Apply the following patch to have a ssl enabled scuttle installation. See also sourceforge patch tracker:
--- header.inc.php.orig 2006-04-28 20:38:03.000000000 +0200 +++ header.inc.php 2006-04-28 20:45:26.000000000 +0200 @@ -19,7 +19,12 @@ } if (($root != '/') && (substr($root, -1, 1) != '/')) $root .= '/'; - $root = 'http://'. $_SERVER['HTTP_HOST'] . $root; + + if(isset($_SERVER['HTTPS'])) + $root = 'https://' . $_SERVER['HTTP_HOST'] . $root; + else + $root = 'http://' . $_SERVER['HTTP_HOST'] . $root; + } // Handle cookies