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Remote solution to decrypt disk at boot
(jlai.lu)
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this post was submitted on 07 Dec 2023
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Yes. That is possible. However if the hardware configuration/software configuration changes the TPM should trip and prevent decryption.
The attackers would have to break you ssh/terminal/lock screen/other insecure software. However code injection should be impossible because you used custom secure boot keys and ideally a signed unified kernel image. (Can't even change kernel params without tripping TPM.)
You would not be safe if they did a bus listening attack or if your shell pwd is not safe. If that is your threat vector this may not be a good option for you.