Threshold Multi-Signature with an Offline Recovery Party

Riccardo Longo; Alessio Meneghetti; Massimiliano Sala

Paper 2020/023

Threshold Multi-Signature with an Offline Recovery Party

Riccardo Longo, Alessio Meneghetti, and Massimiliano Sala

Abstract

Key custody is a sensitive aspect of cryptocurrencies. The employment of a custodian service together with threshold-multi-party signatures helps to manage secret keys more safely and effectively, e.g. allowing the recovery of crypto-assets when users lose their own keys. Advancing from a protocol by Gennaro et al. we propose a protocol with two main properties. First it allows the recovery party to remain offline during the enrollment of any user, solving a real-life problem of maintaining online only one trusted third party. Second our multi-party signature is compatible with a deterministic derivation of public and private keys.

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Preprint. MINOR revision.
Keywords: digital signatures threshold cryptography secure multi-party computation cryptocurrency threshold signature provable security
Contact author(s): riccardolongomath @ gmail com
almenegh @ gmail com
maxsalacodes @ gmail com
History: 2020-01-09: revised; 2020-01-09: received; See all versions
Short URL: https://ia.cr/2020/023
License: CC BY

BibTeX

@misc{cryptoeprint:2020/023,
      author = {Riccardo Longo and Alessio Meneghetti and Massimiliano Sala},
      title = {Threshold Multi-Signature with an Offline Recovery Party},
      howpublished = {Cryptology {ePrint} Archive, Paper 2020/023},
      year = {2020},
      url = {https://eprint.iacr.org/2020/023}
}