this post was submitted on 07 Feb 2024
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Why not store it directly in the TPM, if that's the device that will do that initial decryption?
You can't do that since vulnerability is the connection between the TPM and the CPU, you need to encrypt that path.
The TPM comes out from the factory with a private key stored in it. The CPU has the public key.
You turn on the laptop for the first time, and the communication between the CPU and the TPM is encrypted from the start.
That's what I'm referring to. Can't this be done? I'm guessing it's not that easy because I'm sure computer designers have already considered this idea.
Pretty sure they meant if you need to keep a persistent public/private pair you can keep them in the tpm and initiate the exchange from there
That's correct. I'm guessing if it hasn't been implemented yet, then there is some technical roadblock I'm currently missing.