CAPTCHAs überwinden
Ein paar Resourcen warum CAPTCHAs nicht die Lösung gegen Spam und robots sind:
Accessibility Problems with Visual Verification Systems
Matt Mays W3C Präsentation über Schwächen von CAPTCHAs
Using AI to beat CAPTCHA and post comment spam
this article is about writing a comment spam bot. it ended up posting 94 comment messages to CAPTCHA protected blog pages in 10 minutes. all it does is visit a blog post and download the associated CAPTCHA image. then it uses some image processing techniques to parse out the characters in the image. each character is then run through some AI processing to figure out what letter the character image represents.
Ergebnisse des Programms EZ-Gimpy der Universität UC Berkeley.
PWNtcha stands for “Pretend We’re Not a Turing Computer but a Human Antagonist”, as well as PWN capTCHAs. This project’s goal is to demonstrate the inefficiency of many captcha implementations.