Witness indistinguishable and witness hiding protocols
STOC '90 Proceedings of the twenty-second annual ACM symposium on Theory of computing
Zero-knowledge undeniable signatures (extended abstract)
EUROCRYPT '90 Proceedings of the workshop on the theory and application of cryptographic techniques on Advances in cryptology
On blind signatures and perfect crimes
Computers and Security
Revokable and versatile electronic money (extended abstract)
CCS '96 Proceedings of the 3rd ACM conference on Computer and communications security
The risks of key recovery, key escrow, and trusted third-party encryption
World Wide Web Journal - Special issue: Web security: a matter of trust
Digital Payment Systems with Passive Anonymity-Revoking Trustees
ESORICS '96 Proceedings of the 4th European Symposium on Research in Computer Security: Computer Security
Provably Secure and Practical Identification Schemes and Corresponding Signature Schemes
CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
RSA-Based Undeniable Signatures
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
"Indirect Discourse Proof": Achieving Efficient Fair Off-Line E-cash
ASIACRYPT '96 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
Provably Secure Blind Signature Schemes
ASIACRYPT '96 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
Anonymity Control in E-Cash Systems
FC '97 Proceedings of the First International Conference on Financial Cryptography
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
Designated verifier proofs and their applications
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
Distributed "magic ink" signatures
EUROCRYPT'97 Proceedings of the 16th annual international conference on Theory and application of cryptographic techniques
FC '01 Proceedings of the 5th International Conference on Financial Cryptography
A Practical Approach Defeating Blackmailing
ACISP '02 Proceedings of the 7th Australian Conference on Information Security and Privacy
Fair tracing without trustees for multiple banks
CIS'04 Proceedings of the First international conference on Computational and Information Science
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Electronic payment systems based on anonymous coins have been invented as a digital equivalent to physical banknotes. However, von Solms and Naccache discovered that such anonymous coins are also very well suited to support criminals in blackmailing. In this paper we present a payment system, which has an efficient tracing and revocation mechanism for blackmailed coins. The used tracing method is based on the idea of marking coins similar to marking banknotes with an invisible color. In contrast to previous solutions our payment system is unconditionally anonymous and thus protects the privacy of the users.