A fair network payment protocol plays an important role in electronic commerce. The fairness concept in payments can be illustrated as that two parties (e.g. customers and merchants) exchange the electronic items (e.g. electronic money and goods) with each other in a fair manner that no one can gain advantage over the other even if there are malicious actions during exchanging process. In the p...

With the development of information technology, electronic data exchange to some extent takes the place of the traditional transaction based on paper contract, which challenged the legal system and the information security system while facilitating the transaction. This paper studied the typical procedures of signing e-commerce contract, found that there are some problems on legal and operation...

We present a series of protocols for authenticating an in-dividual's membership in a group without revealing that individual's identity and without restricting how the membership of the group may be changed. In systems using these protocols a single message to the authenticator may be used by an individual to replace her lost key or by a trusted third party to add and remove members of the grou...

The explosive growth of the Internet exposes unprecedented commercial opportunities over the network. The vast comptiter networks easily bring together customers and vendors who are physically distributed in diflerent continents. Current research in electronic commerce mainly focuses on payment mechanisms. However, the global presence of customers and vendors makes at dificult to build trust am...

Fair exchange between mutually distrusted parties has been recognized as an important issue in electronic commerce. Ž . Ž . However, the correctness fairness of the existing fair exchange protocols that use a Trusted Third Party TTP is based on the assumption that during an exchange there are no failures at any of the local systems involved in the exchange, which is Ž . Ž . too strong in many s...

Model is a kind of codified knowledge that has been verified in solving problems. Solving a complex problem usually needs a set of models. Using components, the composition of a set of closely related models, could enhance the efficiency of solving problems as components are experience in form of knowledge network. Mappings between components vary with the relevancy of problems. Such mappings c...

Fairness is an important property of secure electronic commerce. Most of E-payment protocols guarantee fairness by using a Trusted Third Party (TTP) or semi-trusted third party. There are few protocols without a trusted third party. Based on concurrent signature, we propose two protocols suitable for digital products transaction, one for mobile payment and the other for the transaction which ha...

A major problem facing the full deployment of business-to-consumer (B2C) e-commerce is the development of trust on the side of the consumer. People develop trust in a business through their own previous experience with that business or through reports about that business from trusted third parties or other consumers. While a great deal of effort has been spent on privacy and secure transactions...

Electronic commerce (e-commerce) is a relatively new, emerging and constantly changing area of business management and information technology. One of the technological innovations in banking, finance and e-commerce is the electronic cash (e-cash) transfer system. E-cash transfer systems refers to the technological breakthrough that enables us to perform financial transactions electronically. In...

Contract signing is a fundamental service in doing business. The Internet has facilitated the electronic commerce, and it is necessary to find appropriate mechanisms for contract signing in the digital world. A number of two-party contract signing protocols have been proposed with various features. Nevertheless, in some applications, a contract may need to be signed by multiple parties. Less re...