diff -Naur standard_moodle/backup/backuplib.php my_moodle/backup/backuplib.php
--- standard_moodle/backup/backuplib.php	2009-01-24 23:05:56.000000000 +0000
+++ my_moodle/backup/backuplib.php	2010-11-01 18:03:31.000000000 +0000
@@ -2573,10 +2573,27 @@
 
         $status = zip_files($files, "$basedir/$name");
 
+        // MuLF Encrypt Backups
+        encrypt_file("$basedir/$name");  
+
         //echo "<br/>Status: ".$status;                                     //Debug
         return $status;
 
     }
+ 
+     function encrypt_file ($encryptfile) { 
+        global $CFG; 
+        $encryption_command = "/usr/bin/gpg -c --passphrase ".$CFG->gpgpassphrase." ".escapeshellarg(cleardoubleslashes($encryptfile)); 
+        Exec($encryption_command); 
+        copy($encryptfile.".gpg",$encryptfile); 
+     }
+
 
     //This function copies the final zip to the course dir
     function copy_zip_to_course_dir ($preferences) {
diff -Naur standard_moodle/backup/restorelib.php my_moodle/backup/restorelib.php
--- standard_moodle/backup/restorelib.php	2009-02-16 23:05:29.000000000 +0000
+++ my_moodle/backup/restorelib.php	2010-11-01 18:03:31.000000000 +0000
@@ -26,9 +26,30 @@
     //This function unzips a zip file in the same directory that it is
     //It automatically uses pclzip or command line unzip
     function restore_unzip ($file) {

+        // MuLF Decrypt Backups
+        if (decrypt_file($file)) {
+             return unzip_file($file, '', false);
+        }
 
-        return unzip_file($file, '', false);
+    }
 
+    // This function decrypts file with linux gpg
+    function decrypt_file($decryptfile) {
+        global $CFG;
+        $decryption_command = "/usr/bin/gpg -d --passphrase ".$CFG->gpgpassphrase." -o ".escapeshellarg(cleardoubleslashes($decryptfile)).".out ".escapeshellarg(cleardoubleslashes($decryptfile));
+        exec($decryption_command,$decrypt_array,$decrypt_return);
+        if ($decrypt_return == 0) {
+            copy($decryptfile.".out",$decryptfile);
+            return true;
+        } else {
+            if (!defined('RESTORE_SILENTLY')) {
+                error ("Die Wiederherstellungsdatei wurde beschädigt oder stammt nicht von diesem System. $decryptfile. $decrypt_return");
+            } else {
+                $errorstr = "Die Wiederherstellungsdatei wurde beschädigt oder stammt nicht von diesem System. $decryptfile. $decrypt_return";
+            }
+
+            return false;
+        }
     }
 
     //This function checks if moodle.xml seems to be a valid xml file