diff --git a/actions.toml b/actions.toml
index fdbb619..9b10324 100644
--- a/actions.toml
+++ b/actions.toml
@@ -21,15 +21,3 @@ name = "Reset the config file and restore a default one."
 command = "/bin/bash scripts/actions/reset_default_config \"lutim.conf\""
 accepted_return_codes = [0]
 description = "Reset the config file lutim.conf."
-
-[public_private]
-name = "Move to public or private"
-command = "/bin/bash scripts/actions/public_private"
-accepted_return_codes = [0]
-description = "Change the public access of the app."
-
-    [public_private.arguments]
-        [public_private.arguments.is_public]
-            type = "boolean"
-            ask = "Is it a public app ?"
-            default = true
diff --git a/config_panel.toml b/config_panel.toml
index 34b1565..2dc90df 100644
--- a/config_panel.toml
+++ b/config_panel.toml
@@ -24,14 +24,6 @@ name = "Lutim configuration"
         default = "Year"
         help = "Users won't be able to ask Lutim to download images more than one per anti_flood_delay seconds."
 
-    [main.is_public]
-    name = "Public access"
-
-        [main.is_public.is_public]
-        ask = "Is it a public website?"
-        type = "boolean"
-        default = true
-
     [main.overwrite_files]
     name = "Overwriting config files"
 
diff --git a/hooks/post_app_addaccess b/hooks/post_app_addaccess
new file mode 100644
index 0000000..2218b35
--- /dev/null
+++ b/hooks/post_app_addaccess
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# Source app helpers
+source /usr/share/yunohost/helpers
+
+app=$1
+added_users=$2
+permission=$3
+added_groups=$4
+
+if [ "$app" == __APP__ ]; then
+    if [ "$permission" = "upload images" ]; then # The fake permission "upload images" is modifed.
+        if [ "$added_groups" = "visitors" ]; then # As is it a fake permission we can only grant/remove the "visitors" group.
+
+            # We remove the regex, no more protection is needed.
+            ynh_app_setting_delete --app=$app --key=protected_regex
+
+            # Sync the is_public variable according to the permission
+            ynh_app_setting_set --app=$app --key=is_public --value=1
+
+            yunohost app ssowatconf
+        else
+            ynh_print_warn --message="This app doesn't support this authorisation, you can only add or remove visitors group."
+        fi
+    fi
+fi
\ No newline at end of file
diff --git a/hooks/post_app_removeaccess b/hooks/post_app_removeaccess
new file mode 100644
index 0000000..d0ca2f7
--- /dev/null
+++ b/hooks/post_app_removeaccess
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Source app helpers
+source /usr/share/yunohost/helpers
+
+app=$1
+removed_users=$2
+permission=$3
+removed_groups=$4
+
+if [ "$app" == __APP__ ]; then
+    if [ "$permission" = "upload images" ]; then # The fake permission "upload images" is modifed.
+        if [ "$removed_groups" = "visitors" ]; then # As is it a fake permission we can only grant/remove the "visitors" group.
+            domain=$(ynh_app_setting_get --app=$app --key=domain)
+            path_url=$(ynh_app_setting_get --app=$app --key=path)
+
+            # If the app is private, viewing images stays publicly accessible.
+            if [ "$path_url" == "/" ]; then
+                # If the path is /, clear it to prevent any error with the regex.
+                path_url=""
+            fi
+            # Modify the domain to be used in a regex
+            domain_regex=$(echo "$domain" | sed 's@-@.@g')
+            ynh_app_setting_set --app=$app --key=protected_regex --value="$domain_regex$path_url/stats/?$","$domain_regex$path_url/manifest.webapp/?$","$domain_regex$path_url/?$","$domain_regex$path_url/[d-m]/.*$"
+
+            # Sync the is_public variable according to the permission
+            ynh_app_setting_set --app=$app --key=is_public --value=0
+
+            yunohost app ssowatconf
+        else
+            ynh_print_warn --message="This app doesn't support this authorisation, you can only add or remove visitors group."
+        fi
+    fi
+fi
\ No newline at end of file
diff --git a/manifest.json b/manifest.json
index 9d761d2..9cf852d 100644
--- a/manifest.json
+++ b/manifest.json
@@ -14,7 +14,7 @@
 		"email": "maniackc_dev@crudelis.fr"
 	},
 	"requirements": {
-		"yunohost": ">= 3.5"
+		"yunohost": ">= 3.7"
 	},
 	"multi_instance": false,
 	"services": [
diff --git a/scripts/actions/public_private b/scripts/actions/public_private
deleted file mode 100755
index 1d166c3..0000000
--- a/scripts/actions/public_private
+++ /dev/null
@@ -1,83 +0,0 @@
-#!/bin/bash
-
-#=================================================
-# GENERIC STARTING
-#=================================================
-# IMPORT GENERIC HELPERS
-#=================================================
-
-source scripts/_common.sh
-source /usr/share/yunohost/helpers
-
-#=================================================
-# RETRIEVE ARGUMENTS
-#=================================================
-
-# Get is_public
-is_public=${YNH_ACTION_IS_PUBLIC}
-
-app=${YNH_APP_INSTANCE_NAME:-$YNH_APP_ID}
-domain=$(ynh_app_setting_get --app=$app --key=domain)
-path_url=$(ynh_app_setting_get --app=$app --key=path)
-
-#=================================================
-# CHECK IF ARGUMENTS ARE CORRECT
-#=================================================
-
-#=================================================
-# CHECK IF AN ACTION HAS TO BE DONE
-#=================================================
-
-is_public_old=$(ynh_app_setting_get --app=$app --key=is_public)
-
-if [ $is_public -eq $is_public_old ]
-then
-	ynh_die --message="is_public is already set as $is_public." --ret_code=0
-fi
-
-#=================================================
-# SPECIFIC ACTION
-#=================================================
-# MOVE TO PUBLIC OR PRIVATE
-#=================================================
-
-if [ $is_public -eq 0 ]; then
-	public_private="private"
-else
-	public_private="public"
-fi
-ynh_script_progression --message="Moving the application to $public_private..." --weight=3
-
-if [ $is_public -eq 0 ]
-then
-	# If the app is private, viewing images stays publicly accessible.
-	if [ "$path_url" == "/" ]; then
-	    # If the path is /, clear it to prevent any error with the regex.
-	    path_url=""
-	fi
-	# Modify the domain to be used in a regex
-	domain_regex=$(echo "$domain" | sed 's@-@.@g')
-    ynh_app_setting_set --app=$app --key=protected_regex --value="$domain_regex$path_url/stats/?$","$domain_regex$path_url/manifest.webapp/?$","$domain_regex$path_url/?$","$domain_regex$path_url/[d-m]/.*$"
-else
-	ynh_app_setting_delete --app=$app --key=protected_regex
-fi
-
-ynh_script_progression --message="Upgrading SSOwat configuration..."
-# Regen ssowat configuration
-yunohost app ssowatconf
-
-# Update the config of the app
-ynh_app_setting_set --app=$app --key=is_public --value=$is_public
-
-#=================================================
-# RELOAD NGINX
-#=================================================
-ynh_script_progression --message="Reloading nginx web server..."
-
-ynh_systemd_action --service_name=nginx --action=reload
-
-#=================================================
-# END OF SCRIPT
-#=================================================
-
-ynh_script_progression --message="Execution completed" --last
diff --git a/scripts/change_url b/scripts/change_url
index 701a082..9fdfded 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -122,7 +122,7 @@ fi
 #=================================================
 ynh_script_progression --message="Reconfiguring SSOwat..."
 
