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Bingo: Adaptivity and Asynchrony in Verifiable Secret Sharing and Distributed Key Generation

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Advances in Cryptology – CRYPTO 2023 (CRYPTO 2023)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 14081))

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Abstract

We present \(\textsf{Bingo}\), an adaptively secure and optimally resilient packed asynchronous verifiable secret sharing (PAVSS) protocol that allows a dealer to share \(f+1\) secrets with a total communication complexity of \(O(\lambda n^2)\) words, where \(\lambda \) is the security parameter and n is the number of parties. Using \(\textsf{Bingo}\), we obtain an adaptively secure validated asynchronous Byzantine agreement (VABA) protocol that uses \(O(\lambda n^3)\) expected words and constant expected time, which we in turn use to construct an adaptively secure high-threshold asynchronous distributed key generation (ADKG) protocol that uses \(O(\lambda n^3)\) expected words and constant expected time. To the best of our knowledge, our ADKG is the first to allow for an adaptive adversary while matching the asymptotic complexity of the best known static ADKGs.

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Notes

  1. 1.

    https://explore.flashbots.net/.

  2. 2.

    For a threshold of \(f+m+1\), define \(I'=\{i_{f+1},\ldots ,i_{f+m}\}\) instead.

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Acknowledgements

We would like to thank Alin Tomescu, Kobi Gurkan, Julian Loss, and Renas Bacho for many insightful discussions. Gilad Stern was supported by the HUJI Federmann Cyber Security Research Center in conjunction with the Israel National Cyber Directorate (INCD) in the Prime Minister’s Office.

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Authors and Affiliations

  1. Intel Labs, Petach Tikva, Israel

    Ittai Abraham

  2. University College London, London, UK

    Philipp Jovanovic & Sarah Meiklejohn

  3. Ethereum Foundation and PQShield, Bern, Switzerland

    Mary Maller

  4. Google, Mountain View, USA

    Sarah Meiklejohn

  5. The Hebrew University of Jerusalem, Jerusalem, Israel

    Gilad Stern

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  1. Ittai Abraham
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Correspondence to Gilad Stern .

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Editors and Affiliations

  1. Rambus Inc., San Jose, CA, USA

    Helena Handschuh

  2. Brown University, Providence, RI, USA

    Anna Lysyanskaya

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Abraham, I., Jovanovic, P., Maller, M., Meiklejohn, S., Stern, G. (2023). Bingo: Adaptivity and Asynchrony in Verifiable Secret Sharing and Distributed Key Generation. In: Handschuh, H., Lysyanskaya, A. (eds) Advances in Cryptology – CRYPTO 2023. CRYPTO 2023. Lecture Notes in Computer Science, vol 14081. Springer, Cham. https://doi.org/10.1007/978-3-031-38557-5_2

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