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AI bots now beat 100% of those traffic-image CAPTCHAs (arstechnica.com)

submitted 2 months ago by [email protected] to c/[email protected]

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Anyone who has been surfing the web for a while is probably used to clicking through a CAPTCHA grid of street images, identifying everyday objects to prove that they're a human and not an automated bot. Now, though, new research claims that locally run bots using specially trained image-recognition models can match human-level performance in this style of CAPTCHA, achieving a 100 percent success rate despite being decidedly not human.

ETH Zurich PhD student Andreas Plesner and his colleagues' new research, available as a pre-print paper, focuses on Google's ReCAPTCHA v2, which challenges users to identify which street images in a grid contain items like bicycles, crosswalks, mountains, stairs, or traffic lights. Google began phasing that system out years ago in favor of an "invisible" reCAPTCHA v3 that analyzes user interactions rather than offering an explicit challenge.

Despite this, the older reCAPTCHA v2 is still used by millions of websites. And even sites that use the updated reCAPTCHA v3 will sometimes use reCAPTCHA v2 as a fallback when the updated system gives a user a low "human" confidence rating.

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[–] [email protected] 4 points 2 months ago (1 children)

Fwiw they aren't really asking about the motorcycle. I mean they are but they are washing your mouse movements and how fast you click through the images. It's okay to get a few images wrong.

[–] [email protected] 8 points 2 months ago

Not quite.

It's mostly wisdom of the crowd, as it always has been.

As long as you mostly click the same squares most other people click, you pass.

You often at random get 2-3 images because 2 of them are actual checks, but the third is a new image that you auto pass and they're using it to gather data on what the average clicks are on it.