I can see this technique being adopted by spammers converting “Buy Cialis from Canadian” into html instead of embedding an image.
Randomly switch between variations of this method, and regular image captchas and the bot has to stay on it’s toes prepared to process whatever comes it’s way.
The bot’s only hope then is to fully render the page as a browser would and then OCR the right area of the page. It doesn’t completely get rid of the possibility to bypass it, but it does make it a more expensive operation.
Comment by Ben — June 29, 2007
A quick google search shows that people are already working on this.
This is crazy, but I think it was an animator and a programmer playing around together making it Look like they really did this, when in fact it is just animation with and tags flying up the text editor window.