Oct 23, 2018 · With Apple’s Secure Enclave and ARM’s TrustZone, the Secure Enclave or TrustZone is not technically a different “chip.” Instead, it’s a separate, isolated processor built into the device’s main system-on-a-chip. While it’s built-in, it still has a separate processor and area of memory. Think of it as a chip inside the main chip.
The difference between the IOMMU and TrustZone is the position of the protection. The wikipedia drawing does not show the bus controller. With IOMMU, the protection lays in the DMA device. With TrustZone, each DMA master and slave has access rights (like an MMU in a hypervisor). TrustZone is limited to either secure or normal. ARM Cortex-M TrustZone. Secure/Non Secure Trusted/Non-Trusted Why do you need TrustZone? What is the need for TrustZone? Some Background and Motivation The Classification of Privileged/Non-Privileged 'Access Level' provides some basic form of security mechanism, which the users may use to implement access rights of software running on the processor on system's memory space. What’s new with the Memory Protection Unit (MPU) in Cortex Nov 19, 2016
Why do you need TrustZone? What is the need for TrustZone? Some Background and Motivation The Classification of Privileged/Non-Privileged 'Access Level' provides some basic form of security mechanism, which the users may use to implement access rights of software running on the processor on system's memory space.
TrustZone for Cortex-A. TrustZone is used on billions of application processors to protect high-value code and data for diverse use cases including authentication, payment, content protection and enterprise. On application processors, TrustZone is frequently used to provide a security boundary for a GlobalPlatform Trusted Execution Environment. TrustZone works by introducing a new “secure” mode in which the CPU can operate. When operating in this new mode the CPU can access all of the device’s hardware and memory. When operating in the non-TrustZone (“normal”) mode, only a subset of peripherals and specific ranges of physical memory can be accessed. A TEE can make use of
TrustZone for Cortex-A – Arm
The difference between the IOMMU and TrustZone is the position of the protection. The wikipedia drawing does not show the bus controller. With IOMMU, the protection lays in the DMA device. With TrustZone, each DMA master and slave has access rights (like an MMU in a hypervisor). TrustZone is limited to either secure or normal. ARM Cortex-M TrustZone. Secure/Non Secure Trusted/Non-Trusted Why do you need TrustZone? What is the need for TrustZone? Some Background and Motivation The Classification of Privileged/Non-Privileged 'Access Level' provides some basic form of security mechanism, which the users may use to implement access rights of software running on the processor on system's memory space. What’s new with the Memory Protection Unit (MPU) in Cortex Nov 19, 2016