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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… 
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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… 
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… 
Highly Cited
2010
Highly Cited
2010
Captchas are designed to be easy for humans but hard for machines. However, most recent research has focused only on making them… 
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… 
Highly Cited
2008
Highly Cited
2008
CAPTCHA is now almost a standard security technology, and has found widespread application in commercial websites. Usability and… 
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… 
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… 
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… 
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… 
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…