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Analyzing Unlinkability of Some Group Signatures
Authors: Zhou Sujing, Lin DongdaiAbstract:
Miyaji et.al proposed a fully functional(i.e., satisfying
unforgeability, exculpability,anonymity, traceability,
unlinkability, and revocability.) group signature over only
known-order groups, that is based only on Discrete logarithm
related assumptions, specifically, multiple DLP they proposed in
the same paper [MU04]. In this paper, we point out their
scheme and an improved scheme [ZZW05] do not have unlinkability.
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