### Democratic Group Signatures with Threshold Traceability

Dong Zheng, Xiangxue Li, Changshe Ma, Kefei Chen, and 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.

Available format(s)
Category
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
democratic group signatureanonymitytraceabilitythreshold traceability
Contact author(s)
xxli @ sjtu edu cn
History
2008-03-16: revised
See all versions
Short URL
https://ia.cr/2008/112

CC BY

BibTeX

@misc{cryptoeprint:2008/112,
author = {Dong Zheng and Xiangxue Li and Changshe Ma and Kefei  Chen and Jianhua Li},
title = {Democratic Group Signatures with Threshold Traceability},
howpublished = {Cryptology ePrint Archive, Paper 2008/112},
year = {2008},
note = {\url{https://eprint.iacr.org/2008/112}},
url = {https://eprint.iacr.org/2008/112}
}

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