Skip to main content

How does CAPTCHA work?



CAPTCHA ! CAPTCHA ! CAPTCHA ! Before reading this article, you have to prove that you are not robot. HAHA ! I was just kidding friend. In my blog, everyone are welcomed by heart. But I am sure that you have seen such question or text scattered in internet, asking to prove that you are robot or not. If you have wonder that what is it and why it is done, then you are in right place. Here you will get all answers. For that please read this article till the end. Let us start. Have a great read.

What is CAPTCHA?

Whenever we have to fill a form online for anything or signing up any account or booking online tickets, we are usually asked to pass a test. That test is of different types. It can be to rewrite a puzzled text or twisted bend letters or recognizing particular pictures. Those test are called CAPTCHA. CAPTCHA stands for Completely Automated Public Turing Test to tell Computers and Humans Apart and It means that it is a test with the help of which computer or system can recognize that the user is a robot or a human.

Difficulty levels of this test for humans and robot

For talking about the difficulty level of this test then let me tell you that this test is not for troubling the human. It is just to distinguish robot and human. This test is well designed in such a way that it is easy for humans but difficult for robot. So according to research and its design, success rate are given below:
1. As this test is very easy for humans so the success rate that come out is
    Success Rate For Humans > 80%
2. And as mentioned before, it is well designed to restrict robots so it is very difficult for robot to pass such test and the success rate that come out is
Success Rate For Robots<0.01%
But you have been wondering that why such test are done. So don't worry let us know it now below.

Purpose of using CAPTCHA.

Talking about this topic that why many website and forms use this test then don't worry I will tell you here. It is a challenge response test that distinguish robot and human to restrict robot for any further action. It is used to stop all hacking and spams in internet. For example when we have to book a instant ticket for railway on time, we fill all the data but it take some time within which someone else can take away your sit using a script or bot. Bot are script that are program which can do task in just couple of min or second in computer. Many hacker and spammer also use such bot to create thousand of thousand email accounts. So to stop such spam and hacking, CAPTCHA was invented.

Evolution of CAPTCHA.

This test was invented in the year 1997 to restrict all those bot to prevent all spams. This early designed captcha was based on the ability of solving of distorted words that are easy for humans but difficult for robots.
How does CAPTCHA work?

 But some of those distortion of words were making trouble even for some humans so many other ways were used to make easy for humans and difficult for robots.

In this way, in the year 2008, Luis Von Ahn, who is the founder of Duolingo, redesigned the captcha and named it re-CAPTCHA. But in the year 2009, Google bought this re-captcha company for some improvement because they also wanted to stop spam. Google well designed it and came with a concept called The Invisible Captcha.

re-Captcha ( The Invisible Captcha)

re-captcha

In this invisible captcha, user are just asked to click on a box for a green check mark and test is done. But as mentioned in name, test is done invisibly. Here when you click on that box, you indirectly all google to check your IP address, location and most importantly your mouse curser movement just before click that box. By checking your curser movement, they detect that is it done by human or a robot. As the curser movement by robot are perfectly straight but by human it is little zig zag. In this way in this re-captcha, they process all the test in background by saving our time.

Also Read. How does Internet work

Conclusion

So, this all was about captcha, its purpose, working and evolution. I tied my best to cover all aspect in short. I hope you liked this article and it was helpful for you. If you have any further queries then you can ask me in comment section below. I will definitely answer them.
Please share this article in your friend circle so that we all together can share knowledge. You can share this in social media platform and even you can follow me in social media for instant update.
For not missing any further more interesting update and post in this website then don't forget to subscribe this website. Till then take care. Thank you✌.

Labels:

Comments

Post a Comment

Popular posts from this blog

Mobile hang. How to fix this problem?

   How to fix mobile hang problem Friends, if you used a smart phone, you must have faced a mobile hang problem at some time or you may have seen your mobile hangs many times, so you do not know why your mobile hang. What is the reason for mobile phone hanging and how can it be fixed? There are many reasons why a smart phone hangs, there is less RAM in the mobile, less internal storage, virus attack etc. So in this article we give you some tips that follows and you can fix hang problem in your mobile. Also those reasons that make mobile hang .    Although it is common to have a smart phone hang, almost every smart phone hangs, but you have seen that when we get a new phone, our mobile phone does not hang at all that time and neither does it slow down but as we do install and use different types of mobile apps, then our phone gradually becomes slow and the mobile phone starts to hang, then what is the reason that causes our phone to hang and what should we do ...
Post a Comment
Read more

Qualcomm Snapdragon 865 : Top 5 features to know.

  Qualcomm Snapdragon 865 : Hey guys so, I am back with our fresh new article on latest update from Qualcomm . Yeah, you guessed it right, I am talking about Qualcomm Snapdragon 865 . Recently Qualcomm announced the all new Qualcomm Snapdragon 865 mobile platform in Maui and this is basically their flagship mobile chipset for 2020. You are pretty much gonna see it in like every single flagship Android phone in the coming year. There is a lot to unpack here.    Firstly this is still a 7 nanometer chipset so, there is no dice ranked since the 855 but that does not mean that it is not quite a bit better. There are   lot of improvement in this chipset.   So, let’s get started. Qualcomm Snapdragon 865: Top 5 features to know. Performance & Battery:    Firstly starting with performance and battery efficiency, Qualcomm is rating the Snapdragon 865 to have 25 percent better performance and battery efficiency over the Snapdragon 855...
1 comment
Read more

How to send file more than 25MB in Gmail

  How to send file more than 25MB in Gmail : Gmail is a very popular free email service that is used all over the world to send and receive emails, if your work is related to the internet then you must be using the Gmail service to receive files for sending documents. But you must have seen many times that we try to send files of more than 25MB in Gmail, such as photos, videos or documents. So we cannot send it in Gmail. That is, if you have to send photos whose size is more than 25, then you will have to send one by one only then you can email the photos but we will tell you how you can send more than 25MB file size in Gmail ID.    If you want to send a file size of 25MB in Gmail, by email then for this Google has created cloud storage called Google Drive , in it you can store up to 15GB of data online, with this you can help it. You can send a file size of more than 25MB in an email, so let’s learn how to send and upload a file size of more than 25MB with G...
1 comment
Read more