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Captcha robustness: a security engineering perspective

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Article number5601666
<mark>Journal publication date</mark>02/2011
<mark>Journal</mark>Computer
Issue number2
Volume44
Number of pages7
Pages (from-to)54-60
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Captchas are a standard defense on commercial websites against undesirable or malicious Internet bot programs, but widely deployed schemes can be broken with simple but novel attacks. Applying security engineering expertise to the design of Captchas can significantly improve their robustness.