ULL-MD5</code> ciphers.  However,
    a man-in-the-middle could read and pass communications between client
    and server.  Also, encryption overhead is minimal compared to the
    overhead of authentication.  For these reasons NULL ciphers are not
    recommended.
   </p></div></div><div class="sect2" id="SSL-CLIENT-CERTIFICATES"><div class="titlepage"><div><div><h3 class="title">19.9.3. Using Client Certificates <a href="#SSL-CLIENT-CERTIFICATES" class="id_link">#</a></h3></div></div></div><p>
   To req