diff --git a/static/admin.html b/static/admin.html
index 7403b81..3928d35 100644
--- a/static/admin.html
+++ b/static/admin.html
@@ -26,11 +26,20 @@
 	<div id="map"></div><br/>
 
 	<input id="popup"/><button id="sendPopup">Send popup to all clients</button><br/>
+    <button id="genCode">Generate invisibility code</button><div id="code"></div><br/>
 
 	<script type="text/javascript">
 		//////////////////////////////////////////////////////////////////////////////
 		// SETUP MAP
-
+        function makeCode() {
+            var result           = '';
+            var characters       = 'abcdefghijklmnopqrstuvwxyz0123456789';
+            var charactersLength = characters.length;
+            for ( var i = 0; i < 10; i++ ) {
+              result += characters.charAt(Math.floor(Math.random() * charactersLength));
+           }
+           return result;
+        }
 		setup_map();
 
 		map.on("dblclick", function(data){
@@ -74,10 +83,15 @@
 
 		document.querySelector('#sendPopup').addEventListener('click', function(){
 			const input = document.querySelector('#popup');
-
 			socket.emit("popup", {"content": input.value});
 		});
 
+        document.querySelector('#genCode').addEventListener('click', function(){
+            var code = makeCode();
+            socket.emit('newCode', {"code":code});
+            document.getElementById("code").innerHTML = code;
+        });
+
 	</script>
 </body>
 </html>
diff --git a/traque.js b/traque.js
index 4dda034..48c95e7 100644
--- a/traque.js
+++ b/traque.js
@@ -20,14 +20,14 @@ Les messages à transmettre par le serveur :
 // Textes d'interaction avec les conscrits
 var PWD_TRACKED = "tracked";
 var PWD_TRACKER = "tracker";
-var PWD_INVISIBLE = "invisible";
-var MSG_BAD = "La base n'a pas compris votre message...";
+var MSG_BAD = "Code Incorrect";
 var MSG_TRACKED = "Vous êtes maintenant traqué.e.s !"
 var MSG_TRACKER = "Vous pouvez maintenant traquer !";
 var MSG_INVISIBLE = "Les autres équipes ne peuvent plus vous voir !";
 
 var equipes = [];
 var admins = [];
+var invisi = {};
 
 // require = include
 var http = require('https');//require('http');
@@ -118,7 +118,8 @@ io.sockets.on('connection', function(socket){
             d.color = 1;
             socket.emit('popup', {"content": MSG_TRACKER});
         }
-        else if(d.content == PWD_INVISIBLE){
+        else if((d.content in invisi) && invisi[d.content]){
+            invisi[d.content] = false;
             d.color = -1;
             socket.emit('popup', {"content": MSG_INVISIBLE});
         } else {
@@ -146,6 +147,9 @@ io.sockets.on('connection', function(socket){
         for(i in equipes)
             equipes[i].emit('setName', {"id": socket.id, "name": d.name});
     });
+    socket.on('newCode', function(d){
+        invisi[d.code] = true;
+    });
     socket.on("disconnect", function(_){
 	console.log(socket.id + " disconnect"); 
 	socket.shown = false;