The results don’t sound particularly good: an accuracy rate of 70%, with an average of about 20 seconds per CAPTCHA, with only a modest test set of images in the test set.
In an amusing irony, they were able to use Google’s own massive image search database in reverse, finding words to match an image, rather than images to match a word, to help them find images in a reCAPTCHA set that shared a particular characteristic. “all pictures with street signs”), weren’t as random or as varied as you might think.
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The researchers investigated how crooks could to try to speed up the rate at which they can try new CAPTCHAs how to guess how the CAPTCHA process works behind the scenes in order to game the system and how to use other online services to solve CAPTCHAs automatically more quickly than the designers thought possible.įor example, the researchers noticed than Google’s image-based reCAPTCHAs, which ask you to pick images with matching characterics from a randomly-chosen set (e.g. Indeed, their research is much more general, and in many ways much more useful, than a simple “we found a bug, now fix it.” The headline chosen for this paper is somewhat unfortunate, for all that it attracts your attention, because the researchers haven’t really “broken” anything. They are, after all, devised to slow down crooks in order to protect online resources from deliberate, malicious overload, so a crook who can work around a CAPTCHA’s speed bumps can claw back the criminal advantage he originally enjoyed.Īt this point, the CAPTCHA’s creators need to respond by adapting the CAPTCHA puzzles” so that the crooks have to go back to solving them by hand. Nevertheless, CAPTCHAs represent something of a security arms race.
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This is supposed to make it costly and complicated for cybercrooks to write programs that can rapidly register for hundreds of free email accounts, for instance, while at the same time making it not too annoying for legitimate users to sign up.ĬAPTCHAs don’t have to be perfect, and if crooks (or security researchers) figure out how to trick them once in a while, the internet isn’t going to collapse. The idea is that that humans can solve CAPTCHAs with a modest effort and not too much irritation, but even fast computers can’t deal with well-designed CAPTCHAs reliably at all. Three security researchers from Columbia University in New York recently published a paper with a rather dramatic sounding title: ✔︎ I’m not a human: Breaking the Google reCAPTCHA.Īs you can see, the title really does start with a check mark (tick), shown in green, and it’s a play on the Google reCAPTCHA interface, which pops up a message like this once you’ve solved the puzzles it presents:ĬAPTCHAs are Completely Automated Procedures for Telling Computers and Humans Apart, and they usually take the form of interactive puzzles based on fuzzy writing or blurry images (and even, in one humorous example, calculus problems).
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