Index: wp-includes/pluggable.php
===================================================================
--- wp-includes/pluggable.php	(revision 6350)
+++ wp-includes/pluggable.php	(working copy)
@@ -697,7 +697,12 @@
 	if ( empty($salt) )
 		$salt = DB_PASSWORD . DB_USER . DB_NAME . DB_HOST . ABSPATH;
 
-	return $salt;
+	if ( ! defined('SECRET_KEY') )
+		$secret_key = 'shhhh';
+	else
+		$secret_key = SECRET_KEY;
+		
+	return $salt . $secret_key;
 }
 endif;
 
Index: wp-config-sample.php
===================================================================
--- wp-config-sample.php	(revision 6349)
+++ wp-config-sample.php	(working copy)
@@ -6,6 +6,7 @@
 define('DB_HOST', 'localhost');    // 99% chance you won't need to change this value
 define('DB_CHARSET', 'utf8');
 define('DB_COLLATE', '');
+define('SECRET_KEY', 'shhhh'); // Change this to something unique
 
 // You can have multiple installations in one database if you give each a unique prefix
 $table_prefix  = 'wp_';   // Only numbers, letters, and underscores please!