Description:
The storage account with the activity log export container is configured to use BYOK (Use Your Own Key).
Rationale:
Configuring the storage account with the activity log export container to use BYOK (Use Your Own Key) provides additional confidentiality controls on log data as a given user must have read permission on the corresponding storage account and must be granted decrypt permission by the CMK.
NOTE: You must have your key vault setup to utilize this.
All Audit Logs will be encrypted with a key you provide. You will need to setup customer managed keys separately, and you will select which key to use via the instructions here. You will be responsible for the lifecycle of the keys, and will need to manually replace them at your own determined intervals to keep the data secure.
From Azure Console
Using Azure Command Line Interface 2.0
az storage account update --name --resource-group --encryption-key-source=Microsoft.Keyvault --encryption-key-vault --encryption-key-name --encryption-key-version
.