diff --git a/app/controllers/administrateurs/activate_controller.rb b/app/controllers/administrateurs/activate_controller.rb
index d5d902444..60b329851 100644
--- a/app/controllers/administrateurs/activate_controller.rb
+++ b/app/controllers/administrateurs/activate_controller.rb
@@ -1,3 +1,5 @@
+require 'zxcvbn'
+
 class Administrateurs::ActivateController < ApplicationController
   layout "new_application"
 
@@ -29,6 +31,11 @@ class Administrateurs::ActivateController < ApplicationController
     end
   end
 
+  def test_password_strength
+    score = Zxcvbn.test(params[:password], [], ZXCVBN_DICTIONNARIES).score
+    render json: { score: score }
+  end
+
   private
 
   def update_administrateur_params
diff --git a/config/routes.rb b/config/routes.rb
index 1a5f2423e..61c268e7f 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -175,6 +175,7 @@ Rails.application.routes.draw do
   namespace :admin do
     get 'activate' => '/administrateurs/activate#new'
     patch 'activate' => '/administrateurs/activate#create'
+    post 'activate/test_password_strength' => '/administrateurs/activate#test_password_strength'
     get 'sign_in' => '/administrateurs/sessions#new'
     get 'procedures/archived' => 'procedures#archived'
     get 'procedures/draft' => 'procedures#draft'