I have noticed that some CAPTCHA pages, like Cloudflare's, simply ask you to check a box to proceed. There is no clicking on traffic lights or entering characters. How does clicking on a check box tell them I am not a robot?

you are viewing a single comment's thread
view the rest of the comments
[–] 26 points 2 years ago (1 child)

Because it measures how your mouse moves to the checkbox. If there was nothing to move to, you wouldn’t move your mouse.

  • source
  • parent
  • hideshow 2 child comments
  • [–] 13 points 2 years ago (2 children)

    I get the checkbox even on mobile sometimes, I imagine as long as you're not perfectly hitting the center pixel it knows you're human.

  • source
  • parent
  • hideshow 4 child comments