The description of how a product protects its assets: trust boundaries, roots of trust, secure boot, key storage, isolation, cryptographic services, update and debug protection, and how each control answers identified threats.
Architecture Work product in the Firmware and software stack lifecycle, the Medical electronics and medical device chips lifecycle, the Industrial and energy electronics lifecycle and the System development lifecycle
It sets the security structure that boot ROM, firmware and hardware must implement, before the parts that cannot change are frozen. Controls added piecemeal leave gaps between components, and the product cannot show regulators or customers how it meets its threat model. Medical and industrial lifecycles use it to show compliance with their sector's security standards.
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