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How secure is it to seal only to PCRs 0 and PCRs 2-7 with fTPM 2.0? My device does not support Intel TXT, so I am unable to extend the chain of trust to implement DRTM, and thus cannot use PCRs 17-22.

Are the 7 PCRs that I'm sealing data to enough to perform secure platform attestation, and if not, is there any way that I can increase the level of security given my current position?

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