this post was submitted on 12 Jan 2025
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One place it would be useful is if you are worried about somebody breaking into your home and stealing your computer. Don't store the key on the home computer, instead store it on a cloud server. The home computer connects to the cloud server, authenticates itself with some secret, then if the cloud server authorizes, it can return the decryption key.
Then if your computer gets stolen or seized, it'll connect via a different IP and the cloud server can deny access or even wipe the encryption key.
this doesn't protect against all risks, but it has its uses.
Example: https://www.ogselfhosting.com/index.php/2023/12/25/tang-clevis-for-a-luks-encrypted-debian-server
Thanks, I was thinking about it as if the key was stored on the same drive. Like OP is trying to do. Which I don't think would help in the case of it being stolen. Or any case I can think of. But I see how A cloud key would make a lot of sense. And would be a good compromise on security vs convenience.