Paper 2024/1286 Original: eprint.iacr.org/2024/1286 ↗
Towards a Tightly Secure Signature in Multi-User Setting with Corruptions Based on Search Assumptions
Abstract
This paper is a report on how we tackled constructing a digital signature scheme whose multi-user security with corruption can be tightly reduced to search assumptions. We fail to (dis)prove the statement but obtain the following new results: - We reveal two new properties of signature schemes whose security cannot be tightly reduced to standard assumptions. - We construct a new signature scheme. Its multi-user security with corruption is reduced to the CDH assumption (in the ROM), and its reduction loss is independent of the number of users but depends on the number of RO queries.
Metadata
- Available format(s)
PDF- Category
- Foundations
- Publication info
- Preprint.
- History
- 2024-08-15: last updated
- 2024-08-15: published
- Short URL
- https://ia.cr/2024/1286
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2024/1286,
author = {Hirofumi Yoshioka and Wakaha Ogata and Keitaro Hashimoto},
title = {Towards a Tightly Secure Signature in Multi-User Setting with Corruptions Based on Search Assumptions},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/1286},
year = {2024},
url = {https://eprint.iacr.org/2024/1286}
}