OP-TEE is a secure Operating System (OS) that provides a Trusted Execution Environment (TEE) for REE (Android/Linux). The OP-TEE OS runs on the same processor as the Android OS/Linux OS, but OP-TEE is isolated from the rest of the system by both hardware and software. OP-TEE OS’s isolation protects it from malicious apps and potential vulnerabilities that may be discovered in Android/Linux.
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