But more deserves to be said. A site like Hotmail is a big, focused target for spammers. They face pain if a bot can beat their CAPTCHA even 10% of the time. Smaller sites get spam too, but they generally get it from dumber bots looking for unprotected sites. A 2 panel peoplesign CAPTCHA is probably all they need.
With 2 panels at 6 labels each, a random guess has a 1/36 chance to pass. Fortunately, a large number of incorrect guesses is behavior that can be detected and blacklisted.
Futhermore, peoplesign can be customized to offer more security. Number of panels (and soon number of menu labels) and other characteristics can be modified. Check out a customization demo at http://peoplesign.com/main/pickTheLabelDemo.html
Comments
You answered your own question. 30-40% > 3%.
But more deserves to be said. A site like Hotmail is a big, focused target for spammers. They face pain if a bot can beat their CAPTCHA even 10% of the time. Smaller sites get spam too, but they generally get it from dumber bots looking for unprotected sites. A 2 panel peoplesign CAPTCHA is probably all they need.
With 2 panels at 6 labels each, a random guess has a 1/36 chance to pass. Fortunately, a large number of incorrect guesses is behavior that can be detected and blacklisted.
Futhermore, peoplesign can be customized to offer more security. Number of panels (and soon number of menu labels) and other characteristics can be modified. Check out a customization demo at http://peoplesign.com/main/pickTheLabelDemo.html