Paper 2017/214
Low Cost Constant Round MPC Combining BMR and Oblivious Transfer
Carmit Hazay, Peter Scholl, and Eduardo Soria-Vazquez
Abstract
In this work, we present two new universally composable, actively secure, constant round multi-party protocols for generating BMR garbled circuits with free-XOR and reduced costs. (1) Our first protocol takes a generic approach using any secret-sharing based MPC protocol for binary circuits, and a correlated oblivious transfer functionality. (2) Our specialized protocol uses secret-sharing based MPC with information-theoretic MACs. This approach is less general, but requires no additional correlated OTs to compute the garbled circuit. In both approaches, the underlying secret-sharing based protocol is only used for one secure $F_2$ multiplication per AND gate. An interesting consequence of this is that, with current techniques, constant round MPC for binary circuits is not much more expensive than practical, non-constant round protocols. We demonstrate the practicality of our second protocol with an implementation, and perform experiments with up to $9$ parties securely computing the AES and SHA-256 circuits. Our running times improve upon the best possible performance with previous BMR-based protocols by 60 times.
Note: Fixed minor issues.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- A minor revision of an IACR publication in ASIACRYPT 2017
- Keywords
- MPCTinyOTBMR
- Contact author(s)
-
eduardo soria-vazquez @ bristol ac uk
carmit hazay @ biu ac il
peter scholl @ cs au dk - History
- 2020-04-13: last of 5 revisions
- 2017-03-02: received
- See all versions
- Short URL
- https://ia.cr/2017/214
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2017/214,
author = {Carmit Hazay and Peter Scholl and Eduardo Soria-Vazquez},
title = {Low Cost Constant Round MPC Combining BMR and Oblivious Transfer},
howpublished = {Cryptology ePrint Archive, Paper 2017/214},
year = {2017},
note = {\url{https://eprint.iacr.org/2017/214}},
url = {https://eprint.iacr.org/2017/214}
}
