Postgres also permits ssl encrypted connections. One of my typical connection modules include this function:

sub connect {
  my $self = shift;
  my $db = shift;

  my $db_driver = $db->{'db_driver'};
  my $host_name = $db->{'db_host'};
  my $db_name = $db->{'db_name'};
  my $USER = $db->{'db_user'};
  my $PASSWORD = $db->{'db_pw'};

  my $dsn = "DBI:$db_driver:host=$host_name;database=$db_name";
  if($db->{'db_ssl'}){
    $dsn .= ';sslmode=require';
  }

  # print $dsn,"\n";

   return (DBI->connect($dsn,$USER,$PASSWORD,
      {PrintError => 0, RaiseError => 1}));
}
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while my /etc/postgres/8.1/main/pg_hba.conf, includes:

# local      DATABASE  USER  METHOD  [OPTION]
# host       DATABASE  USER  CIDR-ADDRESS  METHOD  [OPTION]
# hostssl    DATABASE  USER  CIDR-ADDRESS  METHOD  [OPTION]
# hostnossl  DATABASE  USER  CIDR-ADDRESS  METHOD  [OPTION]

hostssl db_name db_user   192.168.105.45/32       md5
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-- Hugh