Welcome to the resource topic for 2018/833
Title:
Improved Inner-product Encryption with Adaptive Security and Full Attribute-hiding
Authors: Jie Chen, Junqing Gong, 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.
ePrint: https://eprint.iacr.org/2018/833
Slides: https://asiacrypt.iacr.org/2018/files/SLIDES/WEDNESDAY/P421/1315-1520/ahipe.pdf
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