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From Privacy-Only to Simulatable OT: Black-Box, Round-Optimal, Information-Theoretic

Authors: Varun Madathil, Chris Orsini, Alessandra Scafuro, and Daniele Venturi

Published in: LIPIcs, Volume 230, 3rd Conference on Information-Theoretic Cryptography (ITC 2022)


Abstract
We present an information-theoretic transformation from any 2-round OT protocol with only game-based security in the presence of malicious adversaries into a 4-round (which is known to be optimal) OT protocol with simulation-based security in the presence of malicious adversaries. Our transform is the first satisfying all of the following properties at the same time: - It is in the plain model, without requiring any setup assumption. - It only makes black-box usage of the underlying OT protocol. - It is information-theoretic, as it does not require any further cryptographic assumption (besides the existence of the underlying OT protocol). Additionally, our transform yields a cubic improvement in communication complexity over the best previously known transformation.

Cite as

Varun Madathil, Chris Orsini, Alessandra Scafuro, and Daniele Venturi. From Privacy-Only to Simulatable OT: Black-Box, Round-Optimal, Information-Theoretic. In 3rd Conference on Information-Theoretic Cryptography (ITC 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 230, pp. 5:1-5:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)


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@InProceedings{madathil_et_al:LIPIcs.ITC.2022.5,
  author =	{Madathil, Varun and Orsini, Chris and Scafuro, Alessandra and Venturi, Daniele},
  title =	{{From Privacy-Only to Simulatable OT: Black-Box, Round-Optimal, Information-Theoretic}},
  booktitle =	{3rd Conference on Information-Theoretic Cryptography (ITC 2022)},
  pages =	{5:1--5:20},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-238-9},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{230},
  editor =	{Dachman-Soled, Dana},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ITC.2022.5},
  URN =		{urn:nbn:de:0030-drops-164836},
  doi =		{10.4230/LIPIcs.ITC.2022.5},
  annote =	{Keywords: Oblivious Transfer, Black-Box compiler, Malicious Security, Plain Model}
}
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