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Paper 2019/1360
Sashimi: Cutting up CSI-FiSh secret keys to produce an actively secure distributed signing protocol
Daniele Cozzo and Nigel P. smart
Abstract
We present the first actively secure variant of a distributed signature scheme based on isogenies. The protocol produces signatures from the recent CSI-FiSh signature scheme. Our scheme works for any access structure, as we use a replicated secret sharing scheme to define the underlying secret sharing; as such it is only practical when the number of maximally unqualified sets is relatively small. This, however, includes the important case of full threshold, and $(n,t)$-threshold schemes when $n$ is small.
Metadata
- Available format(s)
- Category
- Cryptographic protocols
- Publication info
- Published elsewhere. Minor revision. PQC 2020
- Contact author(s)
- daniele cozzo @ kuleuven be,nigel smart @ kuleuven be
- History
- 2020-01-29: last of 2 revisions
- 2019-11-27: received
- See all versions
- Short URL
- https://ia.cr/2019/1360
- License
-
CC BY