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Filed under: Internet, Security, Yahoo!

CAPTCHA hacks could lead to a flood of junkmail

Yahoo! CAPTCHA
You know those annoying "please enter the code" requests you see when signing up for online services, leaving blog posts, or otherwise trying to prove that you're human and not a machine? Yeah, it turns out that the machines are getting pretty good at reading them too.

The basic idea behind the CAPTCHA (which stands for Completely Automated Turing Test To Tell Computers and Humans Apart is that computers can't read text if its hidden in an image file. But a Russian researcher claims that he received word that there was an automated CAPTCHA detection system floating around in the wild. So he decided to build his own and managed to create a system which he claims has a 35% accuracy rate.

The claim has some credence, since a Yahoo! spokesperson tells TMCnet that the company is aware of attempts to hack the CAPTCHA system and is working on improvements. In the meantime, if this thing catches on there's a chance you'll see a lot more junk mail letting you know about an opportunity to make $1,000,000 or enlarge certain body parts coming from Yahoo! Mail accounts and other free email services. While the CAPTCHA system was originally developed for Yahoo!, it is now widely used by other services and we're going to go out on a limb and say that if Yahoo!'s implementation of CAPTCHA can be hacked, we'll probably be seeing other sites hacked soon as well.

We suppose Yahoo! can always just make their CAPTCHAs harder to read. Or you know, impossible to read.

[via Slashdot]

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