I am not a robot.

We see this sentence more and more everywhere now. When entering a website, when logging an ID anywhere. This is because I'm not a robot to prove it.

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And this is how CAPTCHA is done in this evidence. Captcha full form is “Completely Automated Public Turing test to tell Computers and Humans Apart”.

What is the captcha?

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● In a word, Captcha is a small process for separating people and robots or other bots. Captcha concepts are born to ensure that people or robots that are operating on a computer's screen.

● The concept of this Captcha comes to the forefront of Luis von Ahn. He created it first. It started in 1997. But then there was no name for it. In 2003 it was named Captcha.

How does the Captcha work?

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● Captcha work is like a tire test. The user is given some small tasks. Which is not possible for any software or robot. Generally speaking, a distorted picture below a form of online form is asked to give the user the number of letters or digits. Captcha letters or numbers are not usually the way we write them. Rather, it is a bit rough or very unstable. It is not possible to decode an automated program.

● Captcha sounds or letters are sometimes so complex that it also makes it hard for people to understand. That's why many sites have the ability to convert captcha or listen to audio. According to Luis von Ahn, at least 60 million Captcha resolves every day. An average person takes 10 seconds to solve this captcha. The amount of time spent on completing CAPTCHA is equivalent to 160,000 hours a day or equivalent to about 19 years.

The beginning of Captcha:

The captcha began at the beginning to reduce the spamming on various websites. Then, various English words as CAPTCHA were from different books. For this purpose, many old books, magazines are scanned and created online database.

Mainly there are two types of captcha:

1. NoCapatcha

2. ReCapatcha

●This was exactly the way it started. But with the improvement of technology over time, different bots could also be able to fill these captcha words. The idea of No-Captcha Re-Captcha comes to Google to prevent it.

NoCaptcha:

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This is Google's more updated technology. In this case when you click on the capture checkbox send a HTTP request with some information to Google. For example, your cursor movement, your page scrolling information, your IP address, location, time etc. Most of the time Google's intelligence bot analyzes this data, and it is understood that a user is a robot or a person.

But the end is not the end. And then if intelligence bots do not have any idea about this information, then you can see the following image.

ReCaptcha:

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Where no word or letter input is given as before. It can be called image processing captcha, where there will be different pictures in small boxes, the user will be asked to find a specific object from the picture and tick the images. As a picture Google used his map. From the map, pictures of different products, road sign, supermarket etc. were shown. The user may have been told that there are no shops in the photographs or there is a roadsign or a car to select those pictures. Until you do it properly, you will not have access to next step. It becomes easier for people but for a bot or robot it becomes more difficult.

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