D:"The CySA+ exam outline calls out “trusted firmware updates,” but trusted firmware itself is more commonly described as part of trusted execution environments (TEEs). Trusted firmware is signed by a chip vendor or other trusted party, and then used to access keys to help control access to hardware. TEEs like those used by ARM processors leverage these technologies to protect the hardware by preventing unsigned code from using privileged features."
Agree - Trusted firmware updates are also distributed using secure channels to prevent interception or modification by attackers. Once the update is installed, the firmware attestation process checks to ensure that the updated firmware has been successfully installed and is running correctly.
D is correct. Trusted firmware updates can help, with validation done using methods like checksum validation, cryptographic signing, and similar techniques.
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