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» How Good Are Humans at Solving CAPTCHAs
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SP
2010
IEEE
192views Security Privacy» more  SP 2010»
13 years 8 months ago
How Good Are Humans at Solving CAPTCHAs? A Large Scale Evaluation
—Captchas are designed to be easy for humans but hard for machines. However, most recent research has focused only on making them hard for machines. In this paper, we present wha...
Elie Bursztein, Steven Bethard, Celine Fabry, John...
SICHERHEIT
2010
13 years 2 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 ...
Paul Baecher, Marc Fischlin, Lior Gordon, Robert L...
SOUPS
2009
ACM
13 years 11 months ago
Machine learning attacks against the Asirra CAPTCHA
The ASIRRA CAPTCHA [6], recently proposed at ACM CCS 2007, relies on the problem of distinguishing images of cats and dogs (a task that humans are very good at). The security of AS...
Philippe Golle
AAAI
2008
13 years 6 months ago
Unknown Rewards in Finite-Horizon Domains
"Human computation" is a recent approach that extracts information from large numbers of Web users. reCAPTCHA is a human computation project that improves the process of...
Colin McMillen, Manuela M. Veloso
ITS
2010
Springer
149views Multimedia» more  ITS 2010»
13 years 6 months ago
How Adaptive Is an Expert Human Tutor?
In examine the tutoring protocols of one expert human tutor tutoring 10 students in solving physics problems, four analyses reveal that he tutored the five good learners in differe...
Michelene T. H. Chi, Marguerite Roy