Using TrustZone prevents software vulnerabilities in one execution environment being exploited to gain access into another. This reduces heat output by reducing the frequency of the core clocks, allowing passive cooling - even without heatsink - but also negatively impacts performance. 09/03/2020 ∙ by Zahra Tarkhani, et al. pp 133-151 | Due to emulation costs, the Qemu results are the worst ones. World. The TrustZone technology, available in the vast majority of recent Arm processors, allows the execution of code inside a so-called secure world. Next, this context is passed to TEEC_OpenSession which returns a session. Similar to how TPM chips were meant to magically make PCs "trustworthy", TrustZone aimed at establishing trust in ARM-based platforms. a discrepancy between the thermals API and the LM35 of over 15°C at times. World Switching. However, since kernel threads executing the TAs have a higher priority, the userland threads were starved and thus did not produce enough data points. © 2020 Springer Nature Switzerland AG. It SANCTUARY: ARMing TrustZone with User-space Enclaves. Energy results are always presented by systematically excluding idle energy consumption, e.g., we only show the energy cost of the given operation. Data is passed back and forth between worlds by memory pointers or direct copies. 04/25/2019 ∙ by Christian Göttel, et al. Op-Tee is flexible and can be deployed to platforms for which there exists a manifest, that lists the dependencies required to build for the platform it describes, as well as its hardware characteristics. §2 describes the TrustZone architecture and key concepts of world isolation. As such, assets need to be protected from attackers, in particular those easily subject to physical tampering. Arm® TrustZone® technology provides a cost-effective methodology to isolate security critical components in a system while not complicating life for the developers of all those other components that make the modern system on a chip (SoC) such a capable component. This greatly facilitates development of secure application by reducing setup and development efforts. In TrustZone, there are two worlds, the Normal World, and the Secure World. Once the maximal temperature is reached, recovery time is around 8 minutes when passively cooled and less than a minute with active cooling. The research leading to these results has received funding from the European Union’s Horizon 2020 research and innovation programme under the LEGaTO Project (http://legato-project.eu), grant agreement No 780681. TrustZone is a hardware secu-rity extension of the ARM processor architecture, which includes bus fabric and system peripherals. Trusted applications provide services to either standard userland programs or other TAs. 946–950. : SAFETHINGS: data security by design in the IoT. Interestingly, using memory from within the TEE is also less energy eager (Figure 10), also verified by the cost of the single operations in the various configurations. As a consequence measures which should be taken to reduce the temperature, such as software thermal throttling, are not undertaken. This is realized by using an additional addressing line, the NS (Non Secure) bit. ∙ ∙ ∙ The integrated Ethernet MAC with individual DMA ensures high data throughput. (1) the lack of several basic features inside the REE kernel for security reasons, which materialize in the lack of basic syscalls (e.g. Being a feature often used by nomad devices with low energy autonomy, we deeply investigate its energy impacts. OP-TEE Raspberry 3B platform specific documentation. The implementation, deployment and testing of secure services for Intern... Op-Tee is a security framework that includes several components: a minimal secure-world operating system (the Op-Tee Os [26]); the tee-supplicant [30], offering normal world services to the secure world; a complete build toolchain [24], the testing tool [28] (OPTEE sanity testsuite), a secure privileged layer enabling world switching, a basic REE image, and several utility functions for developers to implement TAs. Trusted Application. SAFETHINGS: Data Security by Design in the IoT. – artless noise Oct 14 '14 at 16:34 An actively cooled system on the other hand can operate in any mode and stay well within acceptable conditions, even without additional heat sink. Originally, we planned on using a script to record the temperature at fixed intervals during the CPU stress tests executed by userland threads. Min/max values are also included. Additionally, the Qemu open source emulator [33] allows to deploy and evaluate Op-Tee in emulated mode on ubiquitous machines. For some of our measurements, we compared the hardware experiments against a modified version of the Qemu emulator provided by Op-Tee with support for TrustZone [34]. As such, a secure application can easily be ported to another platform, due to the standardized nature of available services. January 2019; DOI: 10.14722/ndss.2019.23448. These files have a unique numeric name based on a counter. ARM TrustZone technology has been around for almost a decade. These include interactions with persistent (secure) storage [57, Chapter 5], memory  [57, Chapter 4.11], and cryptographic operations [57, Chapter 6]. The core frequency is increased during the execution of stressful workloads and reduced right after, for instance when the maximum temperature is reached in order to prevent overheating. The TA Storage Key (TSK) is a per-TA key, derived from the SSK and the TA’s UUID identifier. ∙ TrustZone and Processor States. Entry to a different world (from secure to unsecure and vice versa) is done on a core-basis, thus limiting the parallel execution of TAs to the number of available cores. GlobalPlatform TEE Client API Specification v1.0. The Op-Tee project includes a few TA examples and host applications, which are a good foundation to introduce the TEE paradigm.
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