Welcome to the resource topic for 2021/1665
Title:
Leakage-Resilient IBE/ABE with Optimal Leakage Rates from Lattices
Authors: Qiqi Lai, Feng-Hao Liu, Zhedong Wang
Abstract:We derive the first adaptively secure IBE and ABE for t-CNF, and selectively secure ABE for general circuits from lattices, with 1-o(1) leakage rates, in the both relative leakage model and bounded retrieval model (BRM). To achieve this, we first identify a new fine-grained security notion for ABE – partially adaptive/selective security, and instantiate this notion from LWE. Then, by using this notion, we design a new key compressing mechanism for identity-based/attributed-based weak hash proof system (IB/AB-wHPS) for various policy classes, achieving (1) succinct secret keys and (2) adaptive/selective security matching the existing non-leakage resilient lattice-based designs. Using the existing connection between weak hash proof system and leakage resilient encryption, the succinct-key IB/AB-wHPS can yield the desired leakage resilient IBE/ABE schemes with the optimal leakage rates in the relative leakage model. Finally, by further improving the prior analysis of the compatible locally computable extractors, we can achieve the optimal leakage rates in the BRM.
ePrint: https://eprint.iacr.org/2021/1665
Talk: https://www.youtube.com/watch?v=NOCS9lqq-pk
See all topics related to this paper.
Feel free to post resources that are related to this paper below.
Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.
For more information, see the rules for Resource Topics .