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The idea of electronic cash, as a payment instrument is appealing, but has yet to be widely deployed commercially. We outline the properties of two major approaches to the provision of electronic cash, and discuss their strengths and weaknesses. We then propose a new scheme based on secret splitting that allows for off-line spending of coins with a tailored(More)
As business is moving from face-to-face trading, mail order, and telephone order to electronic commerce over open networks such as the Internet, crucial security issues are being raised. Whereas Electronic Funds Transfer over financial networks is reasonably secure, securing payments over open networks connecting commercial servers and consumer workstations(More)
Declaration I declare that the work described in this dissertation is, except where otherwise stated, entirely my own work and has not been submitted as an exercise for a degree at this or any other university. I agree that Trinity College Library may lend or copy this dissertation upon request. iii Acknowledgements I would like to thank my supervisor, Mr.(More)
The past few years have witnessed an explosive growth in the use of wireless mobile handheld devices as the enabling technology for accessing Internet-based services, as well as for personal communication needs in ad hoc networking environments. Most studies indicate that it is impossible to utilize strong cryptographic functions for implementing security(More)
The dynamic nature of Ad hoc Networks makes it difficult to build trust relationships. This is primarily due to non-availability of online trusted third parties during trust negotiation. Trust Negotiations should also be secure and straightforward. This paper presents an overview of a scheme for progressive trust negotiation to build trust, along with a(More)
In this paper we address the problem of trust formation and secure communications in ad-hoc networks. The dynamic nature and frequent membership changes make it difficult to form trust relationships in ad hoc networks. We intend to build such relationships by progressive exchange of certificates and the resulting trust may be complete or partial in nature.(More)