[GitnMeSumCash]

Not sure who all can use this effectively but I figured someone could..

I came across this Captcha Bypass in PHP.. let me know what you think... code is bleow. Enjoy!


<?php

// CAPTCHA Bypass Code (Works 99%)
//
//
// Location: http://www.URLTOBYPASS/captcha/captcha.php
//

function imageconverttruecolor(&$image)
{
$width = imagesx($image); $height = imagesy($image);
$final = imagecreatetruecolor($width, $height);
imagecopy($final, $image, 0, 0, 0, 0, $width, $height);
imagedestroy($image);
$image = $final;
}

// load images
$background = imagecreatefrompng("captcha.png");
$lettersimg = imagecreatefrompng("letters.png");
$captcha = imagecreatefrompng("http://www.URLTOBYPASS/captcha/captcha.php");
imageconverttruecolor($background);
imageconverttruecolor($lettersimg);
imageconverttruecolor($captcha);

// first parse - difference test and pixel save
$pixels = array();
for($x = 0; $x < imagesx($captcha); $x++){
for($y = 0; $y < imagesy($captcha); $y++){
$src = imagecolorat($background, $x, $y);
$dst = imagecolorat($captcha, $x, $y);
if(!($src == 0 && $dst == 0) && ($src == $dst))
$pixels[$x][$y] = 0xFFFFFF;
else $pixels[$x][$y] = 0x000000;
}
}
imagedestroy($background);

// second parse - filter out pixel noise
for($p = 0; $p < 3; $p++){ // 3 noise parses
for($x = 0; $x < imagesx($captcha); $x++){
for($y = 0; $y < imagesy($captcha); $y++){
$filterpixel = true;
if(!$pixels[$x-1][$y-1] && !$pixels[$x+0][$y-1] && !$pixels[$x+1][$y-1]) $filterpixel = false; // top
if(!$pixels[$x+1][$y-1] && !$pixels[$x+1][$y+0] && !$pixels[$x+1][$y+1]) $filterpixel = false; // right
if(!$pixels[$x-1][$y+1] && !$pixels[$x+0][$y+1] && !$pixels[$x+1][$y+1]) $filterpixel = false; // bottom
if(!$pixels[$x-1][$y-1] && !$pixels[$x-1][$y+0] && !$pixels[$x-1][$y+1]) $filterpixel = false; // left
if($filterpixel) $pixels[$x][$y] = 0xFFFFFF;
}
}
}
for($x = 0; $x < imagesx($captcha); $x++){
$pixels[$x][0] = 0xFFFFFF;
$pixels[$x][1] = 0xFFFFFF;
$pixels[$x][imagesy($captcha) - 1] = 0xFFFFFF;
$pixels[$x][imagesy($captcha) - 2] = 0xFFFFFF;
}
for($y = 0; $y < imagesy($captcha); $y++){
$pixels[0][$y] = 0xFFFFFF;
$pixels[1][$y] = 0xFFFFFF;
$pixels[imagesx($captcha) - 1][$y] = 0xFFFFFF;
$pixels[imagesx($captcha) - 2][$y] = 0xFFFFFF;
}
for($x = 50; $x < 54; $x++){
for($y = 2; $y < 5; $y++){
$pixels[$x][$y] = 0xFFFFFF;
}
}

// third parse - rebuild image (just for show)
for($x = 0; $x < imagesx($captcha); $x++){
for($y = 0; $y < imagesy($captcha); $y++){
imagesetpixel($captcha, $x, $y, 0xFFFFFF);
if(($x % 3) == 0 && ($y % 3) == 0 && $pixels[$x][$y] == 0){
imagesetpixel($captcha, $x, $y, 0xFF0000);
}
}
}

// fourth parse - basic ocr (slow) :-(
$letters = 'ABCE'; $ocr = '';
for($x1 = 0; $x1 < imagesx($captcha) - 25; $x1++){
for($y1 = 0; $y1 < imagesy($captcha) - 27; $y1++){
$score = array();
for($letter = 0; $letter < 4; $letter++){
for($x2 = 0; $x2 < 25; $x2++){
for($y2 = 0; $y2 < 27; $y2++){
$color = imagecolorat($lettersimg, ($letter * 25) + $x2, $y2);
if($pixels[$x1 + $x2][$y1 + $y2] == $color && $color == 0) $score[$letter][0]++;
if($color == 0) $score[$letter][1]++;
}
}
}
$found = -1; $highest = 0;
for($letter = 0; $letter < 4; $letter++){
$result = (($score[$letter][1] / 100) * 90);
if($score[$letter][0] >= $result){
$result = ($score[$letter][0] - $result);
if($result > $highest){
$highest = $result;
$found = $letter;
}
}
}
if($found > -1){
$ocr .= $letters[$found];
$x1 += 10;
}
unset($score);
}
}
imagedestroy($lettersimg);
unset($pixels);

// last of all output
header('Content-Type: image/png');
imagestring($captcha, 2, 0, 0, $ocr, 0);
imagepng($captcha);
imagedestroy($captcha);

?>

[theguy200]

That won't do any good, as it only works for a certain forum's captcha, it wouldn't work on complex ones like club live and etc.