How does CAPTCHA "I am not a robot" work? (Faisal (BD i-Tech))
If you're surfing the web and you're not a robot by chance, you've probably done and passed some classic captcha tests where you've confirmed that you're not a robot. Good for you! Um, it's thought that the reason you're asked to press a button to confirm that you're not a robot is because robots can't do that simple action. Well, think again: Why didn't they know? Now the real reason for the captcha test is revealed - and it's pretty crazy.
At CAPTCHA, an acronym for Completely Automated Public Turing test to tell Computers and Humans Apart, users are given a task to prove that they are not bots. There are more annoying tasks like selecting the parts of the image that contain car parts or traffic lights – which bots will likely have a hard time doing (and so are we) – and simpler tasks like just confirming that you're not a robot. But how does it really work? Are bots so stupid they can't push a button?
So no. Bots, of course, know how to push a button. The reason for the test is completely different: a video that resurfaces (and manages to drive people crazy, according to Unilad) from British television's panel show, QI, explains that the test actually tests our behavior before we press the "I'm not a robot" button. Of course, bots have been created that can push the button, but they have trouble faking normal human behavior beforehand.
The captcha "I'm not a robot" (Photo: screenshot, iflscience.com)
According to cybersecurity firm Cloudflare, the test tracks the movement of the mouse's cursor as the user moves it toward the box. "Even the most direct movement of a human has a certain degree of randomness at the microscopic level: tiny unconscious movements that bots cannot easily mimic. If cursor movement contains some of this unpredictability, then the test decides that the user is probably legitimate," Cloudflare wrote on its website. "The Recaptcha may also check the cookies stored by the user's browser and browsing history on the device to know if the user may be a bot."
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This is the explanation
Cookies and recent history can tell your computer whether you are a human or a cyborg. "Let's say, for example, that before you ticked a check in a box, watched some cat videos, liked a tweet about Greta Thunberg, checked your Gmail account — all of this makes them believe you have to be human," QI presenter Sandy Talkswig said in the video. She added: "In fact, when you click the 'I'm not a robot' button, you're instructing the website to review your data and decide for itself."
When a robot has proven that it is not a robot:
Usually this test is enough for the program to recognize that you are human, but sometimes it will give you replacement captches, say if your mouse movement is a little too accurate or your browsing history is more appropriate than that of a robot. Surprised?