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Question About TPM Autodecrypt
(mander.xyz)
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this post was submitted on 27 Oct 2023
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The TPM releases the key to the OS at boot time. Without that, there would be no way for the OS to load (assuming the root FS is encrypted).
The key is bound to PCRs in the TPM, which control under what conditions the key can be released. For example, it can be tied to secure boot, bios settings, etc.