Trusted Execution Environment is a method like Homomorphic Encryption, to perform operations on data in a form of encrypted state, this form is quite different though. TEE’s work by taking in encrypted data and decrypting it into an encrypted trusted area (called an enclave with Intel SGX) where operations can be performed on the data behind encryption for privacy. The trust in this setup comes from having the data in a decrypted state and having to rely on the surrounding “enclave” to be secure. If you did not create this area, if it is proprietary, then you are trusting it is secure.
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