diff --git a/scripts/install b/scripts/install
index cd129e5..1a4abda 100755
--- a/scripts/install
+++ b/scripts/install
@@ -58,6 +58,22 @@ ynh_app_setting_set --app=$app --key=is_public --value=$is_public
 ynh_app_setting_set --app=$app --key=group_name --value=$group_name
 ynh_app_setting_set --app=$app --key=password --value=$password
 
+#=================================================
+# CREATE A DH FILE
+#=================================================
+ynh_script_progression --message="Creating a dh file..." --weight=3
+
+# WARNING : theses command are used in INSTALL, UPGRADE, RESTORE
+# For any update do it in all files
+
+# Make dh cert for synapse if it doesn't exist
+if [ ! -e /etc/ssl/private/dh2048.pem ]
+then
+    ynh_exec_warn_less openssl dhparam -out /etc/ssl/private/dh2048.pem -outform PEM -2 2048 -dsaparam
+    chown root:ssl-cert /etc/ssl/private/dh2048.pem
+    chmod 640 /etc/ssl/private/dh2048.pem
+fi
+
 #=================================================
 # STANDARD MODIFICATIONS
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 64795ee..4a0b859 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -123,6 +123,22 @@ yunohost service add coturn-$app --needs_exposed_ports $turnserver_tls_port
 
 ynh_restore_file --logfile "/var/log/$app"
 
+#=================================================
+# CREATE A DH FILE
+#=================================================
+ynh_script_progression --message="Creating a dh file..." --weight=3
+
+# WARNING : theses command are used in INSTALL, UPGRADE, RESTORE
+# For any update do it in all files
+
+# Make dh cert for synapse if it doesn't exist
+if [ ! -e /etc/ssl/private/dh2048.pem ]
+then
+    ynh_exec_warn_less openssl dhparam -out /etc/ssl/private/dh2048.pem -outform PEM -2 2048 -dsaparam
+    chown root:ssl-cert /etc/ssl/private/dh2048.pem
+    chmod 640 /etc/ssl/private/dh2048.pem
+fi
+
 #=================================================
 # RECONFIGURE THE TURNSERVER
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 78f0b97..e3cb11f 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -138,6 +138,22 @@ then
     ynh_use_logrotate --logfile /var/log/matrix-$app --nonappend
 fi
 
+#=================================================
+# CREATE A DH FILE
+#=================================================
+ynh_script_progression --message="Creating a dh file..." --weight=3
+
+# WARNING : theses command are used in INSTALL, UPGRADE, RESTORE
+# For any update do it in all files
+
+# Make dh cert for synapse if it doesn't exist
+if [ ! -e /etc/ssl/private/dh2048.pem ]
+then
+    ynh_exec_warn_less openssl dhparam -out /etc/ssl/private/dh2048.pem -outform PEM -2 2048 -dsaparam
+    chown root:ssl-cert /etc/ssl/private/dh2048.pem
+    chmod 640 /etc/ssl/private/dh2048.pem
+fi
+
 #=================================================
 # SPECIFIC UPGRADE
 #=================================================