13,15d12
< 		if (!ctype_xdigit($etag)) {
< 			die("");
< 		}
18c15
< 		$etag = substr(sha1($secret . rand()), 0, 18);
---
> 		$etag = substr(sha1($secret . sha1($_SERVER["REMOTE_ADDR"]) . sha1($_SERVER["HTTP_USER_AGENT"])), 0, 18);
60,85c57,59
< 		header("Content-type: image/png");
< 
< 		$im = imagecreatetruecolor(400, 60);
< 
< 		// Create some colors
< 		$white = imagecolorallocate($im, 255, 255, 255);
< 		$grey = imagecolorallocate($im, 128, 128, 128);
< 		$black = imagecolorallocate($im, 0, 0, 0);
< 		imagefilledrectangle($im, 0, 0, 399, 59, $white);
< 
< 		// The text to draw
< 		$text = 'visitor id: ' . $etag;
< 		// Replace path by your own font path
< 		$font = './font.ttf';
< 
< 		// Add some shadow to the text
< 		//imagettftext($im, 15, 0, 11, 21, $grey, $font, $text);
< 		// Add the text
< 		imagettftext($im, 15, 0, 10, 20, $black, $font, $text);
< 		$text = "number visits: " . $session["visits"];
< 		imagettftext($im, 15, 0, 10, 50, $black, $font, $text);
< 
< 		// Using imagepng() results in clearer text compared with imagejpeg()
< 		imagepng($im);
< 		imagedestroy($im);
< 
---
> 		header("Content-type: image/jpeg");
> 		header("Content-length: " . filesize("fingerprinting.jpg"));
> 		readfile("fingerprinting.jpg");