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Paper: Improved Inner-Product Encryption with Adaptive Security and Full Attribute-Hiding

Authors: Jie Chen Junqing Gong Hoeteck Wee DOI: 10.1007/978-3-030-03329-3_23 Search ePrint Search Google Slides ASIACRYPT 2018 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 $k\textsc {-lin}$ assumption and has shorter master public key and shorter secret keys than Okamoto and Takashima’s IPE under weaker ${\textsc {dlin} }=2\textsc {-lin}$ assumption.Our second IPE scheme is adapted from the first one; the security is based on the ${\textsc {xdlin}}$ 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.
BibTeX
@inproceedings{asiacrypt-2018-29179,
title={Improved Inner-Product Encryption with Adaptive Security and Full Attribute-Hiding},
booktitle={Advances in Cryptology – ASIACRYPT 2018},
series={Lecture Notes in Computer Science},
publisher={Springer},
volume={11273},
pages={673-702},
doi={10.1007/978-3-030-03329-3_23},
author={Jie Chen and Junqing Gong and Hoeteck Wee},
year=2018
}