What is CAPTCHA? How Does it work? What is use of it? Click Me To Know More!
CAPTCHA: Completely Automated Public Turing test to tell Computers and Humans Apart.
Have you’ve ever tried to register with a website or comment on a blog and been asked to enter some crazy characters that have been all jumbled up, you know how frustrating it can sometimes be to tell a lower case L from a number 1 or an uppercase O from a number 0.
We’ve been there. We’ve sat up and peered at the computer screen trying to figure out if the offset line was supposed to be the curl of a J or the straight line of an I.
So, what are those crazy letters and why do we have to type them into the website to move forward?
This technology is called CAPTCHA , an acronym for Completely Automated Public Turing test to tell Computers and Humans Apart. A CAPTCHA is usually a graphic image with a series of distorted letters on an equally distorted or multicolored background.
The technology is used mostly to block spammers and bots that try to automatically harvest email addresses or try to automatically sign up for or make use of Web sites, blogs or forums. CAPTCHA, whose users include Yahoo and Google, blocks automated systems, which can’t read the distorted letters in the graphic.
The algorithm for CAPTCHA is public, as the “P” in the name implies. The test was developed in various forms around 1996, but it got its distinctive name in 2000 from researchers at Carnegie Mellon University and IBM. Cracking the algorithm won’t make the CAPTCHA vulnerable, since the algorithm is only used for generating the random series of letters and numbers in the image. The system works because humans and computers process strings of characters differently.
One of the problems with CAPTCHA is that sometimes the characters are so distorted that they can’t even be recognized by people with good vision, let alone visually handicapped individuals. Depending on local regulations for handicapped access to Web sites, this can also be a compliance issue for some Web-based businesses.
If a site or blog owner didn’t use some type of protection like CAPTCHA against it, they would be getting dozens of spam registrants or comments a day. And that’s just for small websites and personal blog that aren’t very popular. We can only imagine what the popular blogs must see.
-Some Common FAQ’S:
Who invented the Captcha?
The term was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper of Carnegie Mellon University, and John Langford of IBM. The most common type of CAPTCHA was first invented by Mark D. Lillibridge, Martin Abadi, Krishna Bharat, and Andrei Z. Broder.
What is reCAPTCHA?
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse. A “CAPTCHA” is a test to tell human and bots apart. It is easy for humans to solve, but hard for “bots” and other malicious software to figure out.
How does a Captcha test work?
For you, the test should be simple and straightforward. But for a computer, the test should be almost impossible to solve. This sort of test is a CAPTCHA, an acronym that stands for Completely Automated Public Turing Test to Tell Computers and Humans Apart. They’re also known as a type of Human Interaction Proof (HIP).
How can I add a Captcha to my website?
-How to Add the CAPTCHA Test to Your Feedback Form?
Sign up with the ReCAPTCHA site. Go to the ReCAPTCHA website, and sign up for an account. …
Enter Your Keys into the Feedback Form Wizard. Go to the Free Feedback Form Wizard. …
Update Your Website.
Hope This Helps!
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