On Mon, August 14, 2006 3:32 am, Julio B. wrote:
> Hay muchos y muy variados en Internet. En alguna ocasión he usado el
> que
> viene en sBlog. Es muy sencillo de implementar y para la mayoría de
> los
> casos suficiente para evitarnos problemas de spam.
>
> En código es:
>
> <?php
>
> $key = (array_key_exists('k', $_GET) && strlen($_GET['k']) == 4) ?
> $_GET['k'] : strtolower(substr(md5(rand()), 0, 4));
>
> $im = imagecreatetruecolor(40, 20);
>
> $bg = imagecolorallocate($im, 0, 0, 0);
> $col_text = imagecolorallocate($im, 255, 255, 255);
>
> imagestring($im, 4, 4, 1, $key, $col_text);
>
> header('Content-type: image/png');
> imagepng($im);
> imagedestroy($im);
>
> ?>
I can't read Spanish and am probably not answering your question, but
if you are passing in ?k=ABCD and the image just contains ABCD, then
the Bad Guy only has to see the URL and figure out how to get ABCD to
break your CAPTCHA...
Here is a very crude minimalistic example CAPTCHA implementation that
you may find useful:
http://voodookings.net/eyesonly_example.htm
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