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Introducing Arm TrustZone

Arm TrustZone technology provides system-wide hardware isolation for trusted software. The family of TrustZone technologies can be integrated into any Arm Cortex-A core, supporting high-performance applications processors, with TrustZone technology for Cortex-A processors.

It also supports the latest Cortex-M23 and Cortex-M33 based systems, thanks to the release of the Armv8-M architecture, filling the market need for efficient secure embedded solutions.

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The basics of Arm TrustZone

Arm TrustZone creates an isolated secure world which can be used to provide confidentiality and integrity to the system. It is used on billions of applications' processors to protect high-value code and data for diverse use cases including authentication, payment, content protection and enterprise. On application processors it is frequently used to provide a security boundary for a GlobalPlatform Trusted Execution Environment.

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TrustZone for Armv8-A vs. TrustZone for Armv8-M

Feature/Architecture TrustZone for Armv8-A TrustZone for Armv8-M 
Additional security states SEL0 - Trusted Apps SEL1 - Trusted OS EL3 - Trusted Boot and Firmware (Armv8-A) Secure thread - Trusted code/data Secure handler - Trusted device drivers, RTOS, Library managers...
Secure interrupts Yes Yes (Fast) 
State transition (Boundary crossing) Software transition Hardware transition (Fast) 
Memory management Virtual memory MMU with secure attributes Secure Attribution Unit (SAU) and MPU memory partitions
System interconnect security Yes Yes
Secure code, data and memory Yes Yes
Trusted boot  Yes Yes
Software Arm trusted firmware (and third-party TEEs)  Keil CMSIS, Arm mbed OS, mbed uVisor and third-party software 

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Community Blogs

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Silicon Labs’ multiprotocol Series 2 wireless platform adds cutting-edge se

Read more about Silicon Labs Arm Cortex-M33 based low-power wireless family with support for Bluetooth 5.1, Zigbee 3.0 and Thread.

1 months ago by Kobus Marneweck
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Anchoring TrustZone with SRAM PUF

Let's take a look at how SRAM PUF, enabled through software, is a powerful addition to the security features offered by Arm TrustZone.

1 months ago by Marten van Hulst
1
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STMicroelectronics enhances STM32 portfolio security with new Arm…

The first ST product family to incorporate TrustZone technology for Arm Cortex-M processors, making possible system-wide software security and a new level of trust for embedded devices.

8 months ago by Kobus Marneweck
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NXP enhances embedded security and signal processing with new Arm…

NXP announces two new chip families based on the Arm Cortex-M33 processor, one of the first Cortex-M processors with TrustZone security technology, bringing a new level of trust to embedded systems.

8 months ago by Kobus Marneweck
1
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Enhancing embedded device security with new TrustZone-enabled microcontroll

The introduction of Nuvoton’s M2351 microcontroller, including the Arm Cortex-M23 processor brings a new level of trust and security to embedded systems.

9 months ago by Kobus Marneweck
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Microchip release first Arm Cortex-M23 based chip bringing new levels of…

Microchip unveiled two MCU families, the SAM L11 with TrustZone for Armv8-M, for applications requiring embedded security, and SAM L10 for low-power and touch capabilities.

11 months ago by Kobus Marneweck

Community Forums

Suggested answer Context protection when calling a secure function(NSC) in a non-secure interrupt function 0 votes 479 views 10 replies Latest 5 days ago by Yang Zhang Answer this
Suggested answer How to place FreeRTOS in secure memory and the user tasks in non-secure memory?
  • TrustZone
  • Armv8-M
 0 votes 6190 views 21 replies Latest 17 days ago by Joseph Yiu Answer this
Answered Boot sequence and secure boot
  • Cortex-M23
  • Cortex-M
  • Armv8-M
 0 votes 1524 views 2 replies Latest 1 months ago by LukaP Answer this
Suggested answer Non-secure code calling secure code - Boot Loaders 0 votes 722 views 2 replies Latest 1 months ago by vinkot Answer this
Not answered MPU and TrustZone 0 votes 579 views 0 replies Started 2 months ago by Talk2Joseph Answer this
Answered Non-secure EXC_RETURN value to Secure HardFault Handler 0 votes 1373 views 2 replies Latest 4 months ago by Rajiv Answer this
Suggested answer Context protection when calling a secure function(NSC) in a non-secure interrupt function Latest 5 days ago by Yang Zhang 10 replies 479 views
Suggested answer How to place FreeRTOS in secure memory and the user tasks in non-secure memory? Latest 17 days ago by Joseph Yiu 21 replies 6190 views
Answered Boot sequence and secure boot Latest 1 months ago by LukaP 2 replies 1524 views
Suggested answer Non-secure code calling secure code - Boot Loaders Latest 1 months ago by vinkot 2 replies 722 views
Not answered MPU and TrustZone Started 2 months ago by Talk2Joseph 0 replies 579 views
Answered Non-secure EXC_RETURN value to Secure HardFault Handler Latest 4 months ago by Rajiv 2 replies 1373 views