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CAPTCHA security: a case study

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<mark>Journal publication date</mark>07/2009
<mark>Journal</mark>IEEE Security and Privacy Magazine
Issue number4
Volume7
Number of pages7
Pages (from-to)22-28
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A simple but novel attack can break some CAPTCHAs with a success rate higher than 90 percent. In contrast to early work that relied on sophisticated computer vision or machine learning techniques, the authors used simple pattern recognition algorithms to exploit fatal design errors.