Three ways to test Web form input with a CAPTCHA

Monday, 14 April 2008, 8:53 PM EST

Many Web forms these days feature a Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) as an effort to stop people from setting up computers to automatically fill in Web forms. A typical CAPTCHA is an image with some numbers and letters in it with distortion and/or background noise, and a Web form input field where you are to enter the numbers and letters from the image. This article investigates three CAPTCHA applications that you can use on a PHP Web site.

At Linux.com

[ Read more ]





Spotlight

A closer look at Mega cloud storage

Posted on 21 May 2013.  |  Once a novelty, nowadays many cloud storage services are fighting for their piece of the market in the virtual world. Mega offers 50GB of free space with great pricing on Pro accounts.


Daily digest

By subscribing to our early morning news update, you will receive a daily digest of the latest security news published on Help Net Security.
  

Weekly newsletter

With over 500 issues so far, reading our newsletter every Monday morning will keep you up-to-date with security risks out there.
  

 
DON'T
MISS

Wed, May 22nd
    COPYRIGHT 1998-2013 BY HELP NET SECURITY.   // READ OUR PRIVACY POLICY // ABOUT US // ADVERTISE //