here is the php graphic script i use to generate images on the fly. php.net has tons more!!
in this php file you could create an algorithm that generates a random sequence of letters, encrypt it, and then have the image decrypt word and print?? if that makes any sense.
<?
header ("Content-type: image/png");
$im = @ImageCreate (400, 75) or die ("Cannot Initialize new GD image stream");
$input = $_GET["input"];
$font = "/usr/X11R6/lib/X11/fonts/drakfont/ttf/sylfaen.ttf";
$background_color = ImageColorAllocate ($im, 255, 255, 255);
$text_color = ImageColorAllocate ($im, 233, 14, 91);
ImageTTFText($im, 60, 0, 10, 55, $text_color, $font, $input);
Imagepng ($im);
Imagedestroy($im);
?>
//?input=
//and u might want to change the font location to suit ur needs.
so, to use this script, type in
filename.php?input=text
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