Paper 2024/1143
LR-OT: Leakage-Resilient Oblivious Transfer
, Bar-Ilan University, Ramat-Gan, Israel, Bar-Ilan University, Ramat-Gan, Israel, Bar-Ilan University, Ramat-Gan, IsraelAbstract
Oblivious Transfer (OT) is a fundamental cryptographic primitive, becoming a crucial component of a practical secure protocol. OT is typically implemented in software, and one way to accelerate its running time is by using hardware implementations. However, such implementations are vulnerable to side-channel attacks (SCAs). On the other hand, protecting interactive protocols against SCA is highly challenging because of their longer secrets (which include inputs and randomness), more complicated design, and running multiple instances. Consequently, there are no truly practical leakage-resistant OT protocols yet. In this paper, we introduce two tailored indistinguishability-based security definitions for leakage-resilient OT, focusing on protecting the sender's state. Second, we propose a practical semi-honest secure OT protocol that achieves these security levels while minimizing the assumptions on the protocol's building blocks and the use of a secret state. Finally, we extend our protocol to support sequential composition and explore efficiency-security tradeoffs.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Published elsewhere. Major revision. SCN 2024
- Keywords
- Oblivious transferLeakage-resilient
- Contact author(s)
-
francesco berti @ biu ac il
Carmit Hazay @ biu ac il
itamar levi @ biu ac il - History
- 2024-07-15: approved
- 2024-07-13: received
- See all versions
- Short URL
- https://ia.cr/2024/1143
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2024/1143,
author = {Francesco Berti and Carmit Hazay and Itamar Levi},
title = {{LR}-{OT}: Leakage-Resilient Oblivious Transfer},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/1143},
year = {2024},
url = {https://eprint.iacr.org/2024/1143}
}
