CryptoDB

Paper: Democratic Group Signatures with Threshold Traceability

Authors: Kefei Chen Xiangxue Li Dong Zheng Changshe Ma Jianhua Li URL: http://eprint.iacr.org/2008/112 Search ePrint Search Google 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.
BibTeX
@misc{eprint-2008-17789,
title={Democratic Group Signatures with Threshold Traceability},
booktitle={IACR Eprint archive},
keywords={public-key cryptography / democratic group signature, anonymity, traceability,threshold traceability},
url={http://eprint.iacr.org/2008/112},
note={ xxli@sjtu.edu.cn 13954 received 12 Mar 2008, last revised 16 Mar 2008},
author={Kefei  Chen and Xiangxue Li and Dong Zheng and Changshe Ma and Jianhua Li},
year=2008
}