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- W3157347515 abstract "In this work, we first present general methods to construct information rate-1 PKE that is (mathsf {KDM}^{(n)})-secure with respect to block-affine functions for any unbounded polynomial n. To achieve this, we propose a new notion of extractor that satisfies reusability, homomorphic, and security against correlated-source attacks, and show how to use this extractor to improve the information rate of the (mathsf {KDM})-secure PKE of Brakerski et al. (Eurocrypt 18). Then, we show how to amplify (mathsf {KDM}) security from block-affine function class into general bounded size circuits via a variant of the technique of Applebaum (Eurocrypt 11), achieving better efficiency. Furthermore, we show how to generalize these approaches to the IBE setting.Additionally, our PKE and IBE schemes are also leakage resilient, with leakage rates (1-o(1)) against a slightly smaller yet still general class – block leakage functions. We can instantiate the required building blocks from (mathsf {LWE}) or (mathsf {DDH})." @default.
- W3157347515 created "2021-05-10" @default.
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- W3157347515 date "2021-01-01" @default.
- W3157347515 modified "2023-10-16" @default.
- W3157347515 title "Rate-1 Key-Dependent Message Security via Reusable Homomorphic Extractor Against Correlated-Source Attacks" @default.
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- W3157347515 doi "https://doi.org/10.1007/978-3-030-75245-3_16" @default.
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