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Captcha
1.
Are you Human?
(Sorry, I had to ask) Ecaterina Valică http://students.info.uaic.ro/~evalica/
2.
3.
Example: Filling out
a form Google uses CAPTCHA for Gmail accounts:
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5.
Inventor Luis
von Ahn ( 1978 - ) Photograph by Mike McGregor
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Other :
Mathematical CAPTCHA
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Other :
Mathematical CAPTCHA
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Other: Jumble Game
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Other: Drupal
Examples
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Guidelines: Accesibility
Hard to read CAPTCHAs:
33.
Guidelines: Accesibility
Worst CAPTCHAs:
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Attacks –
SimpleOCR Engine 2002
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Porn Companies (October
2007)
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reCAPTCHA
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The ESP Game
Player 1 Guessing: CAR Guessing : HAT Guessing: KID Success! You agree on CAR Player 2 Guessing : BOY Guessing : CAR Success! You agree on CAR
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http://gwap.com/gwap/
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