The distorted images websites use for logins, known as captchas, or Completely Automated Public Turing test to Tell Computers and Humans Apart, work by distorting a set of numbers and letters in such a way that only humans would recognize them. For blind Internet users, websites use audible captchas, which do the same thing with sound. For a while, both types effectively prevented spammers from registering Gmail addresses with automated scripts. But Russians looking for a little extra cash — about $3 a day — helped crooks break Google's image captchas earlier this year. Now Wintercore Labs says Google's audio captchas are broken too. IDG reports:

Over the last few months, wily spammers may have figured out how to crack the security feature known as "captchas." With an army of compromised Windows PCs known as botnets, they've been using their new power to flood Google's Blogger with spam. Why Blogger?

Captcha codes are designed to be unreadable by computers, only by humans, so they can be used to lock spambots out of websites. But Google and Websense have determined, by analyzing traffic patterns, that captcha codes are being cracked nightly — not by machines, but by third-world employees. Brad Stone at the New York Times blogs that one Russian-language set of instructions for captcha-cracking promises a minimum $3 per day for the work.