TEE (Trusted Execution Environment) is a general security technology used across different architectures and platforms. In this article, however, we will focus specifically on TEE solutions in Android devices.
On Android devices, TEE is a hardware-backed isolated execution environment provided by the processor. The operating system and applications we use in daily life run in the “Normal World,” also known as the REE (Rich Execution Environment). The REE includes the Android kernel, services, and user applications. However, it is a complex environment exposed to potential attacks, and on its own, it is not sufficient for handling critical security functions.
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