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What is Image Verification ( Captcha )?
A security test to determine whether or not the user
is human. This will ensure that only human visitors will
actually submit the form, and not spamming bots that are
browsing the web from site to site and submit spam where
they can. It is well known that programmers can do
programs for many jobs, including visiting a large
amount of sites on the Internet by following links from
page to page and collect emails listed on websites,
submit contact forms, or even trying to break passwords
by trying to login over and over again with computer
generated passwords.
Fortunately, it is impossible for a non-human ( ex.
computer program ) to extract a word or a combination of
letters and numbers from an image, if the letters and
numbers are not all of the same size and of similar
font. This is why, the Image Verification security
method ensures that only people actually can submit a
form.
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