A CAPTCHA or Completely Automated Public Turing test to tell Computers and Humans Apart is basically a kind of test that helps to distinguish a computer from a human being. It is under the trademark of Carnegie Mellon University. You can visit http://www.protectwebform.com/ for detailed information on CAPTCHA. 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. If you want to keep bots from getting your information, consider a CAPTCHA. Once you put the CAPTCHA online, as someone wants to sign up to get access to your information they will have to type in the letters that are being shown in a distorted image (i.e. http://www.protectwebform.com/plugin_wordpress). If they can't, CAPTCHA knows they are a computer and will turn them away. CAPTCHA has become very popular in the past few years because it is a program that can create tests which only humans can clear. Since the program is fully automated there is virtually no chance of any human intervention. No wonder, most website owners go for it. 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. Many email services and online blogs are the ones who could benefit most from CAPTCHA. If you have webmail accounts through Gmail, Hotmail, or Yahoo, you know how many spam e-mails seem to get into the system. In addition if you regularly read online blogs, you have likely seen some that have had a long string of spam postings. CAPTCHA can stop these posts from happening by catching the spamming programs before they have a chance to do their work. There have been numerous efforts at creating CAPTCHAs that are handier. Such endeavours usually include the use of JavaScript, mathematical questions (like "what is 1+1"), or simple questions requiring common sense (for instance "what color is the sky"). These attempts infringe on one or both of the philosophy of CAPTCHAs. Either they cannot be automatically created or they can be easily split given the condition of false intelligence. So, the only security these CAPTCHAs provide is safety through obscurity.
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A CAPTCHA or Completely Automated Public Turing test to tell Computers and Humans Apart is basically a kind of test that helps to distinguish a computer from a human being. It is under the trademark of Carnegie Mellon University. You can visit http://www.protectwebform.com/ for detailed information on CAPTCHA.
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