Untraceable off-line cash in wallet with observers
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Atomicity in electronic commerce
PODC '96 Proceedings of the fifteenth annual ACM symposium on Principles of distributed computing
Execution Guarantees in Electronic Commerce Payments
Selected papers from the Eight International Workshop on Foundations of Models and Languages for Data and Objects, Transactions and Database Dynamics
Money Conservation via Atomicity in Fair Off-Line E-Cash
ISW '99 Proceedings of the Second International Workshop on Information Security
Ripping coins for a fair exchange
EUROCRYPT'95 Proceedings of the 14th annual international conference on Theory and application of cryptographic techniques
Anonymous payment in a fair e-commerce protocol with verifiable TTP
TrustBus'05 Proceedings of the Second international conference on Trust, Privacy, and Security in Digital Business
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An electronic purchase is an essential operation of electronic commerce Fairness in the exchange of money and product, as well as anonymity of the buyer, are desirable features In Asiacrypt 2003, C.H Wang [8] presented a purchase protocol satisfying both anonymity and fairness, adapting the anonymous payment system of Brands [2], using a restrictive confirmation signature scheme Later, In Asiacrypt 2004, Feng Bao [1] demonstrated that Wang's protocol [8] can be vulnerable to attacks produced by colluding users, and he affirmed that the protocol cannot be corrected due to the anonymity of the protocol We will show that it is possible to correct Wang's protocol in order to avoid colluding attacks We present a solution that modifies slightly the original protocol, maintaining the anonymity and untraceability of the original version Finally, we discuss the convenience to achieve the property of timeliness.