Title: Revocable hierarchical identity-based encryption over lattice for pay-TV systems

Authors: Leyou Zhang; Zongchen Sun; Yi Mu; Yupu Hu

Addresses: School of Mathematics and Statistics, Xidian University, Xi'an, 710071, Shaanxi, China ' School of Mathematics and Statistics, Xidian University, Xi'an, 710071, Shaanxi, China ' School of Computer Science and Engineering, University of Wollongong, 2500, Wollongong, Australia ' School of Telecommunications Engineering, Xidian University, Xi'an, 710071, Shaanxi, China

Abstract: In case the subscriber's certificate may be expired or revealed, a revocable mechanism is needed in a dynamic pay-TV system. Considering the hierarchical structure in this system, a revocable hierarchical identity-based encryption (RHIBE) scheme is a better choice than other schemes. But the well-known RHIBE schemes are constructed on the bilinear pairings. In this paper, two efficient and practical schemes are issued on lattice. Our first scheme is secure against adaptive identity-time attacks in the random oracle (RO) model and the second is against selective identity-time attacks in standard model. The security of both schemes is reduced to the learning with errors (LWE) assumption. In particular, the proposed scheme's basis delegation algorithms are run in the fixed dimension and the ciphertexts are shorter than existing schemes. Both schemes are much more efficient than the known works in terms of computation cost and storage cost.

Keywords: pay-TV; revocable HIBE; lattice; learning with errors; LWE; subset-cover revocation.

DOI: 10.1504/IJES.2017.086121

International Journal of Embedded Systems, 2017 Vol.9 No.4, pp.379 - 398

Received: 20 Aug 2015
Accepted: 19 Dec 2015
Published online: 27 Aug 2017 *

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