• 9tr6gyp3@lemmy.world
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    4 months ago

    If the hardware signatures don’t match, it wont boot without giving a warning. If the TPM/Secure Enclave is replaced/removed/modified, it will not boot without giving a warning.

    • uis@lemm.ee
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      4 months ago

      If the hardware signatures don’t match

      Compromised hardware will say it is same hardware

      If the TPM/Secure Enclave is replaced/removed/modified, it will not boot without giving a warning.

      Compromised hardware controls execution of software. Warning is done in software. Conpromised hardware won’t let it happen.

        • uis@lemm.ee
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          4 months ago

          Compromised hardware can’t create new signatures, but it doesn’t matter because it controls execution of software and can skip any checks.

          • 9tr6gyp3@lemmy.world
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            4 months ago

            If the hardware is tampered, it will not pass the attestation test, which is an online component. It will fail immediately and you will be alerted. Thats the part of verified boot that makes this so much harder for adversaries. They would have to compromise both systems. The attestation system is going to be heavily guarded.

            • uis@lemm.ee
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              4 months ago

              which is an online component.

              So, storing on Signal’s server key to decrypt keys. Welcome back to apple-isms and online-only.

              It will fail immediately and you will be alerted.

              Provided you have some other non-compromised way of communications.

              • 9tr6gyp3@lemmy.world
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                4 months ago

                Yes, verified boot will have out-of-bands alerts for you by design. Without the online component, you will risk not being able to detect tampering.