Welcome to the resource topic for 2005/353
Title:
On the Security of A Group Signature Scheme
Authors: Jianhong Zhang, Wei Zou
Abstract:As a special digital signature, a group signature scheme al-
lows a group member to sign message on behalf of the group in an anony-mous and unlinkability way, In case of a dispute, the group manager can reveal the actual identity of signer. Anonymity and unlinkability are
basic properties of group signature, which distinguish other signature
scheme. Recently, based on the work of Camenisch and Lysyanskaya,
which is known to be the most e±cient scheme so far, E.Y.Choi et.al
propose an e±cient group signature scheme with member revocation at
TrustBus 2005. Unfortunately, in this work we show that the scheme
has linkability, Namely, any one can distinguish whether two di®erent
group signatures are produced by the same signer, and that the revo-
cation manager cannot trace the actual identity of a signer by a group
signature. Finally, we give the corresponding attack to the scheme.
ePrint: https://eprint.iacr.org/2005/353
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