I'm Not a Robot ! What is CAPTCHA or reCAPTCHA ? How Does CAPTCHA Work .

Completely Automated Public Turing Test To Tell Computers And Humans Apart (CAPTCHA)

I'm Not a Robot ! What is CAPTCHA or reCAPTCHA ? How Does CAPTCHA Work .
I'm Not a Robot ! What is CAPTCHA or reCAPTCHA ? How Does CAPTCHA Work .

Definition - What does CAPTCHA mean ?

Completely automated public Turing test to tell computers and humans apart, otherwise called CAPTCHA, is a test to ensure reactions through a human vs a PC program.

CAPTCHA was developed at Carnegie Mellon University . CAPTCHA automatically produces response challenges by giving an issue which must be solved by people, automatically avoiding access to system software and asking for a typed character series.

A PC administers CAPTCHA to a human, while a human oversees the Turing test to a machine.

Globaltechtalk explains CAPTCHA :

Websites use CAPTCHA to prevent quality of service (QoS) debasement by bots or other automated programs by utilizing a test just understood by people. CAPTCHA improves security by utilizing background noise, which shows up as character letters or links to real letters. Every online systems are always helpless against hacking. Counting a CAPTCHA component on an registration form can help avoid brute-force hacking attempts. This is basically one component of security, as getting around a CAPTCHA component on a page is extremely simple for a human.

To the normal user, the CAPTCHA component is "that annoying box at the bottom of an registration form." While it is easy to implement from a Web development point of view, a website designer needs to choose whether user inconvenience worth the additional security.

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explains reCAPTCHA :

This thought an interesting application of CAPTCHA. There are several projects of changing over books to the digital book version. One technique is to scan the books and utilize OCR software to convert image of text to actual text. In any case, someone needs to approve whether the conversion is successful. Luis von Ahn, Ben Maurer, Colin McMillen, David Abraham and Manuel Blum at Carnegie Mellon University created reCAPTCHA to help in this issue. Rather than random texts in CAPTCHA, genuine writings from examined books are appeared. The user composes the digital text. This is utilized to approve each word from several users.

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