Paper 2026/1213 Original: eprint.iacr.org/2026/1213 ↗
Another Look at Non-Frameability in Group Signatures for Anonymous Auctions
Abstract
In addition to anonymity and traceability, which are the primary security properties of group signatures, non‑frameability is also defined (Bellare-Shi-Zhang, CT-RSA 2005). This property guarantees that even an adversary colluding with all authorities (the opener and the issuer) cannot produce a signature that frames an honest user, and it is regarded as a security notion that protects users. In this short note, we introduce a new perspective on non-frameability, namely that it can also protect the authorities, and we examine its significance in the context of anonymous auctions, a well‑known application of group signatures. We show that non-frameability serves as an effective countermeasure against situations in which a winning bidder falsely claims not to have placed a bid and accuses the organizer of forgery.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2026-06-09: last updated
- 2026-06-09: published
- Short URL
- https://ia.cr/2026/1213
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2026/1213,
author = {Cao Shiqi and Keita Emura},
title = {Another Look at Non-Frameability in Group Signatures for Anonymous Auctions},
howpublished = {Cryptology {ePrint} Archive, Paper 2026/1213},
year = {2026},
url = {https://eprint.iacr.org/2026/1213}
}