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 create and score tests automatically. They admit all humans and discard almost all machines. Humans can usually read tarnished images, but OCR machines cannot. [You can find out more details in http://www.protectwebform.com/]
Spammers are a nuisance for both the business websites as well as the visitors. While the business websites wish to provide a feature on their site for visitors to drive response and try to ensure protection from spam. But, if you post an email on your website, you are sure to invite spammers. In order to avoid this, websites use an assortment of tricks and methods to conceal your email address to make it difficult for spammers 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.
CAPTCHA requires you to identify and enter some indistinct characters shown on the screen for confirmation before submitting the form when you are person registering with these sites. By doing this it can distinguish between humans and machines because the computer will not be able to identify these unclear characters and alphabets. No wonder this form is construed as automatically authenticated and submitted by a human visitor rather than some computer generated program.
The greatest advantage of CAPTCHA is that it averts bots from misusing Internet services.Bots are programs that model as humans on the Internet. They are created not to rule but to sell, sign up for numerous free email accounts every moment, sending millions of Spam messages from them. They get into chat rooms; they accumulate personal information; and they post links to promotional sites. They create worms, break password systems, assault confidentiality, and deplete resources. If you want to avoid all these dangers you can customize your CAPTCHA with colors and fonts of your choice. You can also choose the image you like, with CAPTCHA Plugin. For furher details visit http://www.protectwebform.com/plugin_wordpress.
The use of CAPTCHA is therefore becoming increasingly popular because when you insert CAPTCHA code in your web pages it gives you a dependable method to authenticate that the registration is being tendered by a human being and not by some computer generated process. Use CAPTCHA to Avoid Spammers
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Oleg is an expert on CAPTCHA design. Click to learn more about his new CAPTCHA Plugin technology.
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