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—Web bots, such as XRumer, Magic Submitter and SENuke, have been widely used by attackers to perform illicit activities, such as massively registering accounts, sending spam, and automating web-based games. Although the technique of CAPTCHA has been widely used to defend against web bots, it requires users to solve some explicit challenges, which is(More)
This thesis develops new software to help distinguish schizophrenic speech from healthy speech. I used the Natural Language Analysis Tools (Covington 2002) and developed the Natural Language Feature Extraction program to collect linguistic features from forty four speech samples. Decision trees and neural networks use these linguistic features to classify(More)
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