diff -aur pukiwiki-1.4.7_notb/lib/html.php pukiwiki/lib/html.php
--- pukiwiki-1.4.7_notb/lib/html.php    2006-04-16 02:33:35.000000000 +0900
+++ pukiwiki/lib/html.php       2009-03-07 14:59:59.000000000 +0900
@@ -248,6 +248,7 @@
   <textarea name="msg" rows="$rows" cols="$cols">$s_postdata</textarea>
   <br />
   <div style="float:left;">
+   合い言葉：<input type="text" name="password" />(巻物の記号をどうぞ)<br />
    <input type="submit" name="preview" value="$btn_preview" accesskey="p" />
    <input type="submit" name="write"   value="$_btn_update" accesskey="s" />
    $add_top
diff -aur pukiwiki-1.4.7_notb/plugin/edit.inc.php pukiwiki/plugin/edit.inc.php
--- pukiwiki-1.4.7_notb/plugin/edit.inc.php     2006-03-21 23:26:25.000000000 +0900
+++ pukiwiki/plugin/edit.inc.php        2009-03-07 15:30:14.000000000 +0900
@@ -178,6 +178,8 @@
        global $_title_collided, $_msg_collided_auto, $_msg_collided, $_title_deleted;
        global $notimeupdate, $_msg_invalidpass, $do_update_diff_table;

+       if ($vars['password'] != '?') die_message('Unmatch password');
+
        $page   = isset($vars['page'])   ? $vars['page']   : '';
        $add    = isset($vars['add'])    ? $vars['add']    : '';
        $digest = isset($vars['digest']) ? $vars['digest'] : '';