How Hackers Nearly Took Down Google's reCaptcha System

Last weekend a group of hackers unveiled Stiltwalker, a hack that subverts the reCaptcha system Google uses to protect its services from bots with 99 percent accuracy. But just hours before the group was set to present their hack at the LayerOne conference Google patched it up so it wouldn't work anymore. » 5/31/12 4:40pm 5/31/12 4:40pm

Anti-Spam Turing Test Is Really Global Human-Powered OCR System

You know the test you have to take on Digg or Facebook, the one that proves you're a human? You see a hard-to-read word or string of gibberish, and you type in the correct characters. Carnegie Mellon researchers decided to replace randomly generated words with actual words from ancient manuscripts, words that machines… » 10/02/07 9:25am 10/02/07 9:25am