Home > Resources > docs > ARM-TrustZone

Arm TrustZone for Cortex-A

Last modified: 2026-10-23

URL: https://www.arm.com/technologies/trustzone-for-cortex-a

Summary

Arm's overview of TrustZone, the hardware security extension that partitions a Cortex-A system into a Normal World and a Secure World, providing the isolation on which mobile TEEs (Trusty, QSEE, Kinibi) are built. Arm's developer documentation (Learn the architecture: TrustZone for AArch64) gives the technical details.