2026-07-29T10:04:51Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:16483 2024-03-06T10:57:36Z ddc:004 open_access

From Privacy-Only to Simulatable OT: Black-Box, Round-Optimal, Information-Theoretic Madathil, Varun Orsini, Chris Scafuro, Alessandra Venturi, Daniele Oblivious Transfer Black-Box compiler Malicious Security Plain Model 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. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Varun Madathil and Chris Orsini and Alessandra Scafuro and Daniele Venturi 2022 Is Part Of LIPIcs, Volume 230, 3rd Conference on Information-Theoretic Cryptography (ITC 2022) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.ITC.2022.5 urn:nbn:de:0030-drops-164836 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ITC.2022.5 eng https://creativecommons.org/licenses/by/4.0/legalcode