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The Robustness of Google CAPTCHAs

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The Robustness of Google CAPTCHAs. / El Ahmad, A.S.; Yan, Jeff; Tayara, Mohamad.
Newcastle Upon Tyne: Newcastle University School of Computing Science, 2011. 15 p. (School of Computing Science Technical Report Series ).

Research output: Book/Report/ProceedingsOther report

Harvard

El Ahmad, AS, Yan, J & Tayara, M 2011, The Robustness of Google CAPTCHAs. School of Computing Science Technical Report Series , Newcastle University School of Computing Science, Newcastle Upon Tyne. <http://www.cs.ncl.ac.uk/publications/trs/papers/1278.pdf>

APA

El Ahmad, A. S., Yan, J., & Tayara, M. (2011). The Robustness of Google CAPTCHAs. (School of Computing Science Technical Report Series ). Newcastle University School of Computing Science. http://www.cs.ncl.ac.uk/publications/trs/papers/1278.pdf

Vancouver

El Ahmad AS, Yan J, Tayara M. The Robustness of Google CAPTCHAs. Newcastle Upon Tyne: Newcastle University School of Computing Science, 2011. 15 p. (School of Computing Science Technical Report Series ).

Author

El Ahmad, A.S. ; Yan, Jeff ; Tayara, Mohamad. / The Robustness of Google CAPTCHAs. Newcastle Upon Tyne : Newcastle University School of Computing Science, 2011. 15 p. (School of Computing Science Technical Report Series ).

Bibtex

@book{83273f13a5fb40ce87b30fb8d643cc08,
title = "The Robustness of Google CAPTCHAs",
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.",
keywords = "captcha, robustness, segmentation attack",
author = "{El Ahmad}, A.S. and Jeff Yan and Mohamad Tayara",
year = "2011",
month = sep,
language = "English",
series = "School of Computing Science Technical Report Series ",
publisher = "Newcastle University School of Computing Science",

}

RIS

TY - BOOK

T1 - The Robustness of Google CAPTCHAs

AU - El Ahmad, A.S.

AU - Yan, Jeff

AU - Tayara, Mohamad

PY - 2011/9

Y1 - 2011/9

N2 - 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.

AB - 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.

KW - captcha

KW - robustness

KW - segmentation attack

M3 - Other report

T3 - School of Computing Science Technical Report Series

BT - The Robustness of Google CAPTCHAs

PB - Newcastle University School of Computing Science

CY - Newcastle Upon Tyne

ER -