 client/server communications
   for increased security. This requires that
   <span class="productname">OpenSSL</span> is installed on both client and
   server systems and that support in <span class="productname">PostgreSQL</span> is
   enabled at build time (see <a class="xref" href="installation.html" title="Chapter 17. Installation from Source Code">Chapter 17</a>).
  </p><p>
   The terms <acronym class="acronym">SSL</acronym> and <acronym class="acronym">TLS</acronym> are often used
   interchange