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Title: Enforcing honesty in e-commerce fair exchange protocols
Author: Alaraj, Abdullah M. S.
ISNI:       0000 0001 3409 8286
Awarding Body: Durham University
Current Institution: Durham University
Date of Award: 2008
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The growth of the Internet attracted many users either as merchants or customers. Merchants have products and services to sell whereas customers have money to pay for these products and services. Customers normally do not trust merchants and also merchants do not trust customers. When a customer is willing to buy any product or service, they want be sure that the merchant will send them the product that they want after they make the correct payment. Similarly, a merchant will not take the risk by sending the product before the customer makes the correct payment. Therefore, the party (customer or merchant) who send their item (payment or product) first will be at risk of the misbehaviour of the other party. This problem is known as the fairness problem. The aim is to study the existing fair exchange protocols that solve the fairness problem. Then, propose more efficient protocols to solve the fairness problem. The original idea in this thesis is enforcing honesty in fair exchange protocols. The idea of enforcing honesty is applied to produce a fair exchange protocol that encourages the merchant to be honest and enforces the customer to be honest and vice versa. The thesis shows that it is not possible to enforce both the customer and the merchant to be honest at the same time. Hence, it proposes a third fair exchange protocol that encourages the customer and the merchant to be honest. The protocols make use of a Trusted Third Party (TIP) but its use is kept to minimum when disputes arise. In this respect they are optimistic fair exchange protocols. The proposed protocols have the following features: (1) only three messages are required to be exchanged between a customer and a merchant that apply the idea of enforcing a party to be honest; (2) the protocols guarantee strong fairness for both customer and merchant; (3) they allow both parties (customer and merchant) to check the correctness of the item of the other party before they send their item; (4) disputes are resolved automatically online by a Trusted Third Party (TIP); and (5) they are efficient in that they have a low number of modular exponentiations (which is the most expensive operation). Applying the idea of enforcing a party to be honest has helped in proposing efficient (air exchange protocols for the exchange of payments and digital products between customers and merchants.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available