Title: Security Limits of the LHL Threshold Group Signature Scheme
Abstract: Threshold group signature is a generalization of group signature, in which only authorized subset can represent a group to generate signature and the identities of signers of a signature can be opened in case of dispute later on. So, an important security requirement to a threshold group signature is nonforgeability, i.e. an authorized subset should not impersonate another authorized subset to generate signature. In this paper, we point out two security limits of LHL threshold group signature scheme: the existence of signature forgery attack and the failure to possess anonymity and traceability at the same time. In the forgery attack, after the group secret key is controlled, part of members can forge a valid threshold group signature which looks like a signature produced by other members. But all the honest members can not discover this cheating behavior, because they can use the system normally to generate group signatures.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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Cited By Count: 1
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