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Are you Human? (Sorry, I had to ask) Ecaterina Valică http://students.info.uaic.ro/~evalica/

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example: Filling out a form Google uses CAPTCHA for Gmail accounts:

Beginnings ,[object Object],[object Object],[object Object]

Inventor Luis von Ahn ( 1978 - ) Photograph by Mike McGregor

What is CAPTCHA? ,[object Object],[object Object]

Turing Test ,[object Object],[object Object],[object Object],[object Object]

Reverse Turing Test ,[object Object],[object Object],[object Object]

So, CAPTCHA is… ,[object Object],[object Object],[object Object]

Making a CAPTCHA ,[object Object],[object Object],[object Object],[object Object]

Making a CAPTCHA ,[object Object],[object Object]

Outperform the computers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Type: Early CAPTCHAs ,[object Object],[object Object]

Type: Improved CAPTCHA ,[object Object],[object Object],[object Object],[object Object]

Type: A modern CAPTCHA ,[object Object],[object Object]

Other Types of CAPTCHA ,[object Object],[object Object],[object Object],[object Object]

Other: Cognitive Puzzles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Other: Distinguish pictures ,[object Object],[object Object]

Other: 3D Object CAPTCHA ,[object Object],[object Object],[object Object],[object Object]

Other: Tests ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Where to use CAPTCHAs? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Where to use CAPTCHAs? ,[object Object],[object Object],[object Object]

Guidelines ,[object Object],[object Object],[object Object],[object Object]

Guidelines: Accesibility Hard to read CAPTCHAs:

Guidelines: Accesibility Worst CAPTCHAs:

Ways to break CAPTCHAs ,[object Object],[object Object],[object Object]

Break: Insecure implementation ,[object Object],[object Object],[object Object]

Break : Character Recognition ,[object Object],[object Object],[object Object],[object Object],[object Object]

Attacks – EZ-Gimpy 2000 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Attacks – EZ-Gimpy 2000 ,[object Object],[object Object],[object Object],[object Object]

Attacks – SimpleOCR Engine 2002

Attacks – Jan/Feb 2008 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Attacks – Projects ,[object Object],[object Object],[object Object]

Break: Human solvers ,[object Object],[object Object],[object Object],[object Object]

CAPTCHA Sweatshops ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

CAPTCHA Sweatshops ,[object Object],[object Object],$2.50 / h for each human 720 CAPTCHAs per hour per human 1/3 cent per account

Porn Companies (October 2007) ,[object Object],[object Object],[object Object],[object Object]

Next CAPTCHA Generation ,[object Object],[object Object]

reCAPTCHA (2007) ,[object Object],[object Object],[object Object]

reCAPTCHA ,[object Object],[object Object],[object Object],[object Object],[object Object]

Time spent ,[object Object],[object Object],[object Object]

Time spent ,[object Object],[object Object],[object Object],[object Object]

Time spent ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Wasted human cycles ,[object Object],[object Object]

Wasted human cycles ,[object Object],[object Object],[object Object]

Human Computation ,[object Object],[object Object],[object Object],[object Object]

Symbiotic relationship ,[object Object],[object Object]

The ESP Game ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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

The ESP Game ,[object Object],[object Object],[object Object]

http://gwap.com/gwap/ ESP Tag a Tune Matchin

http://gwap.com/gwap/ Squigl Verbosity

Future Games ,[object Object],[object Object]

Still not thinking big enough ,[object Object],[object Object]

Bibliography ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bibliography ,[object Object],[object Object],[object Object],[object Object],[object Object]

Bibliography ,[object Object],[object Object],[object Object],[object Object]

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