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… (More)
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Topic mentions per year

Topic mentions per year

1975-2017
05010019752017

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… (More)
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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… (More)
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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… (More)
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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… (More)
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Highly Cited
2008
Highly Cited
2008
The Asirra CAPTCHA [EDHS2007], proposed at ACM CCS 2007, relies on the problem of distinguishing images of cats and dogs (a task… (More)
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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… (More)
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Highly Cited
2007
Highly Cited
2007
Visual CAPTCHAs have been widely used across the Internet to defend against undesirable or malicious bot programs. In this paper… (More)
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Highly Cited
2004
Highly Cited
2004
This paper describes two distortion estimation techniques for object recognition that solve EZ-Gimpy and Gimpy-r, two of the… (More)
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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 EZGimpy, examples… (More)
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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… (More)
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