-if [ $is_public -eq 0 ]
+if [ $is_public -eq 0 ] # Only user with a yunohost account can upload an image
 then
 	# If the app is private, viewing images stays publicly accessible.
 	if [ "$new_path" == "/" ]; then
diff --git a/scripts/config b/scripts/config
index 20f6c6b..eef76b6 100644
--- a/scripts/config
+++ b/scripts/config
@@ -61,10 +61,6 @@ else
 fi
 delay="${YNH_CONFIG_MAIN_CONFIGURATION_DELAY:-$old_delay}"
 
-# is_public
-old_is_public="$(ynh_app_setting_get --app=$app --key=is_public)"
-is_public="${YNH_CONFIG_MAIN_IS_PUBLIC_IS_PUBLIC:-$old_is_public}"
-
 # Overwrite settings.json file
 old_overwrite_settings="$(ynh_app_setting_get --app=$app --key=overwrite_settings)"
 overwrite_settings="${YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_SETTINGS:-$old_overwrite_settings}"
@@ -93,8 +89,6 @@ show_config() {
 	ynh_return "YNH_CONFIG_MAIN_CONFIGURATION_ANTIFLOOD=$antiflood"
 	ynh_return "YNH_CONFIG_MAIN_CONFIGURATION_DELAY=$delay"
 
-	ynh_return "YNH_CONFIG_MAIN_IS_PUBLIC_IS_PUBLIC=$is_public"
-
 	ynh_return "YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_SETTINGS=$overwrite_settings"
 	ynh_return "YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_NGINX=$overwrite_nginx"
 	ynh_return "YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_SYSTEMD=$overwrite_systemd"
@@ -154,14 +148,6 @@ apply_config() {
 		ynh_systemd_action --action=restart --line_match="Manager.*started" --log_path="/var/log/$app/production.log" --timeout="120"
 	fi
 
-	# Change public accessibility
-	if [ "$is_public" = "1" ]
-	then
-		yunohost app action run $app public_private --args is_public=1
-	else
-		yunohost app action run $app public_private --args is_public=0
-	fi
-
 	# Set overwrite_settings
 	ynh_app_setting_set --app=$app --key=overwrite_settings --value="$overwrite_settings"
 	# Set overwrite_nginx
diff --git a/scripts/install b/scripts/install
index 67f3925..602a0a4 100644
--- a/scripts/install
+++ b/scripts/install
@@ -121,6 +121,13 @@ ynh_replace_string --match_string="__WORKERS__" --replace_string="$(( $(nproc) *
 # Calculate and store the config file checksum into the app settings
 ynh_store_file_checksum --file="$final_path/lutim.conf"
 
