1. Mrs. Beth Cueni Carnegie Mellon
CAPTCHA
Mrs. Beth Cueni
Carnegie Mellon

2. CAPTCHA
Stands for Completely Automated Public Turing test to tell Computers and Humans Apart."

3. Who and Why Coined in 2000 Luis von Ahn (Carnegie Mellon)
Manual Blum (Carnegie Mellon)
Nicholas J. Hopper (Carnegie Mellon)
John Langford (IBM)
To stop spammers

4. Question posed
Which is the best Computer Science Graduate School in the US?

5. Where are they used?
To stop automated postings to blogs, forums, wikis
Sorry, no example!

6. To purchase tickets

7. To create email accounts

8. ReCAPTCHA that uses CAPTCHA to help digitize the text of books
reCAPTCHA is currently digitizing the archives of the New York Times
Twenty years of The New York Times have been digitized and the project hopes to have the 110 other years done by

9. ReCAPTCHA 200 million CAPTCHA’s per day
10 sec of human time per CAPTCHA
400,000,000 or 6% of the world’s population has helped to digitize books

10. ReCAPTUCHA
reCAPTCHA supplies subscribing websites with images of words that OCR – optical character recognition software has been unable to read.
The subscribing websites (whose purposes are generally unrelated to the book digitization project) present these images for humans to decipher as CAPTCHA words, as part of their normal validation procedures.
They then return the results to the reCAPTCHA service, which sends the results to the digitization projects.
This provides about the equivalent of 160 books per day, or 12,000 man-hours per day of free labor (as of September 2008

11. Two words
Typing 2 English words takes as long as typing 6-8 random characters
One word the computer knows
Second word is given to many people
Chances are, if they match one word, they’ll match the other word

12. Reusing Wasted Cycles How people spend their time Electronic Games
9 billion human hours of Solitaire played in 2003
Building the Empire State building – 7 million human-hours
Panama Canal – 20 million human hours

13. GWAP GWAP – Games with a purpose ESP Game 2 player online game
Object of the game – type the same word for the given image
Taboo words
2 ½ minutes to label 15 images

14. ESP Guesses change over time Partner Britney Spears
Hot, crazy, rehab, shaved head
Partner
Love or hate their partner based on responses

15. Audio ESP game Tag-a-tune See responses
But you may or may not be listening to the same clip

16. Wasted Time Survey Learning something new Learning a foreign language
Why? To help translate Wikipedia to different languages
MONOLINGO – release date Oct 16th