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SICHERHEIT
2010

CAPTCHAs: The Good, the Bad, and the Ugly

9 years 4 months ago
CAPTCHAs: The Good, the Bad, and the Ugly
A CAPTCHA is a program that generates challenges that are easy to solve for humans but difficult to solve for computers. The most common CAPTCHAs today are text-based ones where a short word is embedded in a cluttered image. In this paper, we survey the state-of-the-art of currently deployed CAPTCHAs, especially of some popular German sites. Surprisingly, despite their importance and the largescale deployment, most of the CAPTCHAs like the ones of the "Umweltpr
Paul Baecher, Marc Fischlin, Lior Gordon, Robert L
Added 15 Feb 2011
Updated 15 Feb 2011
Type Journal
Year 2010
Where SICHERHEIT
Authors Paul Baecher, Marc Fischlin, Lior Gordon, Robert Langenberg, Michael Lützow, Dominique Schröder
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