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- W3020909148 abstract "We present a general framework for constructing non-interactive universally composable (UC) commitment schemes that are secure against adaptive adversaries in the non-erasure model under a re-usable common reference string. Previously, such “fully-equipped” UC commitment schemes have been known only in [CF01,CLOS02], with strict expansion factor O(κ); meaning that to commit λ bits, communication strictly requires O(λκ) bits, where κ denotes the security parameter. Efficient construction of a fully-equipped UC commitment scheme is a long-standing open problem. We introduce new abstraction, called all-but-many encryption (ABME), and prove that it captures fully-equipped UC commitment schemes. We propose the first fully-equipped UC commitment scheme with optimal expansion factor O(1) from our ABME scheme related to the DCR assumption. We also provide an all-but-many lossy trapdoor function (ABM-LTF) [Hof12] from our DCR-based ABME scheme, with a better lossy rate than [Hof12]." @default.
- W3020909148 created "2020-05-13" @default.
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- W3020909148 date "2014-01-01" @default.
- W3020909148 modified "2023-09-26" @default.
- W3020909148 title "All-But-Many Encryption - A New Framework for Fully-Equipped UC Commitments." @default.
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