Paper 2018/833
Improved Inner-product Encryption with Adaptive Security and Full Attribute-hiding
Jie Chen, Junqing Gong, and Hoeteck Wee
Abstract
In this work, we propose two IPE schemes achieving both adaptive security and full attribute-hiding in the prime-order bilinear group, which improve upon the unique existing result satisfying both features from Okamoto and Takashima [Eurocrypt '12] in terms of efficiency. - Our first IPE scheme is based on the standard $k$-Lin assumption and has shorter master public key and shorter secret keys than Okamoto and Takashima's IPE under weaker DLIN=$2$-lin assumption. - Our second IPE scheme is adapted from the first one; the security is based on the XDLIN assumption (as Okamoto and Takashima's IPE) but now it also enjoys shorter ciphertexts. Technically, instead of starting from composite-order IPE and applying existing transformation, we start from an IPE scheme in a very restricted setting but already in the prime-order group, and then gradually upgrade it to our full-fledged IPE scheme. This method allows us to integrate Chen et al.'s framework [Eurocrypt '15] with recent new techniques [TCC '17, Eurocrypt '18] in an optimized way.
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- A minor revision of an IACR publication in ASIACRYPT 2018
- Contact author(s)
-
s080001 @ e ntu edu sg
junqing gong @ ens-lyon fr
wee @ di ens fr - History
- 2018-09-06: received
- Short URL
- https://ia.cr/2018/833
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2018/833,
author = {Jie Chen and Junqing Gong and Hoeteck Wee},
title = {Improved Inner-product Encryption with Adaptive Security and Full Attribute-hiding},
howpublished = {Cryptology {ePrint} Archive, Paper 2018/833},
year = {2018},
url = {https://eprint.iacr.org/2018/833}
}
