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Do you use TPM ?
(lemmy.ml)
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Together with secure boot and your own signing keys, it could be a good way to en/decrypt the a dm-verity secured read-only rootfs. But for the home partition I would probably still want to enter my own decryption key, maybe via systemd-homed. From there you can update the kernel/initramfs and read-only rootfs image and sign them for the next boot.
This is complicated to set up. Otherwise maybe use TPM as a 2FA, so you still have to enter a pin?