The fair exchange problem is key to trading electronic items in systems of mutually untrusted parties. We consider modern variants of such systems where each party is equipped with a tamper proof security module. The security modules trust each other but can only communicate by exchanging messages through their host parties. These are untrusted and could intercept and drop those messages. We sh...

Recently, research has focused on enabling fair exchange between payment and electronically shipped items. The reason for this is the growing importance of Electronic Commerce and the increasing number of applications in this area. Although a considerable number of fair exchange protocols exist, they usually have been defined for special scenarios and thus only work under particular assumptions...

The fair exchange problem is key to trading electronic items in systems of mutually untrusted parties. In modern variants of such systems, each party is equipped with a security module. The security modules trust each other but can only communicate by exchanging messages through their untrusted host parties, that could drop those messages. We describe a synchronous algorithm that ensures determ...

P2P is a promising technology to construct the underlying supporting layer of a Grid. It is known that contribution from all the peers is vital for the sustainability of a P2P community, but peers are often selfish and unwilling to contribute. In this paper we describe how to construct a fair file-exchanging P2P community. We name this community a P2P file market. Our scheme forces peers to con...

Of late online social networks have become popular, with interest spanning various aspects including search, analysis/mining, and their potential use for item barter exchange markets. The idea is that users can leverage their social network for exchanging items they possess with other users. The problem of generating recommendations for item exchanges between users, consisting of synchronous ex...

This paper presents an efficient fair document exchange protocol. The exchange of the documents will be between two parties. The protocol is based on the verifiable and recoverable encryption of a document’s key. This verifiable and recoverable encryption of the document’s key will allow one party to verify the encrypted key. It will also ensure this party that the Semi Trusted Third Party will...

A fair exchange of payments for goods and services is a barter where one of the parties cannot obtain the item desired without handing over the item he ooered. We introduce the concept of ripping digital coins to solve fairness problems in payment transactions. We demonstrate how to implement coin ripping for a recently proposed payment scheme 9, 8], giving a practical and transparent coin ripp...