Abstract:
I hereby declare that I am the sole author of this thesis. I authorize the University of Waterloo to lend this thesis to other institutions or individuals for the purpose of scholarly research. I further authorize the University of Waterloo to reproduce this thesis by photocopying or by other means, in total or in part, at the request of other institutions or individuals for the purpose of scholarly research. ii The University of Waterloo requires the signatures of all persons using or photocopying this thesis. Please sign below, and give address and date. iii Commerce over open networks like the Internet, sometimes referred to as electronic commerce, is becoming more widespread. This makes it important to study, and solve the security problems associated with electronic commerce. There are three prominent characteristics of commerce which are relevant in this respect. First, the crux of a commercial
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