CAPTCHA - Protect Forms from Web Spam Bots

CAPTCHA , Completely Automated Public Turing test to tell Computers and Humans Apart, is a web security technique to protect HTML forms from web spammers. CAPTCHA dynamically generates security codes for sign-up, subscription submission or checkout forms to make sure that forms are not submitted by spam bots.

Because the generated password on a distorted image is a part of the image, users can’t copy and paste it. This way, it verifies that it’s an actual human that submits a form, not any kind of automated software including spambots.

The security codes that CAPTCHA generates are usually a combination of letters or digits that doesn’t mean anything. This technology can be used for any form submission on the Internet, including user registration, e-commerce transactions, surveys, Internet polls, search engine submissions, or free email registration.

CAPTCHA Example
CAPTCHA example Protect Forms from Spams

Free CAPTCHA installation plug-ins are available for many environments or languages including PHP, Perl, Phthon, WordPress, or MediaWiki.

Advantages of using CAPTCHA from captcha.net reCAPTCHA project:
- It prevents website registration spam.
- It prevents bogus comments in blogs.
- It protects email addresses from scrapers.
- It can be used more accurate online polls.

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