Paper 2005/041
On the Security of a Group Signature Scheme with Strong Separability
Lihua Liu and Zhengjun Cao
Abstract
A group signature scheme allows a group member of a given group to sign messages on behalf of the group in an anonymous and unlinkable fashion. In case of a dispute, however, a designated group manager can reveal the signer of a valid group signature. Many applications of group signatures require that the group manager can be split into a membership manager and a revocation manager. Such a group signature scheme with strong separability was proposed in paper [1]. Unfortunately, the scheme is insecure which has been shown in [2][3][4]. In this paper we show that the scheme is untraceable by a simple and direct attack. Besides, we show its universal forgeability by a general attack which only needs to choose five random numbers. We minutely explain the technique to shun the challenge in the scheme.
Metadata
- Available format(s)
-
PDF
PS
- Category
- Cryptographic protocols
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- Group signatureUntraceabilityUniversal forgeability.
- Contact author(s)
- zjcamss @ hotmail com
- History
- 2005-02-16: received
- Short URL
- https://ia.cr/2005/041
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2005/041,
author = {Lihua Liu and Zhengjun Cao},
title = {On the Security of a Group Signature Scheme with Strong Separability},
howpublished = {Cryptology {ePrint} Archive, Paper 2005/041},
year = {2005},
url = {https://eprint.iacr.org/2005/041}
}
