CAPTCHAs are a common test on the web and are designed to differentiate between real users and bots.
Google introduced reCAPTCHA v3 in hopes of reducing the number of challenges a user might see.
As bots that attempt to pass as real people become more sophisticated, Google has released new versions of its reCAPTCHA API.
The most well-known version of this test involves typing distorted text, with more recent forms asking users to identify objects in images.
The old reCAPTCHA system was pretty simple, just a simple “I’m not a robot” checkbox would get people through your login page.
The new version is even simpler and doesn’t use a challenge or a checkbox. It works invisibly in the background, somehow, to distinguish bots from humans.
Google doesn’t go into much detail about how it works,
other than to say that the system uses “a combination of machine learning and advanced risk analysis that adapts to new and emerging threats.”
With reCAPTCHA v3, Google is improving the experience even more, with the API returning a score between 0.0 and 1.0 that indicates “how suspicious an interaction is.”