Efficient and Secure Member Deletion in Group Signature Schemes
ICISC '00 Proceedings of the Third International Conference on Information Security and Cryptology
A Forward-Secure Digital Signature Scheme
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in 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
Statistical Zero Knowledge Protocols to Prove Modular Polynomial Relations
CRYPTO '97 Proceedings of the 17th 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
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
Some Open Issues and New Directions in Group Signatures
FC '99 Proceedings of the Third International Conference on Financial Cryptography
Efficient Revocation in Group Signatures
PKC '01 Proceedings of the 4th International Workshop on Practice and Theory in Public Key Cryptography: Public Key Cryptography
A Practical and Provably Secure Coalition-Resistant Group Signature Scheme
CRYPTO '00 Proceedings of the 20th Annual International Cryptology Conference on Advances in Cryptology
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
On fair e-cash systems based on group signature schemes
ACISP'03 Proceedings of the 8th Australasian conference on Information security and privacy
Quasi-efficient revocation of group signatures
FC'02 Proceedings of the 6th international conference on Financial cryptography
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Extracting group signatures from traitor tracing schemes
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
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As a special digital signature, a group signature scheme allows a group member to sign message on behalf of the group in an anonymous and unlinkability way, In case of a dispute, a designated group manager can reveal the actual identity of the signer. Anonymity and unlinkability are basic properties of group signature, which distinguish other signature schemes. Recently, based on a variant of Nyberg-Rueppel signature and knowledge proof signature, A.Miyaji et al proposed a new group signature scheme over only known-order group and claimed that the scheme is secure. Unfortunately, in this work we first show that the scheme has linkability, Namely, any one can distinguish whether two different group signatures are produced by the same signer, then give the corresponding attack on the scheme. Finally, we propose an improved scheme to overcome the above drawback:linkability and include a novel concept:individual revocation of signatures. At the same time, we give the security analysis of the improved scheme.