A Fair Exchange & Customer Anonymity Protocol Using A Trusted Third Party for Electronic Commerce Transactions & Payments

Fair Exchange with a Semi-Trusted Third Party

We present new protocols for two parties to exchange documents with fairness, i.e., such that no party can gain an advantage by quitting prematurely or otherwise misbehaving. We use a third party that is L‘semi-trusted”, in the sense that it may misbehave on its own but will not conspire with either of the main parties. In our solutions, disruption by any one of the three parties will not allow...

A Fair-Exchange Protocol Based on Off-line Semi-Trusted Third Party

The fairness of data exchange becomes a key factor for the transaction over the Internet. To ensure the fairness of data exchange, the protocol needs a trusted third party be a judge when the dispute occurs, and has to give a guarantee to main parties during the data exchange. To eliminate the third party’s connectional time and enhance its security, a fair-exchange protocol based on off-line s...

Design and evaluate a fair exchange protocol based on online trusted third party (TTP)

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Fair Exchange of Short Signatures without Trusted Third Party

We propose a protocol to exchange Boneh-Boyen short signatures in a fair way, without relying on a trusted third party. Our protocol is quite practical and is the first of the sort to the best of our knowledge. Our construction uses a new non-interactive zero-knowledge (NIZK) argument to prove that a commitment is the encryption of a bit vector. We also design a NIZK argument to prove that a co...

Achieving fair exchange and customer anonymity for online products in electronic commerce