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FHE Prompt Privacy
A private-inference demo can be honest about FHE and still leak the user's workflow. The prompt body may be encrypted before it leaves the client, and the server may still learn that the user called /risk-score every morning with a four-kilobyte ciphertext and a medical model identifier. FHE Prompt Privacy hides selected plaintext inside a selected computation; FHE Prompt Privacy does not automatically hide request shape, routing, timing, logs, model choice, or the text later released as output.
The developer mistake is treating "the provider cannot read the prompt" as "the session is private." That sentence skips the part where privacy lives in the surrounding system. A useful review of FHE Prompt Privacy starts with the encrypted field, then walks outward until every observer, log, and reveal step has a name.
