Abstract
AbstractA trusted execution environment (TEE) is a secure, integrity-protected processing environment, consisting of processing, memory and storage capabilities. It is isolated from the “normal” processing environment, sometimes called the rich execution environment (REE), where the device operating system and applications run. TEEs can make it possible to build REE applications and services with better security and usability by partitioning them so that sensitive operations are restricted to the TEE and sensitive data, like cryptographic keys, never leave the TEE. In our daily lives, we encounter more and more services that use dedicated hardware tokens to improve their security: one-time code tokens for two-factor authentication, wireless tokens for opening doors in buildings or cars, tickets for public transport, and so on. Mobile devices equipped with TEEs have the potential for replacing these many tokens thereby improving the usability for users while also reducing the cost for the service providers without hampering security.
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