used to prove the security of our scheme. Our proposed scheme is fully secure under the standard -Lin assumption in random oracle model and can support any monotone access structures. Compared with existing fully secure decentralized ABE systems, our construction has shorter ciphertexts and secret keys. Moreover, fast decryption is achieved in our system, in which ciphertexts can be decrypted with a constant number of pairings.