General Discussion - Use of Captcha

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Use of Captcha

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Category: General Discussion
Forum Name: General Discussion
Forum Description: General discussion and chat on any topic.
URL: https://forums.webwiz.net/forum_posts.asp?TID=28530
Printed Date: 28 March 2026 at 3:11pm
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Topic: Use of Captcha

Posted By: renudiz
Subject: Use of Captcha
Date Posted: 17 April 2010 at 10:20am

Please tell me why we use captcha while while validating a form. What is the use of captcha

Replies:

Posted By: WebWiz-Bruce
Date Posted: 19 April 2010 at 9:19am

It prevents a number of different things:-

Form submission by automated programs, often used by spammers to search out forms which the automated program or 'bot' fills in and submits to the server
Cross site forgery request where a logged in user will be tricked into visiting a specially c rafted page that will submit data to your forum without them knowing
Remote form submission from other websites or automated programs
Brute force hacking. This is more important on a login page where an automated program will keep submitting the form until it gets the password right

There are also lots of other things that having CAPTCHA on a form also prevents.

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