How does the new Google ReCaptcha work?

You've probably seen that some sites have a new Captcha anti-robot system where you only need to unhook the house. But how does Captcha know that the house was unhooked by a man and not a robot?

In fact, it's not a classic Check field, but a giant within an iframe. In addition, there is an invisible field in which a unique value is entered, and that field cannot be loaded by a robot because it does not support JavaScript.

Still, some robots support JavaScript, does that mean the new Captcha is still vulnerable? Of course not. Clicking the Check field and storing the unique Code in an invisible field is not the only protection mechanism. Captcha is so sophisticated that it uses many more parameters, based on which it determines whether the field was clicked by a human or a robot.

This algorithm tracks the movement of the cursor on the site, how you clicked on the field, how long you stayed on the site, what you watched, tracks your internet surfing history, activities, cookies… And Google Analytics and AdSense algorithms even better block bots that otherwise increase views on pages and the number of ad clicks.

However, these are just some of the methods that the new Captcha uses. Google did not provide all the information for security reasons – so as not to create robots that falsify this information.

If Captcha is hesitant, i.e., can't determine if the field was clicked by a human or a robot, offer a classic test where you need to enter numbers from an image (or select thumbnails if you're on a mobile device). But there is also improved protection, so this action has limited time to make it harder for robots to solve the task.

The new Captcha is widely available to everyone and anyone can implement it on their site, and is it better than the previous one? Of course! Instead of making it increasingly difficult to identify images, Google decided to make it easier for people and make robots' work harder.