> 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/form-management/security/security-items/azure-active-directory-security.md).

# Azure Active Directory Security

## 👥 What is Azure Active Directory Security ?

Using the Azure  security you can restrict access to your survey to users having a valid Azure Active Directory account. This security item can be setup to either allow single sign on to automatically sign in the respondents if they have already logged into Azure Active Directory or to let the users login manually using their Azure Active Directory credentials. 

## 🔅 Active Directory security properties

* **`Application (client) ID`** ID of the application that you have [setup](/installation-setup/installation/azure-active-directory/azure-active-directory-setup.md) and registered in your Azure Active Directory portal. If you leave it blank it ngSurvey will use the Application ID set globally in your [system settings](/installation-setup/system-settings/azure-active-directory-settings.md). 
* **`Authority`** Azure Active Directory Authority, if you don't have a custom Authority you may leave this value blank.

  **`Allow multiple submissions`** allows a respondent to take part multiple time to the same survey.
* **`Single sign on`** if respondents are already authenticated in Azure Active directory ngSurvey will automatically sign them into the survey.
* **`Authorization token lifetime`**defines in minutes how long ngSurvey will trust the authentication token generated by the user from Azure. Once expired the user will be required to log back in to submit the survey.

{% 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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