$_GET PHP...

http://www.manuelphp.com/php/function.md5.php 
https://www.php.net/manual/fr/function.md5.php

<form name="envoi_mdp" enctype="multipart/form-data" method="post" action="page2.php">  
<input type="password" name"pass" />  

<?php   
if (!empty ($_POST['pass'])) {  
   $password=$_POST['pass'];  
   if ($password == pomme) {   
    contenus de la page   
    }   
   else {  
  echo "mauvais password" ;  
  }   
} 
else {   
aucun mot de passe entré }