diff --git a/app/forms/main/config_cas.py b/app/forms/main/config_cas.py
index 7d7f4f7e..217b274f 100644
--- a/app/forms/main/config_cas.py
+++ b/app/forms/main/config_cas.py
@@ -31,7 +31,7 @@ Formulaires configuration Exports Apogée (codes)
 
 from flask_wtf import FlaskForm
 from wtforms import BooleanField, SubmitField
-from wtforms.fields.simple import StringField, TextAreaField
+from wtforms.fields.simple import FileField, StringField, TextAreaField
 
 
 class ConfigCASForm(FlaskForm):
@@ -50,11 +50,10 @@ class ConfigCASForm(FlaskForm):
     )
 
     cas_ssl_verify = BooleanField("Vérification du certificat SSL")
-    cas_ssl_certificate = TextAreaField(
+    cas_ssl_certificate_file = FileField(
         label="Certificat (PEM)",
         description="""Le contenu du certificat PEM
         (commence typiquement par <tt>-----BEGIN CERTIFICATE-----</tt>)""",
-        render_kw={"class": "form-control", "rows": 8},
     )
 
     submit = SubmitField("Valider")
diff --git a/app/static/css/scodoc.css b/app/static/css/scodoc.css
index e32ff65b..5db529ce 100644
--- a/app/static/css/scodoc.css
+++ b/app/static/css/scodoc.css
@@ -4539,4 +4539,10 @@ table.formation_table_recap td.heures_cours,
 table.formation_table_recap td.heures_td,
 table.formation_table_recap td.heures_tp {
   text-align: right;
+}
+
+div.cas_etat_certif_ssl {
+  margin-top: 12px;
+  font-style: italic;
+  border: 1px dashed black;
 }
\ No newline at end of file
diff --git a/app/templates/config_cas.j2 b/app/templates/config_cas.j2
index 2cccd0de..430f1ffe 100644
--- a/app/templates/config_cas.j2
+++ b/app/templates/config_cas.j2
@@ -6,11 +6,18 @@
 
 
 <div class="help">
-    <p>Le CAS...</p>
+    <p>Le CAS permet d'utiliser un service SSO pour connecter les utilisateurs.</p>
 </div>
 <div class="row">
-    <div class="col-md-4">
+    <div class="col-md-8">
         {{ wtf.quick_form(form) }}
+        <div class="cas_etat_certif_ssl">Certificat SSL
+        {% if cas_ssl_certificate_loaded %}
+            chargé.
+        {% else %}
+            non chargé.
+        {% endif %}
+        </div>
     </div>
 </div>
 
diff --git a/app/views/scodoc.py b/app/views/scodoc.py
index 3c3e5aba..2aa27968 100644
--- a/app/views/scodoc.py
+++ b/app/views/scodoc.py
@@ -75,7 +75,7 @@ from app.scodoc import sco_find_etud
 from app.scodoc import sco_logos
 from app.scodoc import sco_utils as scu
 
-from app.scodoc.sco_exceptions import AccessDenied
+from app.scodoc.sco_exceptions import AccessDenied, ScoValueError
 from app.scodoc.sco_permissions import Permission
 from app.views import scodoc_bp as bp
 import sco_version
@@ -152,10 +152,14 @@ def config_cas():
             flash("Serveur CAS enregistré")
         if ScoDocSiteConfig.set("cas_ssl_verify", form.data["cas_ssl_verify"]):
             flash("Vérification SSL modifiée")
-        if ScoDocSiteConfig.set(
-            "cas_ssl_certificate", form.data["cas_ssl_certificate"]
-        ):
-            flash("Certificat SSL enregistré")
+        if form.cas_ssl_certificate_file.data:
+            data = request.files[form.cas_ssl_certificate_file.name].read()
+            try:
+                data_str = data.decode("ascii")
+            except UnicodeDecodeError as exc:
+                raise ScoValueError("Fichier certificat invalide (non ASCII)") from exc
+            if ScoDocSiteConfig.set("cas_ssl_certificate", data_str):
+                flash("Certificat SSL enregistré")
         set_cas_configuration()
         return redirect(url_for("scodoc.configuration"))
 
@@ -164,11 +168,11 @@ def config_cas():
         form.cas_server.data = ScoDocSiteConfig.get("cas_server")
         form.cas_attribute_id.data = ScoDocSiteConfig.get("cas_attribute_id")
         form.cas_ssl_verify.data = ScoDocSiteConfig.get("cas_ssl_verify")
-        form.cas_ssl_certificate.data = ScoDocSiteConfig.get("cas_ssl_certificate")
         return render_template(
             "config_cas.j2",
             form=form,
             title="Configuration du Service d'Authentification Central (CAS)",
+            cas_ssl_certificate_loaded=ScoDocSiteConfig.get("cas_ssl_certificate"),
         )