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Do You Need CAPTCHA? |
By:
Oleg |
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Do You Need CAPTCHA?
by Oleg
CAPTCHA, the short form of Completely Automated Public Turing test to tell Computers and Humans Apart is essentially a sort of test that recognizes whether the user is a computer or a human being. It comes under the trademark of Carnegie Mellon University. For more information, you can go to http://www.protectwebform.com/.
After a CAPTCHA is installed, when there is an attempted access to the system there is a test given to determine if it is a human or a computer attempting access. Generally, CAPTCHA uses a picture of some distorted letters or numbers and asks for them to be retyped. A person can understand what the distorted letters are supposed to look like, while a computer cannot. Therefore, if the right answer is given, the test determines they are human. It's very easy to use and you can learn more about it at http://www.protectwebform.com/smartcaptcha.
Most website owners opt for a function wherein the visitors can send in their feedback without allowing spammers to barge in. The moment you post your email id on the net, you can rest assured of the attack from the spammers. Automated programs that are better known as bots have the ability to scan your website and parse out your mail id. The spammers use the email ids for many purposes without your knowledge or permission.
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.
CAPTCHA can be said to be a program that has the capability to create tests which only humans can clear. The program is a fully automated program and no human intervention is required. Thus it is so much preferred by website owners. CAPTCHA has become very popular in the past few years.
Spammers are a nuisance. Once they get hold of your email id, you are bombarded with spam mails and you can never be sure what your id will be used for. This is where CAPTCHA comes to your rescue by preventing abuse of your system.
CAPTCHAs not only prevent 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. There are some services which might allow automated use but within a limit. In such a scenario CAPTCHA helps in enforcing a usage policy and prevents any kind of deviation from the policy.
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.
Oleg is an expert on CAPTCHA design. Click to find out more about his new Smart CAPTCHA technology. This and other unique content 'CAPTCHA' articles are available with free reprint rights.
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Article Source: http://www.statssheet.com/articles/article53892.html |
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