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Title:
Untraceability of Two Group Signature Schemes
Authors: 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 fashion. In case of
a dispute, however, a designated group manager can reveal
the signer of a valid group signature. In the paper, we
show the untraceability of two group signatures in [1, 5] by new and very simple attacks.
Although those flaws, such as, forgeability,
untraceability and linkability have been shown in [2, 7, 8, 9], we should point out that our attacks are more simple.
ePrint: https://eprint.iacr.org/2005/055
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