<?php
if(isset($_GET['submit_pass']))
{
    $key = "key{XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX}";
    $pass = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
    if (strcasecmp($_GET['pass'], $pass) == 0)
    {
       echo '<p><strong>Your key is below:</strong><br/>'.$key.'</p>';
    }
    else
    {
        echo '<p><span style="color:red;">Wrong password!</span></p>';
    }
}
?>
<form method="get">
    <label>Password:</label>
<input type="text" name="pass" />
<input type="submit" name="submit_pass" value="Submit" />