Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"CAPTCHA"”.
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POSH : a generalized CAPTCHA with security applications
A puzzle only solvable by humans, or POSH, is a prompt or question with three important properties: it can be generated by a computer, it can be answered consistently by a human, and a human answer cannot be efficiently predicted by a computer. In fact, a POSH does not necessarily have to be …
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Breaking the multi colored box: a study of CAPTCHA
… Turing Tests to Tell Computers and Humans Apart (CAPTCHA), a challenge/response technique where an image is displayed with text that is heavily distorted. It also examines the feasibility of breaking CAPTCHA programmatically, alternatives to CAPTCHA based on filtering, improvements to CAPTCHA …
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Security and usability of cross-device captchas
Captcha tests have been widely used to deter the misuse of services on the Internet. The most commonly used Captcha schemes are text-based. However, many Captcha schemes suffer from inadequacies in terms of aspects of security and usability, and indeed the balance between them. That is, many …
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Multi-character prediction using attention
… detection tasks—multi-digit classification and CAPTCHA unlocking—using the publicly available Street View House Numbers (SVHN) dataset and a custom CAPTCHA dataset. The experiments confirm our hypothesis that the network learns to attend to relevant features by minimizing the loss between the …
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Non-intrusive vibration monitoring in US Naval and US Coast Guard ships
… this thesis takes the LEES lab-designed CAPTCHA accelerometers to the US Navy and US Coast Guard fleets to test the lab-designed tool, collect ship equipment data, and verify the VAMPIRE concepts. The CAPTCHA's ability to monitor the vibrations of these systems could be used to …
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Clustering Web Users by Mouse Movement to Detect Bots and Botnet Attacks
… with human interactive proofs (HIP) such as CAPTCHA, or with login requirements</p>
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A Security Framework for Preventing Denial of Service and Economic Denial of Sustainability Attacks in the Cloud Computing Environment
In the cloud computing era, security has become a renewed source of concerns. Distributed Denial of Service (DDoS) that affects network availability and Economic Denial of Sustainability (EDoS) that can harm the pay-per-use model, which is one of the most valuable benefits of the cloud, can again …
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Cerebral palsy, online social networks and change
… requiring JavaScript, hard-coded text size and Captcha (AbilityNet, 2008; Cahill and Hollier, 2009 andAsuncion, 2010) access to OSNs is often difficult. The overarching purpose of this PhD research is to understand the experiences and challenges faced when people with the physical disability …