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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:
4.
5.
Inventor Luis
von Ahn ( 1978 - ) Photograph by Mike McGregor
6.
7.
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Other :
Mathematical CAPTCHA
21.
Other :
Mathematical CAPTCHA
22.
23.
Other: Jumble Game
24.
Other: Drupal
Examples
25.
26.
27.
28.
29.
30.
31.
32.
Guidelines: Accesibility
Hard to read CAPTCHAs:
33.
Guidelines: Accesibility
Worst CAPTCHAs:
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36.
37.
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39.
Attacks –
SimpleOCR Engine 2002
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Porn Companies (October
2007)
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reCAPTCHA
51.
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54.
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56.
57.
58.
59.
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
60.
61.
http://gwap.com/gwap/
62.
http://gwap.com/gwap/ ESP
Tag a Tune Matchin
63.
http://gwap.com/gwap/ Squigl
Verbosity
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