CAPTCHA : A necessary evil

WHAT IS THIS?

Some of you might think that this is a very stupid question as after arrival of Jio almost everyone in India has internet access and hence there is 90% chance he/she might have gone through the irritating process of CAPTCHA, but let me remind you guys in contrast to the above statement still (late 2017) the rural internet penetration is only 20.26%*.

Now, for some of us who don't know what CAPTCHA is:

It's a kind of challenge -response test which is used to tell humans and bots apart. (Bot: A web robot that runs internet tasks over the internet). 

Also, it has got a pretty long name..So here's what CAPTCHA stands for - Completely Automated  Public  Turing test to tell Computers and Humans Apart.('Turing' was a test developed by Alan Turing..to know more :Turing Test) It was developed by a group of 4 people including Luis von Ahn. {I'm not giving out the other three names cause I want it to remain a blog and not turn it into a wiki and secondly no one gives a damn to the names, do we? :) } (Click for all the four names)

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You can find CAPTCHA almost everywhere, weather you're booking a movie ticket or making an online transaction.

*(Source:https://economictimes.indiatimes.com/tech/internet/internet-users-in-india-expected-to-reach-500-million-by-june-iamai/articleshow/63000198.cms)

WHY CAPTCHA ?

Spam. Everyone familiar with this word (I'm very sorry for others who're not) knows that this four letter word makes life look like hell in your inbox. 

The two main issues CAPTCHA satisfies is Security and Accessibility. Now let's put up some examples so that it can easily fit in our brains :

• It protects the transportation online booking systems from bots which book tickets in thousands later to be sold in black
• Protects users from spam comments on their blogs. (Although at this stage i would still be happy with spam comments  :) )
• Lastly, the most important is that it secures e-mail accounts.(quite familiar)  

TYPES OF CAPTCHA:

• The 'looks kinda easy' type (It even has an audio option !)

Could also be called 'almost extinct'

• The most common one (also called reCAPTCHA v2)

                           

Yeah , I ain't a robot 

• The newest kid on the block (still under development)

Also called 'reCAPTCHA V3', it's still under development and we all are wondering what more interesting and simple do the folks at google have in their heads !

**Now some you might have at some point in your lives got an opportunity to go through the 'math', 'shapes' or even 'puzzle' CAPTCHA.....but I tend to leave your imaginations to you only as the above mentioned types now only exist in our half heads.**

  

So time to bid adieu. I've tried to cover as much in the simplest way possible .Do leave your suggestions and queries downstairs and also don't forget to Follow my blog for regular updates . Thank You :)