diff --git a/SCR3.2/TP04/ddns.key b/SCR3.2/TP04/ddns.key
new file mode 100644
index 0000000..e68ec6e
--- /dev/null
+++ b/SCR3.2/TP04/ddns.key
@@ -0,0 +1,4 @@
+key "tp.scr-key" {
+        algorithm hmac-md5;
+        secret "isfoZ1noj0MAJUxImFn1ZQ==";
+};
diff --git a/SCR3.2/TP04/isis-dhcpd.conf b/SCR3.2/TP04/isis-dhcpd.conf
new file mode 100644
index 0000000..f269aa0
--- /dev/null
+++ b/SCR3.2/TP04/isis-dhcpd.conf
@@ -0,0 +1,16 @@
+subnet 192.168.1.0 netmask 255.255.255.0 {
+    range 192.168.1.11 192.168.1.254;
+    option domain-name "tp.scr";
+    option domain-name-servers 192.168.1.158;
+    option routers 192.168.1.10;
+    default-lease-time 600;
+    max-lease-time 7200;
+    zone tp.scr. 
+    {
+        primary 192.168.1.158;
+    }
+    zone 1.168.192.in-addr.arpa. 
+    {
+        primary 192.168.1.158;
+    }
+}
\ No newline at end of file
diff --git a/SCR3.2/TP04/osiris.db.tp.scr b/SCR3.2/TP04/osiris.db.tp.scr
index f1426cd..dbc2aaf 100644
--- a/SCR3.2/TP04/osiris.db.tp.scr
+++ b/SCR3.2/TP04/osiris.db.tp.scr
@@ -3,7 +3,7 @@
 ;
 $TTL    604800
 @       IN      SOA     osiris.tp.scr. root.tp.scr. (
-                              2         ; Serial
+                              3         ; Serial
                          604800         ; Refresh
                           86400         ; Retry
                         2419200         ; Expire
@@ -11,7 +11,4 @@ $TTL    604800
 ;
 @       IN      NS      osiris.tp.scr.
 osiris.tp.scr.       IN      A       192.168.1.158
-eno.tp.scr.       IN      A       192.168.1.1
-owt.tp.scr.       IN      A       192.168.1.2
-eerht.tp.scr.       IN      A       192.168.1.3
-ruof.tp.scr.       IN      A       192.168.1.4
+isis.tp.scr.         IN      A       192.168.1.10
\ No newline at end of file
diff --git a/SCR3.2/TP04/osiris.db.tp.scr.inv b/SCR3.2/TP04/osiris.db.tp.scr.inv
index 0134bc3..5657ed8 100644
--- a/SCR3.2/TP04/osiris.db.tp.scr.inv
+++ b/SCR3.2/TP04/osiris.db.tp.scr.inv
@@ -3,7 +3,7 @@
 ;
 $TTL    604800
 @       IN      SOA     osiris.tp.scr. root.tp.scr. (
-                              1         ; Serial
+                              2         ; Serial
                          604800         ; Refresh
                           86400         ; Retry
                         2419200         ; Expire
@@ -11,7 +11,4 @@ $TTL    604800
 ;
 @       IN      NS      osiris.tp.scr.
 158.1.168.192.in-addr.arpa  IN      PTR     osiris.tp.scr.
-1.1.168.192.in-addr.arpa  IN      PTR     eno.tp.scr.
-2.1.168.192.in-addr.arpa  IN      PTR     owt.tp.scr.
-3.1.168.192.in-addr.arpa  IN      PTR     eerht.tp.scr.
-4.1.168.192.in-addr.arpa  IN      PTR     ruof.tp.scr.
+10.1.168.192.in-addr.arpa   IN      PTR     isis.tp.scr.
\ No newline at end of file
diff --git a/SCR3.2/TP04/osiris.named.conf.local b/SCR3.2/TP04/osiris.named.conf.local
index da55712..ae25851 100644
--- a/SCR3.2/TP04/osiris.named.conf.local
+++ b/SCR3.2/TP04/osiris.named.conf.local
@@ -1,19 +1,35 @@
-//
-// Do any local configuration here
-//
+include "/etc/bind/ddns.key";
 
-// Consider adding the 1918 zones here, if they are not used in your
-// organization
-//include "/etc/bind/zones.rfc1918";
+//SANS CLE
 
 zone "tp.scr"
 {
-type master;
-file "/etc/bind/db.tp.scr";
+    type master;
+    file "/etc/bind/db.tp.scr";
+    allow-update { 192.168.1.10; };
+};
+zone "1.168.192.in-addr.arpa"
+{
+    type master;
+    file "/etc/bind/db.tp.scr.inv";
+    allow-update { 192.168.1.10; };
+};
+
+//Avec CLE
+zone "tp.scr"
+{
+    type master;
+    // 2. Modification du chemin vers le répertoire inscriptible pour DDNS (I.4)
+    file "/var/cache/bind/db.tp.scr"; 
+    // 3. Ajout de la clause allow-update avec la clé TSIG (II.2)
+    allow-update { key "tp.scr-key"; }; 
 };
 
 zone "1.168.192.in-addr.arpa"
 {
-type master;
-file "/etc/bind/db.tp.scr.inv";
+    type master;
+    // 2. Modification du chemin vers le répertoire inscriptible pour DDNS (I.4)
+    file "/var/cache/bind/db.tp.scr.inv";
+    // 3. Ajout de la clause allow-update avec la clé TSIG (II.2)
+    allow-update { key "tp.scr-key"; };
 };
\ No newline at end of file