diff --git a/annuaire/settings.py b/annuaire/settings.py
index 657cae3..0501811 100644
--- a/annuaire/settings.py
+++ b/annuaire/settings.py
@@ -36,6 +36,7 @@ INSTALLED_APPS = [
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
+    'django_cas_ng',
     'fiches'
 ]
 
@@ -67,6 +68,11 @@ TEMPLATES = [
     },
 ]
 
+AUTHENTICATION_BACKENDS = (
+    'django.contrib.auth.backends.ModelBackend',
+    'django_cas_ng.backends.CASBackend',
+)
+
 WSGI_APPLICATION = 'annuaire.wsgi.application'
 
 
@@ -123,3 +129,8 @@ STATIC_URL = '/static/'
 MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
 
 MEDIA_URL = '/media/'
+
+CAS_SERVER_URL = 'https://cas.eleves.ens.fr/'
+
+CAS_VERSION = "2"
+
diff --git a/annuaire/urls.py b/annuaire/urls.py
index b8febf5..85e272c 100644
--- a/annuaire/urls.py
+++ b/annuaire/urls.py
@@ -18,12 +18,15 @@ from django.contrib import admin
 from django.urls import path, include
 from django.conf.urls.static import static
 from fiches.views import home, birthday
+import django_cas_ng.views as cas_views
 
 urlpatterns = [
     path('admin/', admin.site.urls),
     path('fiche/', include('fiches.urls')),
     path('', home, name='home'),
-    path('birthday', birthday, name='birthday')
+    path('birthday', birthday, name='birthday'),
+    path('login', cas_views.LoginView.as_view(), name='cas_ng_login'),
+    path('logout', cas_views.LogoutView.as_view(), name='cas_ng_logout'),
 ]
 
 if settings.DEBUG:
diff --git a/fiches/forms.py b/fiches/forms.py
index 83c20c0..28a72ea 100644
--- a/fiches/forms.py
+++ b/fiches/forms.py
@@ -22,7 +22,9 @@ class ProfileForm(forms.ModelForm):
 class SearchForm(forms.Form):
     name = forms.CharField(label='Nom/Surnom', max_length=1023, required=False)
     year = forms.IntegerField(label='Promotion', required=False)
-    department = forms.ModelMultipleChoiceField(queryset=Department.objects.all(), required=False)
+    department = forms.ModelMultipleChoiceField(
+        queryset=Department.objects.all(), required=False
+    )
 
     def clean(self):
         cleaned_data = super().clean()
diff --git a/fiches/migrations/0004_auto_20200212_2130.py b/fiches/migrations/0004_auto_20200212_2130.py
new file mode 100644
index 0000000..672d23f
--- /dev/null
+++ b/fiches/migrations/0004_auto_20200212_2130.py
@@ -0,0 +1,20 @@
+# Generated by Django 2.2.9 on 2020-02-12 21:30
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('fiches', '0003_auto_20200108_2306'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='profile',
+            name='user',
+            field=models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='profile', to=settings.AUTH_USER_MODEL, verbose_name='utilisateur'),
+        ),
+    ]
diff --git a/fiches/templates/fiches/base.html b/fiches/templates/fiches/base.html
index 0e4fa7b..dd66119 100644
--- a/fiches/templates/fiches/base.html
+++ b/fiches/templates/fiches/base.html
@@ -29,6 +29,11 @@
                 <a href='{% url "fiche_modif" %}'> Modifier sa fiche d'annuaire </a>
                 <a href='{% url "fiche" request.user.profile.id %}'> Consulter sa fiche d'annuaire </a>
                 <a href='{% url "birthday" %}'> Anniversaires à venir </a>
+                {% if user.is_authenticated %}
+                <a href='{% url "cas_ng_logout" %}'> Se déconnecter</a>
+                {% else %}
+                <a href='{% url "cas_ng_login" %}'> Se connecter</a>
+                {% endif %}
 
             </nav>
         </div>
diff --git a/requirements.txt b/requirements.txt
index 1b3a0c4..4e4fcaf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 django==2.2.*
-Pillow
\ No newline at end of file
+Pillow
+django_cas_ng