Paper Info
Title
Fast Large-Scale Honest-Majority MPC for Malicious Adversaries.
Abstract
Protocols for secure multiparty computation enable a set of parties to compute a function of their inputs without revealing anything but the output. The security properties of the protocol must be preserved in the presence of adversarial behavior. The two classic adversary models considered are semi-honest (where the adversary follows the protocol specification but tries to learn more than allowed by examining the protocol transcript) and malicious (where the adversary may follow any arbitrary attack strategy). Protocols for semi-honest adversaries are often far more efficient, but in many cases the security guarantees are not strong enough. In this paper, we present new protocols for securely computing any functionality represented by an arithmetic circuit. We utilize a new method for verifying that the adversary does not cheat, that yields a cost of just twice that of semi-honest protocols in some settings. Our protocols are information-theoretically secure in the presence of a malicious adversaries, assuming an honest majority. We present protocol variants for small and large fields, and show how to efficiently instantiate them based on replicated secret sharing and Shamir sharing. As with previous works in this area aiming to achieve high efficiency, our protocol is secure with abort and does not achieve fairness, meaning that the adversary may receive output while the honest parties do not. We implemented our protocol and ran experiments for different numbers of parties, different network configurations and different circuit depths. Our protocol significantly outperforms the previous best for this setting (Lindell and Nof, CCS 2017); for a large number of parties, our implementation runs almost an order of magnitude faster than theirs.
Year
DOI
Venue
2018
10.1007/978-3-319-96878-0_2
ADVANCES IN CRYPTOLOGY - CRYPTO 2018, PT III
DocType
Volume
ISSN
Conference
10993
0302-9743
Citations 
PageRank 
References 
3
0.37
18
Authors
7
Name
Order
Citations
PageRank
Koji Chida17312.49
Daniel Genkin257931.18
Koki Hamada36110.92
Dai Ikarashi4276.33
Ryo Kikuchi5469.37
Yehuda Lindell64194215.46
Ariel Nof7936.24