TrustZone is different from that of a separate physical security co-processor (like a TPM or a secure element) with a pre-defined set of features. You can think of it as a virtualization technology for ARM CPUs i.e. it virtualizes a physical ARM CPU core — a TrustZone enabled ARMv8 core can exist in one of 2 states **Secure OR Non-Secure. **This, in turn, allows us to partition all system HW and SW resources so that they exist in 1 of the 2 worlds.

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