Untraceable off-line cash in wallet with observers
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Improved privacy in wallets with observers
EUROCRYPT '93 Workshop on the theory and application of cryptographic techniques on Advances in cryptology
Proceedings of the tenth annual ACM-SIAM symposium on Discrete algorithms
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
Fair Electronic Cash Based on a Group Signature Scheme
ICICS '01 Proceedings of the Third International Conference on Information and Communications Security
Wallet Databases with Observers
CRYPTO '92 Proceedings of the 12th 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
Some Open Issues and New Directions in Group Signatures
FC '99 Proceedings of the Third International Conference on Financial Cryptography
Unlinkable Divisible Electronic Cash
ISW '00 Proceedings of the Third International Workshop on Information Security
A Practical and Provably Secure Coalition-Resistant Group Signature Scheme
CRYPTO '00 Proceedings of the 20th Annual International Cryptology Conference on Advances in Cryptology
Group Blind Digital Signatures: A Scalable Solution to Electronic Cash
FC '98 Proceedings of the Second International Conference on Financial Cryptography
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
Group signatures are suitable for constrained devices
ICISC'10 Proceedings of the 13th international conference on Information security and cryptology
Off-Line group signatures with smart cards
CARDIS'06 Proceedings of the 7th IFIP WG 8.8/11.2 international conference on Smart Card Research and Advanced Applications
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Group signatures and their applications have received considerable attention in the literature in recent times. Substantial gains have been made with respect to designing provably secure and efficient schemes. In practice, as with all signature schemes, deploying group signature schemes requires the group member's signing keys to be both physically and electronically secure from theft. Smartcards or similar devices are often offered as a solution to this problem.We consider the possibility of co-operatively forming group signatures so as to balance the processing load between a modestly performed secure device and a much more powerful workstation. The constructions are based on the observation that several recent group signature schemes have adopted a structure which utilises two values in signature creation - a private signing key and a group membership certificate. We describe a co-operative group signature scheme based on a recently proposed scheme as well as a 'wallet with observer' variant.