| Author | Title | Year | Journal/Proceedings | Reftype | DOI/URL |
|---|---|---|---|---|---|
| El Ahmad, A. S., Yan, J. & Tayara, M. | The Robustness of Google CAPTCHAs | 2011 | techreport | URL | |
| Abstract: We report a novel attack on two CAPTCHAs that have been widely deployed on the Internet, one being Google's home design and the other acquired by Google (i.e. reCAPTCHA). With a minor change, our attack program also works well on the latest ReCAPTCHA version, which uses a new defence mechanism that was unknown to us when we designed our attack. This suggests that our attack works in a fundamental level. Our attack appears to be applicable to a whole family of text CAPTCHAs that build on top of the popular segmentation-resistant mechanism of "crowding character together" for security. Next, we propose a novel framework that guides the application of our well-tested security engineering methodology for evaluating CAPTCHA robustness, and we propose a new general principle for CAPTCHA design. | |||||
BibTeX:
@techreport{elahmad2011robustness,
author = {El Ahmad, Ahmad S and Yan, Jeff and Tayara, Mohamad},
title = {The Robustness of Google CAPTCHAs},
year = {2011},
url = {http://homepages.cs.ncl.ac.uk/jeff.yan/google.pdf}
}
|
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