data returned. The
      <TT
CLASS="FILENAME"
>pg_hba.conf</TT
> file allows administrators to specify
      which hosts can use non-encrypted connections (<TT
CLASS="LITERAL"
>host</TT
>)
      and which require SSL-encrypted connections
      (<TT
CLASS="LITERAL"
>hostssl</TT
>). Also, clients can specify that they
      connect to servers only via SSL. <SPAN
CLASS="APPLICATION"
>Stunnel</SPAN
> or
      <SPAN
CLASS="APPLICATION"
>SSH</SPAN
> can also be used to encrypt transmissions.
     </P
></DD
><DT
