A Neat CAPTCHA
Posted: Mon Mar 30, 2009 6:13 am
Hello,
Have anyone noticed the new CAPTCHA that MegaUpload uses? That's pretty neat!
At first look it seems hard to read, but when you "get the idea", it is actually simple for a human being to read it. However, for bots it does make some headache.
Basically, when two shapes collide, the area that collided will invert the color. After that, then the borders of each shape will be drawn as black. That's pretty much what it does.
Have anyone noticed the new CAPTCHA that MegaUpload uses? That's pretty neat!
At first look it seems hard to read, but when you "get the idea", it is actually simple for a human being to read it. However, for bots it does make some headache.
Basically, when two shapes collide, the area that collided will invert the color. After that, then the borders of each shape will be drawn as black. That's pretty much what it does.