On the Security of the Lee-Chang Group Signature Scheme and Its Derivatives

Authors:
Marc Joye;Narn-Yih Lee;Tzonelih Hwang
Affiliations:
-;-;-
Venue:
ISW '99 Proceedings of the Second International Workshop on Information Security
Year:
1999

Citing 2
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EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques

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Abstract

W.-B. Lee and C.-C. Chang (1998) proposed a very efficient group signature scheme based on the discrete logarithm problem. This scheme was subsequently improved by Y.-M. Tseng and J.-K. Jan (1999) so that the resulting group signatures are unlinkable. In this paper, we show that any obvious attempt to make unlinkable the Lee-Chang signatures would likely fail. More importantly, we show that both the original Lee-Chang signature scheme and its improved version are universally forgeable.