Changing the default CMK
You can change the default key to another key that already exists in the KMS keys dashboard. When you change the default key, all new datasets created in SPICE are encrypted on the new key. The new default key changes how new SPICE datasets are encrypted. However, existing datasets continue to use the previous default key until the dataset is fully refreshed. To encrypt the dataset with a new default key, perform a full refresh on the dataset.
To change the default key to an existing key
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On the QuickSight start page, choose Manage QuickSight, and then choose KMS keys.
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On the KMS keys page, choose MANAGE to open the KMS keys dashboard.
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Navigate to the key that you want to set as your new default. Choose Actions (three dots) on the row of the key that you want to open the key's menu.
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Choose Set as default.
The selected key is now your default key.