...
At DEFCON 18, a researcher presented an paper claiming that he had
devised an algorithm that would solve ReCAPTCHAs 30% of the time. While
that is only about a 1 in 3 success rate, when solving one ReCAPTCHA
fails a website generally pops up another, so a bot using this algorithm
would only need to keep trying until it eventually got one right.
...
Read More:
http://www.teleread.com/chris-meadows/recaptcha-now-vulnerable-to-computer-cracking/
