Welcome to the resource topic for 2008/112
Title:
Democratic Group Signatures with Threshold Traceability
Authors: Dong Zheng, Xiangxue Li, Changshe Ma, Kefei Chen, Jianhua Li
Abstract:Recently, democratic group signatures(DGSs) particularly catch our attention due to their great flexibilities, \emph{i.e}., \emph{no group manager}, \emph{anonymity}, and \emph{individual traceability}. In existing DGS schemes, individual traceability says that any member in the group can reveal the actual signer’s identity from a given signature. In this paper, we formally describe the definition of DGS, revisit its security notions by strengthening the requirement for the property of traceability, and present a concrete DGS construction with (t, n)-\emph{threshold traceability} which combines the concepts of group signatures and of threshold cryptography. The idea behind the (t, n)-threshold traceability is to distribute between n group members the capability of tracing the actual signer such that any subset of not less than t members can jointly reconstruct a secret and reveal the identity of the signer while preserving security even in the presence of an active adversary which can corrupt up to t-1 group members.
ePrint: https://eprint.iacr.org/2008/112
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