+#=================================================
+# SETUP HOOKS FILE
+#=================================================
+
+ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="../hooks/post_app_addaccess"
+ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="../hooks/post_app_removeaccess"
+
 #=================================================
 # SETUP SYSTEMD
 #=================================================
@@ -192,7 +199,13 @@ yunohost service add $app --log $final_path/log/production.log
 #=================================================
 ynh_script_progression --message="Configuring SSOwat..."
 
-ynh_app_setting_set --app=$app --key=unprotected_uris --value="/"
+ynh_permission_update --permission="main" --add="visitors"
+
+# This is a fake permission without any URL.
+# The purpose of this permission is only to trigger hooks post_app_add/removeaccess when it's modified.
+# We can't use a real permission for now because the actual permision system doesn't support regex.
+ynh_permission_create --permission="upload images" --allowed="visitors"
+
 if [ $is_public -eq 0 ]
 then
 	# If the app is private, viewing images stays publicly accessible.
@@ -203,6 +216,9 @@ then
 	# Modify the domain to be used in a regex
 	domain_regex=$(echo "$domain" | sed 's@-@.@g')
     ynh_app_setting_set --app=$app --key=protected_regex --value="$domain_regex$path_url/stats/?$","$domain_regex$path_url/manifest.webapp/?$","$domain_regex$path_url/?$","$domain_regex$path_url/[d-m]/.*$"
+
+	# If the app is not public, then the "visitors" group doesn't have this permission
+	ynh_permission_update --permission="upload images" --remove="visitors"
 fi
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 54cee0e..425d68e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -55,6 +55,37 @@ elif [ "$is_public" = "No" ]; then
 	is_public=0
 fi
 
+skipped_uris=$(ynh_app_setting_get --app=$app --key=skipped_uris)
+
+# Unused with the permission system
+if [ ! -z "$skipped_uris" ]; then
+	ynh_app_setting_delete --app=$app --key=skipped_uris
+fi
+
+# Create the permission "upload images" only if it doesn't exist.
+if ! ynh_permission_exists --permission="upload images"
+then
+	# This is a fake permission without any URL.
+	# The purpose of this permission is only to trigger hooks post_app_add/removeaccess when it's modified.
+	# We can't use a real permission for now because the actual permision system doesn't support regex.
+	ynh_permission_create --permission="upload images" --allowed="visitors"
+
+	if [ $is_public -eq 0 ]
+	then
+		# If the app is private, viewing images stays publicly accessible.
+		if [ "$path_url" == "/" ]; then
+			# If the path is /, clear it to prevent any error with the regex.
+			path_url=""
+		fi
+		# Modify the domain to be used in a regex
+		domain_regex=$(echo "$domain" | sed 's@-@.@g')
+		ynh_app_setting_set --app=$app --key=protected_regex --value="$domain_regex$path_url/stats/?$","$domain_regex$path_url/manifest.webapp/?$","$domain_regex$path_url/?$","$domain_regex$path_url/[d-m]/.*$"
+
+		# If the app is not public, then the "visitors" group doesn't have this permission
+		ynh_permission_update --permission="upload images" --remove="visitors"
+	fi
+fi
+
 # if final_path isn't set, which can happens with old scripts, set final_path.
 if [ -z "$final_path" ]; then
 	final_path=/var/www/$app
@@ -210,6 +241,13 @@ then
 	fi
 fi
 
+#=================================================
+# SETUP HOOKS FILE
+#=================================================
+
+ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="../hooks/post_app_addaccess"
+ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="../hooks/post_app_removeaccess"
+
 #=================================================
 # SETUP SYSTEMD
 #=================================================
@@ -257,20 +295,6 @@ ynh_script_progression --message="Upgrading logrotate configuration..."
 ynh_use_logrotate --non-append
 chown $app -R /var/log/$app
 
-#=================================================
-# SETUP SSOWAT
-#=================================================
-ynh_script_progression --message="Upgrading SSOwat configuration..."
-
-ynh_app_setting_set --app=$app --key=unprotected_uris --value="/"
-if [ $is_public -eq 0 ]
-then
-	# If the app is private, viewing images stays publicly accessible.
-	# Modify the domain to be used in a regex
-	domain_regex=$(echo "$domain" | sed 's@-@.@g')
-    ynh_app_setting_set --app=$app --key=protected_regex --value="$domain_regex$path_url/stats/?$","$domain_regex$path_url/manifest.webapp/?$","$domain_regex$path_url/?$","$domain_regex$path_url/[d-m]/.*$"
-fi
-
 #=================================================
 # RELOAD NGINX
 #=================================================