Application to distinguish between Humans and Machines

When we create a new account, either to become a member in a website, e-Mail, or a comment form on a website, at the end of the filling form 'll often see multiple digit numbers listed in the image, or fill out a simple addition and subtraction results like 9+1=?, 7-4=? or a series of letters in the image, etc. That is called a CAPTCHA.

CAPTCHA exampe.

CAPTCHA stands for "Completely Automated Public Turing test tell Computer and Human Apart". CAPTCHA popularized since many weblogs on the internet. Weblogs generally provides the facility of interaction between bloggers (creator of the blog) and visitors by filling a comment form. Because the popularity of weblogs, comments media is often used to increase the popularity of the new websites.

It was not a problem initially, but later the weblogs began to the comment floods that have nothing to do with the article that was written, also the ads that come continuously without stopping, this strange behavior is the act of the robot spam, an automated program that made to send messages/ads continuously to make a comment on a website that has a high ranking on the internet. The spam comment is annoying. We needs to find a solution that could restrict robots to not continue this brutal act. For that purpose the CAPTCHA was created.

Numbers or letters that are printed in an image file for a computer is pixel color code, so as to decompose it takes a very long time, not to mention when mixed with background made ​​snaking impede writing, so it was virtually impossible for computer to guess what the characters shown in the image. While humans can easily see and immediately wrote the character listed, or perform process calculations such as addition or subtraction. Through this test may ultimately distinguish between human and machine. *** [EKA | FROM VARIOUS SOURCES | SEPTI | PIKIRAN RAKYAT 21112013]

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