Everytime you are introducing data into a form, the captcha appears to know if you are human. Why??, because somebody liked to make a program to fill up automatically forms for bad porpouses.. But Captcha, as any barrier is being broken, ...again to make things harder..., so what's next?? 3D Captcha?? :), ..errrr, sorry, that question has a "YES" answer??...
A group of people at Tel Aviv University has comed with a new development to have a dinamic 3D Captcha, which integrates blur and noise to an animated image in a way that a human being can see what's behind that "curtain of noise" but your inteligent PC will not be able to know it. An example here:
And yes, you will need to do both, get blind trying to get the figure in movement and answering the question as it already happens in some captchas, as well as adding this tech to your forms at your sites!!. This new Captcha system based on video is still on development, ...but keep an eye on it..
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