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SP
2010
IEEE
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13 years 7 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...
CHI
2009
ACM
14 years 4 months ago
Evaluating existing audio CAPTCHAs and an interface optimized for non-visual use
Audio CAPTCHAs were introduced as an accessible alternative for those unable to use the more common visual CAPTCHAs, but anecdotal accounts have suggested that they may be more di...
Jeffrey P. Bigham, Anna Cavender