Yahoo CAPTCHA Hacked

Few months ago we received information that yahoo CAPTCHA recognition system exists in the wild with the recognition rate about 30%. So we decided to conduct few experiments. We explored yahoo CAPTCHA and designed a similar system with even better recognition rate (about 35%). The vendor was notified.

The vendor didn't reply. In this article we’ll present you our own research.

Many internet resources that specialize in CAPTCHA recognition claim that yahoo CAPTCHA is very difficult for machine recognition.