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iTrustee is the Trusted Execution Environment (TEE) for embedded devices implementing GlobalPlatform TEE specifications, and is based on the ARM TrustZone technology. iTrustee is an execution environment isolated from any other execution environment, including the usual Rich Execution Environment (REE), and their applications. iTrustee is embedded in the device and runs alongside a standard OS or Rich Execution Environment, and hosts a set of Trusted Applications (TA) and provides them with a comprehensive set of security services including: integrity of execution, secure communication with the Client Applications (CA) running in the REE, trusted storage, key management and cryptographic algorithms, time management and arithmetical API.