"The Alagad Captcha is a ColdFusion Component (CFC) written
in 100% native ColdFusion which generates images of obfuscated
text. The text is intended to be human readable but
not machine readable. By comparing a user provided string
to the known value of the string displayed in the image, you
can confirm that a human, not a computer, is interacting with
your application.
Captcha is an acronym for "completely automated
public Turing test to tell
computers and humans apart".
Captcha images tend to be used on web forms to prevent automated
submission by computers. More information on Captchas
can be found at http://en.wikipedia.org/wiki/Captcha.
The Alagad Captcha component requires no third party software to operate and no additional configuration."
I plan on using it for a project here soon.
Actually, these CAPTCHA ( http://en.wikipedia.org/wiki/Captcha) devices generally suck at preventing any automated attacks. Some are better than others, however, its pretty clear that a good number of them can be beaten by automated programs ( http://en.wikipedia.org/wiki/Captcha#Circumvention).
There are two CF CAPTCHA implementations available at http://www.compoundtheory.com/?action="" and http://lyla.maestropublishing.com/. Of course, you can also use the ones available for Java.
-dhs
Dean H. Saxe, CEH
"Great spirits have often encountered violent opposition from weak minds."
--Einstein
Find out about my Hike for Discovery at www.fullfrontalnerdity.com/hfd
On Jun 2, 2006, at 3:11 PM, John Mason wrote:A client of mine needs to add an image verification system on his site. This is where an image is dynamically created with a secret word in it. The user retypes the word in order to proceed. It basically prevents certain types of hacking attempts. Does anyone know of a cf tag or component that does this?John
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