Yes, I thought this particular link was perhaps not the best way to present the work, mainly because the interesting part is actually this: "We accomplished thi

Yes, I thought this particular link was perhaps not the best way to present the work, mainly because the interesting part is actually this: "We accomplished this with a combination of Machine Learning, hashing methods, keyspace reduction tactics, and taking advantage of an overall limited number of captchas. Specifically, Stiltwalker goes head to head against reCAPTCHA'S audio captcha system and defeats all but a sliver of it's challenges." On the other hand, it looks like they provide a corpus (http://www.dc949.org/projects/stiltwalker/stiltwalker-corpus.tar http://www.dc949.org/projects/stiltwalker/stiltwalker-corpus...) [1.5 GB!] that you can still use to run the program.