Posted by Manuel Lemos on 11/04/06 13:05

Hello,

on 11/03/2006 07:49 PM Barry Morris said the following:
> Hello
>
> One web site I have written has a 'register your interest' form which simply
> e-mails the data, this is working fine except some people seem to get off on
> repeatedly using the form to send phoney data. I guess this is from some
> kind of web-bot so I would like to attempt to program around this problem.
>
> One solution is using a distorted image of some letters (CAPTCHA?), however
> I was wondering if anybody has chosen a simpler method, and whether my
> simple method would be impervious to web-bots?
>
> 1/ Generate a random string of letters
> 2/ Ask the user to select from 3 combo boxes 3 random positions, e.g. select
> letters 2, 6 and 7 from LKJIUVBJH.

Most Web bots hackers would not bother to defeat simple CAPTCHAs unless
the benefits of defeating it as very high.

If you want to have CAPTCHA validation integrated in forms with other
fields that have their own types of validation, you may want to try this
forms generation and validation class that comes with a plug-in to
implement a CAPTCHA control with almost no effort:

http://www.phpclasses.org/formsgeneration

--

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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