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- W2553733191 abstract "In this paper, we demonstrate that various cryptographic constructions—including ones for broadcast, attribute-based, and hierarchical identity-based encryption—can rely for security on only the static subgroup hiding assumption when instantiated in composite-order bilinear groups, as opposed to the dynamic q-type assumptions on which their security previously was based. This specific goal is accomplished by more generally extending the recent Déjà Q framework (Chase and Meiklejohn, Eurocrypt 2014) in two main directions. First, by teasing out common properties of existing reductions, we expand the q-type assumptions that can be covered by the framework; i.e., we demonstrate broader classes of assumptions that can be reduced to subgroup hiding. Second, while the original framework applied only to asymmetric composite-order bilinear groups, we provide a reduction to subgroup hiding that works in symmetric (as well as asymmetric) composite-order groups. As a bonus, our new reduction achieves a tightness of $$log (q)$$ rather than q." @default.
- W2553733191 created "2016-11-30" @default.
- W2553733191 creator A5016806686 @default.
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- W2553733191 date "2016-01-01" @default.
- W2553733191 modified "2023-10-18" @default.
- W2553733191 title "Déjà Q All Over Again: Tighter and Broader Reductions of q-Type Assumptions" @default.
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- W2553733191 doi "https://doi.org/10.1007/978-3-662-53890-6_22" @default.
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