Paper 2002/167
Cryptanalysis of Two New Signature Schemes
Fangguo Zhang and Kwangjo Kim
Abstract
Group signature and blind signature are very important primitives in cryptography. A group signature scheme allows a group member to sign messages anonymously on behalf of the group and a blind signature scheme can ensure anonymity of the sender of a message. Recently, S. Xia and J. You proposed a group signature scheme with strong separability in which the revocation manager can work without the involvement of the membership manager and J.J-R. Chen and A.P. Chen proposed a blind signature scheme based on dual complexities (which combines factorization and discrete logarithm problem). In this paper, we give a universal forgery attack on Xia-You's group signature scheme which any one (not necessarily a group member) can produce a valid group signature on an arbitrary message, and it is untraceable by the group revocation manager. For Chen-Chen's blind signature scheme, we show that it could not meet the untraceability property of a blind signature, $i.e.$, it could not ensure anonymity of the user.
Metadata
- Available format(s)
-
PDF
PS
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- Group signatureBlind signatureCryptanalysis
- Contact author(s)
- zhfg @ icu ac kr
- History
- 2002-11-12: received
- Short URL
- https://ia.cr/2002/167
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2002/167,
author = {Fangguo Zhang and Kwangjo Kim},
title = {Cryptanalysis of Two New Signature Schemes},
howpublished = {Cryptology {ePrint} Archive, Paper 2002/167},
year = {2002},
url = {https://eprint.iacr.org/2002/167}
}
