The existing key can be deleted. If a key is deleted, you'll lose access to the data on the disks encrypted with this key.
If you want to delete a certain key choose it in the list of keystores and keys on the page "Keys" and press the "Delete" button on the right.
To delete a key, you must confirm the deletion and only after that the key will be deleted.
After deletion, you won't be able to restore the key or recreate it, so be very careful. If the key used for the disk encryption is deleted, all the data on the disk will be irretrievably lost.
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