> 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/data-encryption/encryption-setup/transparent-encryption/iis-encryption-setup.md).

# IIS Encryption Setup

If you're using IIS to host your on-premise version you may setup the variable in the IIS configuration editor as shown below or as a more secure alternative you may also use an [Azure key vault](https://azure.microsoft.com/en-us/services/key-vault/) to store your key. 

{% hint style="info" %}
While you could also store the key in directly the web.config file we would recommend not using that approach and set the environment variables either at your host level or using the IIS configuration editor as shown below.  
{% endhint %}

\
Open IIS administration interface and go to your site settings page. 

![](https://1025048312-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8fLhS0bmfBRyq0HdUm%2F-MI2L3vOQym3T_0iJyoW%2F-MI2MsV49K6Ywqx3Zds5%2Fimage.png?alt=media\&token=4bc011bc-8ff4-403a-93a0-2f4b65693a48)

From within the configuration editor select the environmentVariables option

![](https://1025048312-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8fLhS0bmfBRyq0HdUm%2F-MI2L3vOQym3T_0iJyoW%2F-MI2ODkfXyjPLj76fAiD%2Fimage.png?alt=media\&token=28f0d517-0f72-459e-b04d-3bc308ab169c)

From there you can enter the key that will be used for encryption / decryption.

![](https://1025048312-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8fLhS0bmfBRyq0HdUm%2F-MI2L3vOQym3T_0iJyoW%2F-MI2LoUJpJ8k3uUaNFok%2Fimage.png?alt=media\&token=c18c57ea-7676-4e6a-b6ed-d7d7c2e98578)

## 🔐 IIS / Azure key vault

To use an Azure key vault to host and store your ngSurvey settings and keys you may set following environment variables on your server.

* **KeyVault:Name** is the name of your Key vault
* **AzureAd:ClientId** is the client id to access your Key vault
* **AzureAd:ClientSecret** is the client secret to access your key vault


---

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