captcha.sk

captcha is an automated test with the purpose of telling humans and computers apart. humans can pass it, computers can not.

projects

references / publications

The Official CAPTCHA Site- the official website of the project with basic introduction and further references
CAPTCHA: Using Hard AI Problems For Security- a formal definition of CAPTCHA
reCAPTCHA: Stop Spam, Read Books- a high-quality and practical implementation of an OCR-based test
ESP-PIX- a well-known visual CAPTCHA, where the task is to find a common term for four pictures
MSR Asirra: A Human Interactive Proof- telling cats and dogs apart or more precisely a parallel visual binary CAPTCHA
The IMAGINATION Project: Image Based CAPTCHA- an interesting two-step visual test
CAPTCHA: Rozpoznávanie ľudí a počítačov na webe- my bachelor's thesis about CAPTCHAs

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