Trusted Execution Environments

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Trusted execution environments (TEEs) protect sensitive code and data on computing platforms, even when the primary operating system is compromised. Once a technical curiosity, TEEs have rapidly become a key component in securing numerous systems from cloud servers to constrained devices. Today, TEEs have been deployed on billions of devices for protecting financial payments, personal files, copyrighted media content, and many others. Despite this, TEEs remain poorly understood due to their complexity and diversity. This book addresses this gap, providing a comprehensive treatment of different TEE technologies, their features, benefits, and shortcomings. A holistic view of secure and trusted execution is taken, examining smart cards and CPU protection rings before discussing modern TEEs, such as Intel SGX and ARM TrustZone. A wide range of paradigms for building secure and trusted execution environments are explored, from dedicated security chips to system-on-chip extensions and