# Configuring encryption on archives
<a name="encryption-archive-configure"></a>

You can specify the KMS key for EventBridge to use when you create or update an archive.

## Specifying encryption when creating an archive
<a name="encryption-archive-create"></a>

Choosing the Amazon KMS key used for encryption is an option creating an archive. The default is to use the Amazon owned key provided by EventBridge. 

**To specify a customer managed key for encryption when creating an archive (console)**
+ Follow these instructions:

  [Creating archives](eb-archive-event.md).

**To specify a customer managed key for encryption when creating an archive (CLI)**
+ When calling `[create-archive](https://docs.amazonaws.cn/cli/latest/reference/events/create-archive.html)`, use the `kms-key-identifier` option to specify the customer managed key for EventBridge to use for encrypting events stored in the archive.

## Updating encryption on archives
<a name="encryption-archive-update"></a>

You can update the Amazon KMS key being used for encryption at rest on an existing archive. This includes:
+ Changing from the default Amazon owned key to a customer managed key.
+ Changing from a customer managed key to the default Amazon owned key.
+ Changing from one customer managed key to another.

**To update the KMS key used for encrypting events in an archive (console)**

1. Open the Amazon EventBridge console at [https://console.amazonaws.cn/events/](https://console.amazonaws.cn/events/).

1. Navigate to the archive directly, or from the source event bus:
   + In the navigation pane, choose **Event buses**.

     On the events bus details page, choose the **Archives** tab.
   + In the navigation pane, choose **Archives**.

1. Choose the archive you want to update.

1. On the archive details page, choose the **Encryption** tab.

1. Choose the KMS key for EventBridge to use when encrypting the events stored in the archive.
**Important**  
If you have specify that EventBridge use a customer managed key for encrypting the source event bus, we strongly recommend you also specify a customer managed key for any archives for the event bus as well.
   + Choose **Use Amazon owned key** for EventBridge to encrypt the data using an Amazon owned key.

     This Amazon owned key is a KMS key that EventBridge owns and manages for use in multiple Amazon accounts. In general, unless you are required to audit or control the encryption key that protects your resources, an Amazon owned key is a good choice. 

     This is the default.
   + Choose **Use customer managed key** for EventBridge to encrypt the data using the customer managed key that you specify or create.

     Customer managed keys are KMS keys in your Amazon account that you create, own, and manage. You have full control over these KMS keys.

     1. Specify an existing customer managed key, or choose **Create a new KMS key**.

       EventBridge displays the key status and any key aliases that have been associated with the specified customer managed key.

**To update the KMS key used for encrypting events stored in an archive (CLI)**
+ When calling `[update-archive](https://docs.amazonaws.cn/cli/latest/reference/events/update-archive.html)`, use the `kms-key-identifier` option to specify the customer managed key for EventBridge to use for encrypting events stored in the archive.