Root-of-trust - What it is and why you need one in IoT
summary
Defines a root-of-trust as a hardware foundation holding a root key and a signature verification primitive that anchors secure boot and identity, not just encryption storage; cites TPMs and vendor-specific RoTs as real examples, warns that pure software RoTs are fragile and “deteriorate” over time, shows downloadable SIMs as a common virtual RoT, notes ARM TrustZone only supplies building blocks, and recommends reusing a vetted RoT rather than building one.
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