Cryptanalysis of a Dynamic Threshold Group Signature Scheme
Guo Xing-yang, Quan Zhang · Journal of National University of Defense Technology · 2005
The threshold group signature is a generalization of group signature, in which only authorized subset can represent the group to generate signature and the identities of signers of a signature can be opened in case of later dispute. We point out the redundancy of a dynamic threshold group signature scheme and demonstrate three attacks on it. The security analysis indicates that the scheme is not secure against framing attack and cannot resist conspiratorial attack and the threshold value cannot be renewed safely.