%0 Report
%1 elahmad2011robustness
%A El Ahmad, Ahmad S
%A Yan, Jeff
%A Tayara, Mohamad
%D 2011
%K captcha character google image ocr recognition segmentation
%T The Robustness of Google CAPTCHAs
%U http://homepages.cs.ncl.ac.uk/jeff.yan/google.pdf
%X 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.