A digital multisignature scheme using bijective public-key cryptosystems
ACM Transactions on Computer Systems (TOCS)
Communications of the ACM
Efficient and Secure Member Deletion in Group Signature Schemes
ICISC '00 Proceedings of the Third International Conference on Information Security and Cryptology
Dynamic Accumulators and Application to Efficient Revocation of Anonymous Credentials
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Society and Group Oriented Cryptography: A New Concept
CRYPTO '87 A Conference on the Theory and Applications of Cryptographic Techniques on Advances in Cryptology
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
Efficient Group Signature Schemes for Large Groups (Extended Abstract)
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
On the Risk of Disruption in Several Multiparty Signature Schemes
ASIACRYPT '96 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
How to Convert any Digital Signature Scheme into a Group Signature Scheme
Proceedings of the 5th International Workshop on Security Protocols
Group-Oriented Undeniable Signature Schemes without the Assistance of a Mutually Trusted Party
ASIACRYPT '92 Proceedings of the Workshop on the Theory and Application of Cryptographic Techniques: Advances in Cryptology
Robust threshold DSS signatures
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
Efficient and generalized group signatures
EUROCRYPT'97 Proceedings of the 16th annual international conference on Theory and application of cryptographic techniques
On the efficiency of group signatures providing information-theoretic anonymity
EUROCRYPT'95 Proceedings of the 14th annual international conference on Theory and application of cryptographic techniques
A Fully Distributed Proactively Secure Threshold-Multisignature Scheme
IEEE Transactions on Parallel and Distributed Systems
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A (t, n) threshold group signature scheme is a generalization of group signature, in which only t or more members from a given group with n members can represent the group to generate signatures anonymously and the identities of signers of a signature can be revealed in case of dispute later. In this paper, we first present a definition of threshold group signatures, and propose severalreq uirements to evaluate whether a threshold group signature scheme is secure and efficient. Then we investigate the security and efficiency of a threshold group signature scheme proposed by Li, Hwang, Lee and Tsai, and point out eight weaknesses in their scheme. The most serious weakness is that there is a framing attack on their scheme. In this framing attack, once the group private key is controlled, (n - t + 1) colluding group members can forge a valid threshold group signature on any given message, which looks as if it was signed by (t-1) honest group members and one cheating member. At the same time, all these (t - 1) honest members cannot detect this cheating behavior, because they can use the system to generate group signatures normally.