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With the v3 of its reCAPTCHA system, Google will distinguish robots from humans without them having to perform particular actions.
A robotic filtering system which consists, for the user of an online service, in proving that he is a human, by solving one or more simple problems on which the machines are supposed to crash.
This definition of CAPTCHA * ("Completely Automated Public Turing Test to Tell Computers and Humans Apart") systems is traditionally given.
Google has in its portfolio a tool of this type, called "reCAPTCHA" and exploitable in the form of a JavaScript widget.
The first version always required the user to copy text.
V2 badyzes more signals to determine the level of risk for each request. The user thus has to copy text only in case of high risk. On the contrary, if the connection seems "legitimate", he has only to tick a box. In case of moderate doubt, he is asked to identify, among a set of images, those with similar content.
With the v3, just announced, Google promises to no longer solicit the user – and therefore not affect the conversion rate.
Each request is badigned a score of 0.0 (bot) to 1.0 (human). According to the note, measures can be taken at different stages of the user journey. For example, impose dual factor authentication, moderately comment, or block a transaction.
The score may, suggests Google, be combined with data of its own (user profiles, purchase history …) or used to lead fraud detection algorithms.
* Trademark of Carnegie-Mellon University
Photo credit: Check Point
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