On Anonymity of Group Signatures

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On Anonymity of Group Signatures
A secure group signature is required to be anonymous, that is, given two group signatures generated by two different members on the same message or two group signatures generated by the same member on two different messages, they are indistinguishable except for the group manager. In this paper we prove the equivalence of a group signature’s anonymity and its indistinguishability against chosen ciphertext attacks if we view a group signature as an encryption of member identity. Particularly, we prove ACJT’s group signature is IND-CCA2 secure, so ACJT’s scheme is anonymous in the strong sense. The result is an answer to an open question in literature.
Sujing Zhou, Dongdai Lin
Added 26 Jun 2010
Updated 26 Jun 2010
Type Conference
Year 2005
Where CIS
Authors Sujing Zhou, Dongdai Lin
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