this post was submitted on 07 Feb 2024
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Surely some smart key exchange algorithm could be used for that, e.g. the CPU provides a public key to the TPM and the TPM encrypts the symmetric disk key with that public key. Similar to how TLS works.
The private key would have to stored in clear text somewhere. Potentially if you had non volatile space on cpu that to store the private key, that might work. But if you’re going to do that, might as well just use an ftpm.
Just generate one anew. You don't need to use the same one each time
What do you mean by that? Generate a new private/public key pair every time you setup a new TPM? Or when you boot the system or something?
On each connection. Or boot. Whenever you need
Edit: to be clear, this would still be vulnerable to mitm attacks without a user entered password on top but at least you can't just read the secrets from the bus. E2: And having a password wouldn't be fully secure without such a scheme neither