Towards the Forgery of a Group Signature without Knowing the Group Center's Secret

Authors:
Chin-Chen Chang;Kuo-Feng Hwang
Affiliations:
-;-
Venue:
ICICS '01 Proceedings of the Third International Conference on Information and Communications Security
Year:
2001

Citing 3
Cited 0

On the security of a convertible group signature scheme

Information Processing Letters
Convertible Group Signatures

ASIACRYPT '96 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
Group signatures

EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques

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Abstract

A group signature scheme allows the group member to sign messages on behalf of a group. In 1996, Kim et al. proposed a new type of group signature, called "convertible group signature". Recently, Saeednia pointed out that there are weaknesses in a convertible group signature scheme proposed by Kim et al. Furthermore, Saeednia proposed a modified scheme to eliminate these weaknesses. In this paper, we show that there is a way to forge a group signature even if adopting Saeednia's modified scheme.