My understanding is that with FileVault enabled one can restart a Mac into its Recovery System and erase the hard drive/SSD using Disk Utility. This procedure supposedly deletes the FileVault key, which means any data on the drive is useless as it can no longer be decrypted.
If a system is in the state described above but previously had a institutional (or personal) recovery key enabled does it mean that key could still be used to recover the data?
My intention is to be able to securely dispose of the FileVault key as well as other recovery keys that might have been set but I was not able to find official documentation from Apple confirming a secure procedure.