Forms with letter security

I have a set of graphical letters A to Z. I want some displayed and
then keyed into a security field to verify a person is submitting the
form. I have seen these used before on shopping carts.

I know about creating salts to select which letters to choose.

What I am wondering is if there is a way to join the letters together
instead of having 6 different images displayed.

Ron

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Re: Forms with letter security

Hello,

on 06/17/2006 02:46 AM Ron Piggott (PHP) said the following:
> I have a set of graphical letters A to Z. I want some displayed and
> then keyed into a security field to verify a person is submitting the
> form. I have seen these used before on shopping carts.
>
> I know about creating salts to select which letters to choose.
>
> What I am wondering is if there is a way to join the letters together
> instead of having 6 different images displayed.

Usually that is done by generating dynamically a single image using the
GD extension.

You may want to take a look at this forms generation class to perform
that kind of validation. It generates an image with a random text and a
noise image to make the text a little fuzzy and harder to crack by robots.

Here is a screenshot of the text:

http://www.phpclasses.org/browse/file/8244.html

Take a look at the test_captcha_input.php example script to learn how
the class can simplify this task for you using this plug-in:

http://www.phpclasses.org/formsgeneration


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Regards,
Manuel Lemos

Metastorage - Data object relational mapping layer generator
http://www.metastorage.net/

PHP Classes - Free ready to use OOP components written in PHP
http://www.phpclasses.org/

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