PHP - Php Encription

Hi I have used md5 encription on my websites for security. Passwords for example. Also passing information between pages also. I have been seing on some websites that require email validatin the following ...

?id=CJmEifn7tM_l2gEQy8yKxLyc0MBa&hl

This is not md5 is this a new and more secure encription? Seems to have upper and lower case as well as other symbols.

TIA

Desmond.

Im using SMF forum
im trying to connect (my software C#)  and grand access from forum DB
this is a hash from SMF
 sha1(strtolower($membername) . $password);


Code: [Select]

<?php
include("config.php");

$user = "-1";
if (isset($_GET['user'])) {
  $user = $_GET['user'];
}
$pass = "-1";
if (isset($_GET['pass'])) {
  $pass = $_GET['pass'];
}

$ip = $_SERVER['REMOTE_ADDR']; 

$sql = "select id_member,count from smf_members where real_name='$user' and passwd=MD5('$pass')";
$results = mysql_query($sql, $con);
$values = mysql_fetch_assoc($results);
$user_id = $values['id_member'];
$login=$values['count'];

?>


MD5 working fine but how to use SMF hash to login?