Ordered Multi-Signatures with Public-Key Aggregation from SXDH Assumption
Abstract
An ordered multi-signature scheme allows multiple signers to sign a common message in a sequential manner and allows anyone to verify the signing order of signers with a public-key list. In this work, we propose an ordered multi-signature scheme by modifying the sequential aggregate signature scheme by Chatterjee and Kabaleeshwaran (ACISP 2020). Our scheme offers compact public parameter size and the public-key aggregation property. This property allows us to compress a public-key list into a short aggregated key. We prove the security of our scheme under the symmetric external Diffie-Hellman (SXDH) assumption without the random oracle model.
Cite
@article{arxiv.2509.17709,
title = {Ordered Multi-Signatures with Public-Key Aggregation from SXDH Assumption},
author = {Masayuki Tezuka and Keisuke Tanaka},
journal= {arXiv preprint arXiv:2509.17709},
year = {2025}
}
Comments
A preliminary version of this paper is appeared in the 20th International Workshop on Security (IWSEC 2025)