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Title:
Efficient and Universally Composable Non-Interactive Zero-Knowledge Proofs of Knowledge with Security Against Adaptive Corruptions
Authors: Anna Lysyanskaya, Leah Namisa Rosenbloom
Abstract:Non-interactive zero-knowledge proofs of knowledge (NIZKPoK) serve as a key building block in many important cryptographic constructions. Achieving universally composable NIZKPoK secure against adaptive corruptions was a long-standing open problem, recently solved by Canetti, Sarkar, and Wang (Asiacrypt’22). This sole known construction requires heavy cryptographic machinery such as correlation-intractable hash functions, and is not ready for use in practice. In this paper, we give constructions of adaptively secure universally composable NIZKPoK in the global random-oracle model; we consider both the programmable and the non-programmable versions of the model. For many practical NIZK proof systems, our constructions incur only a super-polylogarithmic slowdown factor compared to stand-alone security.
ePrint: https://eprint.iacr.org/2022/1484
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