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The Platform Security Architecture (PSA) is a holistic set of threat models, security analyses, hardware and firmware architecture specifications, and an open source firmware reference implementation. PSA provides a recipe, based on industry best practice, that allows security to be consistently designed in, at both a hardware and firmware level. PSA is a contribution from Arm to the entire IoT ecosystem, from chip designers and device developers to cloud and network infrastructure providers and software vendors. PSA is scalable for all connected devices, offering common ground rules and a more economical approach to building more secure devices.


Security is top of the agenda for anyone involved in the IoT industry. However, it is a difficult and potentially costly area to get right. With billions of connected devices and ever-greater complexity comes an increased threat of attack and the need to secure the data and infrastructure of the things at multiple levels. Arm provides an array of hardware IP and firmware to create more secure devices. Arm aims, with these enabling technologies, to make security quicker, easier and more affordable to design in, providing scalable security at the very heart of the device. In addition we will provide a reference open source firmware implementation (similar to Arm's existing Trusted Firmware project) to further minimize cost.

Block Diagram


  • Designed to secure low cost IoT devices, where a full Trusted Execution Environment (TEE) would not be appropriate.
  • PSA protects sensitive assets (keys, credentials and firmware) by separating these from the application firmware and hardware.
  • PSA defines a Secure Processing Environment (SPE) for this data, the code that manages it and its trusted hardware resources.
  • PSA is architecture agnostic and can be implemented on Cortex-M, Cortex-R and Cortex-A-based devices.
  • The initial focus is Cortex-M-based devices.

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