How to prove yourself: practical solutions to identification and signature problems
Proceedings on Advances in cryptology---CRYPTO '86
Zero-knowledge undeniable signatures (extended abstract)
EUROCRYPT '90 Proceedings of the workshop on the theory and application of cryptographic techniques on Advances in cryptology
CRYPTO '89 Proceedings on Advances in cryptology
On blind signatures and perfect crimes
Computers and Security
Digital payment systems with passive anonymity-revoking trustees
Journal of Computer Security
Fair Electronic Cash Based on a Group Signature Scheme
ICICS '01 Proceedings of the Third International Conference on Information and Communications Security
Efficient Group Signature Schemes for Large Groups (Extended Abstract)
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
A New Offline Privacy Protecting E-cash System with Revokable Anonymity
ISC '02 Proceedings of the 5th International Conference on Information Security
Group Blind Digital Signatures: A Scalable Solution to Electronic Cash
FC '98 Proceedings of the Second International Conference on Financial Cryptography
On fair e-cash systems based on group signature schemes
ACISP'03 Proceedings of the 8th Australasian conference on Information security and privacy
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One important requirement of electronic cash systems is the anonymity of customers. Unconditional anonymity is also very well suited to support criminals in blackmailing. Maitland and Boyd proposed at ICICS 2001 an offline electronic cash system based on a group signature scheme. Their scheme cannot be used to solve blackmailing and other anonymity problems such as money laundering and illegal purchases. Chen, Zhang and Wang suggested an offline electronic cash scheme to prevent blackmailing by using the group blind signature. In their payment system, they used a group signature scheme of Camenisch and Stadler for large groups which is not secure. In this paper we improve these electronic cash systems to prevent blackmailing, money laundering and illegal purchases by using a secure coalition-resistant group blind signature scheme.