Paper 2023/1094
Round Optimal Fully Secure Distributed Key Generation
, DfnsAbstract
Protocols for distributed (threshold) key generation (DKG) in the discrete-logarithm setting have received a tremendous amount of attention in the past few years. Several synchronous DKG protocols have been proposed, but most such protocols are not fully secure: they either allow corrupted parties to bias the key, or are not robust and allow malicious parties to prevent successful generation of a key. We explore the round complexity of fully secure DKG in the honest-majority setting where it is feasible. We show the impossibility of one-round, unbiased DKG protocols (even satisfying weaker notions of security), regardless of any prior setup. On the positive side, we show various round-optimal protocols for fully secure DKG offering tradeoffs in terms of their efficiency, necessary setup, and required assumptions.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Published by the IACR in CRYPTO 2024
- Keywords
- threshold cryptographykey generation
- Contact author(s)
- jkatz2 @ gmail com
- History
- 2024-05-28: last of 3 revisions
- 2023-07-13: received
- See all versions
- Short URL
- https://ia.cr/2023/1094
- License
-
CC BY-NC-ND
BibTeX
@misc{cryptoeprint:2023/1094,
author = {Jonathan Katz},
title = {Round Optimal Fully Secure Distributed Key Generation},
howpublished = {Cryptology ePrint Archive, Paper 2023/1094},
year = {2023},
note = {\url{https://eprint.iacr.org/2023/1094}},
url = {https://eprint.iacr.org/2023/1094}
}
