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People Are Just Now Learning How The “I Am Not A Robot” Captcha Test Actually Works

April 26, 2023 by Deborah Bloomfield

If you’ve been on the Internet and you aren’t a robot, you’ve probably taken and passed a classic “are you a robot” Captcha test.

In “Completely Automated Public Turing test to tell Computers and Humans Apart”, or CAPTCHAs, users are given a task to complete that separates them from bots. They range from irritating (“please select the parts of this image which contain hillocks”) to the not so much (click here to confirm you are not a robot). But how do these latter tests work? Are bots so inept that they cannot press the button?

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In short, no. A resurfaced clip (which is currently blowing people’s minds, according to Unilad) from British TV panel show QI explains that the test is actually looking at your behavior before you press the button. Bots have been created that can push the button, but they have a harder time faking normal human behavior beforehand.



According to cyber-security firm Cloudflare, the test tracks the movement of the user’s cursor as they move it toward the box.

“Even the most direct motion by a human has some amount of randomness on the microscopic level: tiny unconscious movements that bots can’t easily mimic. If the cursor’s movement contains some of this unpredictability, then the test decides that the user is probably legitimate,” Cloudflare says on its site. “The reCAPTCHA also may assess the cookies stored by the browser on a user device and the device’s history in order to tell if the user is likely to be a bot.”

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Cookies and recent history can tell the computer whether you are a human or Johnny 5.

“Let us say, for example, before you tick the box you watched a couple of cat videos, you liked a tweet about Greta Thunberg, you checked your Gmail account before you got down to work – all of that makes them think that you must be a human,” QI host Sandi Toksvig said in the video.

“Essentially when you are clicking ‘I am not a robot’ you are instructing the site to have a look at your data and decide for itself.”

Usually the test is enough to satisfy the program that you are human, but sometimes it will give you alternative captchas to take, say if your mouse wiggle is a little too precise or if your browsing history is that of a robot.

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[H/T: Unilad]

Deborah Bloomfield
Deborah Bloomfield

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Source Link: People Are Just Now Learning How The "I Am Not A Robot" Captcha Test Actually Works

Filed Under: News

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