In this blog, you are going to learn what is Recaptcha, different versions of Recaptcha, ReCaptcha v2 vs v3, and invisible ReCaptcha. When you fill any kind of form or sign in into any websites, you have come across “I’m not a robot” checkbox. This checkbox is above the submit button. When you click on this checkbox it will challenge you to solve captcha with some images. This challenge is easy for humans to pass but difficult for bots. To avoid spamming in the websites the reCAPTCHA is introduced. The full form of CAPTCHA is a “Completely Automated Public Turing test to tell Computers and Humans Apart.”
What is reCAPTCHA?
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse. It is easy for humans to solve, but hard for “bots” to figure out. A bot is a script that runs automated tasks over the Internet. Typically, bots perform tasks that are simple and repetitive, much faster than a person could. Google Recaptcha is integrated into the website which has forms or any sort of user engagement feature. By adding reCAPTCHA to a website, you can block automated software or scripts from spamming and while helping your welcome users to enter with ease. The different versions of ReCaptcha are listed below.
Different Versions of reCAPTCHA:-
ReCaptcha version 1 can take many forms but here are the most common ones like distorted text or numbers. In this version, the user has to enter the text or number which is difficult for bots to read it. reCAPTCHA v1 is no longer available it has been shut down in 2018.
(a) ” I’m not robot ” Checkbox:
You have seen this checkbox in many forms above the submit button. Now let’s see the demo of reCAPTCHA v2 – ” I’m not a robot ” checkbox.
Consider this demo form, you can see the checkbox indicating ” I’m not a robot. “ After filling all details when the user clicks on the checkbox. It will either pass the user immediately with no CAPTCHA or challenge them to validate whether or not they are human.
Note that when you sign in into your Gmail account and solve the captcha then it will pass you quickly without challenging.
(b) Invisible reCAPTCHA:
In invisible reCAPTCHA, there is not any checkbox above the submit button. Hence it is called invisible reCAPTCHA. It will challenge the user when it clicks on the submit button. Now let’s see a demo of how invisible reCAPTCHA works.
Link of demo form:- google invisible ReCaptcha.
Also Read: What is Tabnapping Attack?
In invisible ReCaptcha, the user does not require to click on the checkbox. Instead, it is invoked directly when a user clicks on an existing submit button. Whenever a user clicks on the submit button suspicious user will get a challenge to solve the CAPTCHA.
reCAPTCHA v3 is truly invisible. It does not show anything to the users. There is no challenge to select specified objects or the images as it does in the older version. Instead, it returns a probability score between 0.0 to 1.0 from all actions on your website.
If the score is between 0.0 to 0.3 then it is bot but if the score is between 0.4 to 1.0 then it is human. Let’s see the demo of ReCaptcha v3.
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If you visit this Demo link from chrome browser while you are logged in with your Google account then you will receive a high score of 0.9. Which means you are not a bot. But if you visit the demo link from a private browser or duckduckgo app then you will receive a low score of 0.1. Which means you are bots.
The issue related to Recaptcha v3 is that in case you receive a low score for whatever reason there is nothing you can do on your end. The scores will be visible to the website owner who has integrated recaptcha v3 on their website.
Also Read: Difference Between Google reCAPTCHA v2 Vs v3
Difference between Google reCAPTCHA v2 vs v3:
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