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CAPTCHA

Known as: Image Verification, Gausebeck-Levchin test, Completely Automated Public Turing Test to Tell Computers and Humans Apart 
A CAPTCHA (a backronym for "Completely Automated Public Turing test to tell Computers and Humans Apart") is a type of challenge-response test used in… Expand
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Papers overview

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Highly Cited
2011
Highly Cited
2011
We carry out a systematic study of existing visual CAPTCHAs based on distorted characters that are augmented with anti… Expand
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Highly Cited
2010
Highly Cited
2010
Reverse Turing tests, or CAPTCHAs, have become an ubiquitous defense used to protect open Web resources from being exploited at… Expand
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Highly Cited
2009
Highly Cited
2009
We present a new CAPTCHA which is based on identifying an image's upright orientation. This task requires analysis of the often… Expand
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Highly Cited
2008
Highly Cited
2008
CAPTCHA is now almost a standard security technology, and has found widespread application in commercial websites. Usability and… Expand
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Highly Cited
2008
Highly Cited
2008
CAPTCHA is now almost a standard security technology. The most widely deployed CAPTCHAs are text-based schemes, which typically… Expand
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Highly Cited
2008
Highly Cited
2008
  • Philippe Golle
  • ACM Conference on Computer and Communications…
  • 2008
  • Corpus ID: 1987503
A retractable stairs-like stand has rows of seats on moveable floor-bases arranged in a stair-like manner for use in an… Expand
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Highly Cited
2007
Highly Cited
2007
We present Asirra (Figure 1), a CAPTCHA that asks users to identify cats out of a set of 12 photographs of both cats and dogs… Expand
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Highly Cited
2005
Highly Cited
2005
We propose IMAGINATION (IMAge Generation for INternet AuthenticaTION), a system for the generation of attack-resistant, user… Expand
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Highly Cited
2003
Highly Cited
2003
We introduce captcha, an automated test that humans can pass, but current computer programs can't pass: any program that has high… Expand
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Highly Cited
2003
Highly Cited
2003
In this paper we explore object recognition in clutter. We test our object recognition techniques on Gimpy and EZ-Gimpy, examples… Expand
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