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. 2019 Aug 14;21(8):e13600. doi: 10.2196/13600

Figure 7.

Figure 7

Typical client-server homomorphic encryption (HE) pipeline. Raw data ownership is maintained client-side but inaccessible to other parties. HE is limited for the feature engineering use case because it requires decryption as a last step. If researchers are provided the ability to decrypt the feature data from step 5, then they would also have the ability to decrypt the raw, sensitive data from step 1.