# Active Directory Security

## 👥 What is Active Directory Security ?

Using the [Active Directory](/installation-setup/installation/active-directory.md) security you can restrict access to your survey to users having a valid Active Directory account. This security item can be setup to either allow single sign on or to let the users login manually using their Active Directory credentials. 

## 🔅 Active Directory security properties

* **`Allow multiple submissions`** respondents can take part multiple time to the same survey.
* **`Single sign on`** user must be already logged in using their Active Directory credentials in their browsers. Not let the respondent enter their credential manually you may leave single sign on off.

{% hint style="warning" %}
Single sign on requires that ngSurvey's Active Directory module is configured for [single sign on support](/installation-setup/installation/active-directory/active-directory-setup.md).
{% endhint %}

{% hint style="success" %}
This security item can be used as a [key provider](/form-management/security/key-provider-concepts.md). 
{% endhint %}


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