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What is Captcha and How Does it Work?
04/11/07
What is Captcha and How Does it Work?
Apr 11, 2007 - Linknet Internet >>
 | Professional Graphic Design Company - Philadelphia creative graphic design company. |
What You Need To Know About Captcha - by Oleg
CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. It is a kind of challenge-response test that is used in computing to distinguish between humans and machines. The basic CAPTCHA requires that you key in the letters of a fuzzy image, sometimes with the supplement of a masked series of letters or digits that emerge on the screen.
CAPTCHA can not only create these tests automatically but also store them. The basic principle is that they admit all humans and discard almost all machines since humans can usually read tarnished images, but OCR machines cannot.For more details please visit http://www.protectwebform.com/.
Most of the business websites wish to provide a feature on their site for visitors to drive response while avoiding spam. Posting an email on your website is a sure shot invitation for spammers. There are assortments of tricks and methods to "conceal" your email address so that spammers find it difficult to track.
The best method for doing this is to embed Java script in the web page to capture the email address when the page is displayed to the visitor. A more sophisticated method is to use CAPTCHA along with the website forms. It's a common sight on big websites which require you to sign up...
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