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CAPTCHA ?? WHY ??

CAPTCHA

 CAPTCHA : IT was a process used in computing to determine whether or not the user is human.
Captcha is use to prevent from spamming
Example : If your are trying to book a tatkaal ticket and website of tatkaal ticket booking are generally open at 11 pm before 24 hours. You are sitting in-front of computer screen , you open that website ,you will take around 2 min to fill all info which is required to train booking ,and other person will use a programmable script to fill and proceed their .For this valid reason captcha use.

CAPTCHA

About


Captcha is invented in 2003 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford . After sometime many tactics to overpass Captcha like  optical character recognition (OCR) attack in which computer can recognize that text which was using as Captcha  in the form of image .

captcha full form :

CAPTCHA




Captcha 2


Captcha 2 it is also know as recaptcha .It is advance form of Captcha . It was made , to get in mind about  (OCR) . Captcha 2 show only that words which were (OCR) free.

optical character recognition

Captcha job


At that time, many companies are working as captcha job , where many humans sitting in-front of computer and they fill other's Captcha and give service and charge them.
In simple words : human operators who are employed to decode CAPTCHA


 Advance form of recaptcha :

Google


At 2009 Google buy the company recaptcha . Google worked on this recaptcha and finally google form  Advance form of recaptcha , where with the help of single tick ,google can  determine whether or not the user is human.

This process works on machine learning :


recaptcha

When you tick on that robot verification:


* It tares you courser position.
*It take all your data related to that page like staying time , IP address  .mac address etc.
 then with the help of machine learning it calculate that you are human or not.








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