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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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