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Development of two novel face-recognition CAPTCHAs: A security and usability study

Schryen, Guido ; Wagner, Gerit ; Schlegel, Alexander


CAPTCHAs are challenge-response tests that aim at preventing unwanted machines, including bots, from accessing web services while providing easy access for humans. Recent advances in artificial-intelligence based attacks show that the level of security provided by many state-of-the-art text-based CAPTCHAs is declining. At the same time, techniques for distorting and obscuring the text, which are ...


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