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Paper 2019/114
Fast Multiparty Threshold ECDSA with Fast Trustless Setup
Rosario Gennaro and Steven Goldfeder
Abstract
A threshold signature scheme enables distributed signing among $n$ players such that any subgroup of size $t+1$ can sign, whereas any group with $t$ or fewer players cannot. While there exist previous threshold schemes for the ECDSA signature scheme, we present the first protocol that supports multiparty signatures for any $t \leq n$ with efficient, dealerless key generation. Our protocol is faster than previous solutions and significantly reduces the communication complexity as well. We prove our scheme secure against malicious adversaries with a dishonest majority. We implemented our protocol, demonstrating its efficiency and suitability to be deployed in practice.
Metadata
- Available format(s)
- Category
- Cryptographic protocols
- Publication info
- Published elsewhere. Minor revision. ACM CCS 2018
- Contact author(s)
- goldfeder @ cornell edu
- History
- 2021-12-17: revised
- 2019-02-07: received
- See all versions
- Short URL
- https://ia.cr/2019/114
- License
-
CC BY