Homomorphic encryption and trusted execution environments (TEEs) provide full protection for local models and partial protection for global models, according to Table 6.4.

In Table 6.4, these two techniques are marked with a full-protection symbol for local models and a half-protection symbol for global models. Homomorphic encryption allows computations on encrypted data, fully securing individual contributions while only partially shielding the aggregated global model. Trusted execution environments similarly protect local computations fully through secure hardware enclaves, but global model protection is only partial.

Key points

Homomorphic encryption: full local model protection, partial global model protection.
Trusted execution environment (TEE): full local model protection, partial global model protection.
Both techniques appear in Table 6.4 with the same protection pattern.
Secure aggregation and functional encryption fully protect local models but do not provide partial global protection according to the table.

According to Table 6.4, which privacy-preserving technologies provide full protection for local models and partial protection for global models?

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