   </td></tr><tr><td><code class="attributeName">key</code></td><td>
        <p>The secret key used by digest authentication. If not set, a secure
        random value is generated. This should normally only be set when it is
        necessary to keep key values constant either across server restarts
        and/or across a cluster.</p>
      </td></tr><tr><td><code class="attributeName">nonceCacheSize</code></td><td>
        <p>To protect against replay attacks, the DIGEST authenticator tracks
        serv