Posted by Chris Shiflett on 06/07/05 16:00

Merlin wrote:
> I am getting more and more emails through my webforms submited by bots.
> It looks like some sites liky yahoo are placing an image into their
> forms and the human has to enter a code visible on the image to submit
> the form. After some googling I found captcha, but I do not like the
> images.
>
> Do you know if there is a class available for PHP which does create the
> image and does parts of the handling?

You might find this helpful:

http://phpsec.org/articles/2005/text-captcha.html

It uses an image, and there are valid complaints against such. Of
course, you could also argue that CAPTCHA has very little to do with
security, and I'd have to agree. :-)

Other approaches include asking a simple question that any user will
know and throttling requests from the same client to restrain the scope
of the problem.

Hope that helps.

Chris

--
Chris Shiflett
Brain Bulb, The PHP Consultancy
http://brainbulb.com/

• Next in forum: Re: [PHP] The "goto" discussion on the Internals List
• Prev in forum: Nameserver lookup
• Thread view: Re: [PHP] Telling users and machines apart

[Reply to this message]