: Captcha has always been vulnerable to a simple man-in-the-middle attack where the spammer relays the images to its own captcha on a website which offers mp3 downloads or porn for free. It
Captcha has always been vulnerable to a simple man-in-the-middle attack where the spammer relays the images to its own captcha on a website which offers mp3 downloads or porn for free. It doesn't matter what type of captcha you use.
Detecting behaviour patterns is the way to go.
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