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CAPTCHA is the acronym of ‘Completely Automated Public Turing test to tell Computers and Humans Apart.’ It is a kind of test based on challenge responses. From the response it gets it can make out whether the user is human or not. In an ordinary kind of CAPTCHA the user has to key in the letters of a fuzzy image to see them emerge on the screen. Often, the user has to supplement masked series of letters or digits to do that. Only then they will emerge on the screen. CAPTCHA has the ability to create and score tests automatically. It can tell the difference between humans and machines and it admits all humans and discards almost all machines. Its tarnished images can be read by humans only, not by OCR machines. [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. One way to do it is by embedding Java script in the web page to capture the email address when the page is displayed to the visitor. An enhanced alternative is to use CAPTCHA along with the website forms. You must have seen this feature in use 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. A CAPTCHA is intended to avert bots – programs that model as humans on the Internet – from misusing Internet services. Bots 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 penetrate chat rooms, accumulate personal information and posts links to promotional sites. They create worms, break password systems, assault confidentiality, and deplete resources. With CAPTCHA Plugin, you can customize your CAPTCHA with preferred colors and fonts. You can also decide among loads of image types. [See http://www.protectwebform.com/plugin_wordpress]. Smart CAPTCHA is a technique of improving the CAPTCHA to make work easier. It was proposed by ProtectWebForm. They recommend that you join the CAPTCHA with JavaScript support. They planned to use an easy script, which fills up the CAPTCHA fields and conceals the image and the field from human eyes because most spam robots find it difficult to carry out scripts. They have used the method of safety through shadows. They defend your site because authors do not come across the exact kind of JavaScript in question. For furher details visit http://www.protectwebform.com/smartcaptcha. 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
Article Source: http://www.philvault.com
The author, Oleg, is an expert on CAPTCHA design and development. Click to find out more about his new CAPTCHA Plugin technology.
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