> For the complete documentation index, see [llms.txt](https://docs.ngsurvey.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ngsurvey.com/fr/form-management/security/security-items/cas-authentication.md).

# CAS Authentification

## 🔐 Qu'est-ce que l'authentification CAS ?

En utilisant le [central authentication service](https://en.wikipedia.org/wiki/Central_Authentication_Service) (CAS) vous pouvez activer le single-sign-on sur vos formulaires ngSurvey en utilisant un serveur CAS pour authentifier les Répondants.

L'élément de sécurité CAS redirigera automatiquement le Répondant vers le serveur CAS s'il ne trouve aucun ticket. Si un ticket est trouvé mais invalide, il demandera au Répondant de se reconnecter sur le serveur CAS.

## 🔅 Propriétés CAS

* **`URL CAS`**&#x55;RL du serveur hébergeant votre CAS. ex : <https://yourdomain.com/cas> &#x20;
* **`Autoriser les soumissions multiples`** un répondant peut-il participer plusieurs fois au même sondage ?
* **`Message de connexion`** est le message qui sera affiché au Répondant sur la page de connexion qui lui permettra de charger la page de connexion du serveur CAS. Ce message sera affiché si ngSurvey n'arrive pas à authentifier automatiquement l'utilisateur.


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