How could 'Bots be getting around a Captcha system

[tuqqer]

First time I've seen this: I have a pretty good Captcha system on my Contact Us page on one of my Wordpress sites, and for the past couple months, I'm getting what I presume are robot emails that are coming through, about 10 a week. Nothing worth hand wringing, but more just curious how they're doing it.

The challenge-response system I use seems complex enough: refreshed set of weird letters one needs to type in before the email gets sent.

Has anyone else seen 'Bots getting through their Contact Us page? Any suggestions for more robust methods for stopping them?

[beagledave]

Human farms and/or OCR?

http://arstechnica.com/information-techn...-captchas/

[Article Accelerator]

Google's image recognition system is now at least as good as that of the average human.

http://magazine.utoronto.ca/feature/gett...-machines/
"The practical uses for sophisticated image recognition seem almost endless, but one of Hinton’s projects is deceptively simple: getting a machine to read handwritten numbers. With great effort, he and his colleagues at Google have pulled it off. The software they’ve developed lets Google read the street addresses on people’s homes (vital for connecting the data from its 'map' function to its 'street view' function). 'The techniques we developed for that are now the best way of reading numbers in the wild,' Hinton says. 'And the neural nets are now just slightly better than people at reading those numbers.'"

[space-time]

They use the Gotcha software.

[tuqqer]

space-time wrote:
They use the Gotcha software.

hahahaha. good one for Friday morning, space-time.