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Home | Computers & Technology | Security When you take the test that CAPTCHA gives you and give the right answer, it knows that you are a human. For instance, it will ask you to key in letters from a distorted image of alphabets and numbers. The machine will not be able to figure it out correctly. That makes it quite easy for CAPTCHA to know the difference. You can get further details from http://www.protectwebform.com/smartcaptcha. If you've put your email address anywhere on your website, there's no doubt you've gotten a lot of spam because of it. Unfortunately what you do to let those who visit your website contact you, is what bots (animated programs searching the web for user id's and emails) are looking for. They grab a hold of that email address and add it to their lists that are about to be used, without your permission, for spamming. CAPTCHA ensure that the spammers do not get access to your email ids. Many websites and sign up pages use CAPTHCA Plug-in (http://www.protectwebform.com/plugin_wordpress). The distorted messages that the user has to type in ensures that the user is human. CAPTCHA assumes that computer programs cannot read distorted characters. As a fully automated program, CAPTCHA is so advanced it creates tests that can only be completed properly by humans. And since it runs itself, you don't have to baby-sit the system for it to work. This is why so many webmasters use CAPTCHA to keep their sites safe and secure. CAPTCHAs prevent abuse of a system. Once spammers get access to your mail id, then you are trapped. You will be bombarded with spam mails and you can never be sure what your id will be used for. In other words, CAPTCHA not only prevents encroachment by spammers for commercial purpose, it also protects the systems that are gullible to spam like, the webmail services of Gmail, Hotmail, and Yahoo. They also help prevent automated postings on online blogs. CAPTCHA helps in enforcing a usage policy and prevents any kind of deviation from the policy. This is required in case a service allows automated use but within a limit. There are others out there that claim to do what CAPTCHA can do. They have created similar programs that ask varying questions to allow someone to get into a site or sign up for a blog. None of them are as reliable as CAPTCHA because with a database, any of the other programs questions could be answered, while the CAPTCHA image recognition system is foolproof. Article Source: http://www.articlewheel.com
The author, Oleg, is an expert on CAPTCHA design. Click to find out more about his revolutionary new Smart CAPTCHA technology.
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