Stephen K. Barton

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This paper addresses the problem of selecting the optimum training sequence for channel estimation in communication systems over time-dispersive channels. By processing in the frequency domain, a new explicit form of search criterion is found, the gain loss factor (GLF), which minimizes the variance of the estimation error and is easy to compute.(More)
Communication by e-mail has become a vital part of everyday business and has replaced most of the conventional ways of communicating. Important business correspondence may require certified e-mail delivery, analogous to that provided by conventional mail service. This paper presents a novel certified e-mail delivery protocol that provides non-repudiation of(More)
This paper presents a novel protocol for fair exchange of DSA-based signatures to support an e-commerce activity of digital contract signing. The protocol employs an off-line semi-trusted third party (STTP), which participates in the protocol execution only in exceptional circumstances and which involvement in the protocol is transparent. The protocol can(More)
This paper presents an efficient security protocol for certified e-goods delivery with the following features: (1) ensures strong fairness, (2) ensures non-repudiation of origin and non-repudiation of receipt, (3) allows the receiver of an e-goods to verify, during the protocol execution, that the e-goods he is about to receive is the one he is signing the(More)