Group Signatures and Their Relevance to Privacy-Protecting Off-Line Electronic Cash Systems
ACISP '99 Proceedings of the 4th Australasian Conference on Information Security and Privacy
Cryptoanalysis in Prime Order Subgroups of Z*n
ASIACRYPT '98 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
A Group Signature Scheme with Improved Efficiency
ASIACRYPT '98 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
Group Blind Digital Signatures: A Scalable Solution to Electronic Cash
FC '98 Proceedings of the Second International Conference on Financial Cryptography
An Efficient Off-line Electronic Cash System Based On The Representation Problem.
An Efficient Off-line Electronic Cash System Based On The Representation Problem.
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
Non-interactive public-key cryptography
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
Group signature where group manager, members and open authority are identity-based
ACISP'05 Proceedings of the 10th Australasian conference on Information Security and Privacy
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Group signature schemes allow a group member to anonymously sign on group's behalf. Moreover, in case of anonymity misuse, a group authority can recover the issuer of a signature. This paper analyzes the security of two group signature schemes recently proposed by Tseng and Jan. We show that both schemes are universally forgeable, that is, anyone (not necessarily a group member) is able to produce a valid group signature on an arbitrary message, which cannot be traced by the group authority.