3 ms·
> gaining any sort of insight The server providing the FHE-based service does not gain any sort of insight. This is a key point: only the client can see the ou
by j2kun 3mo ago
> gaining any sort of insight
The server providing the FHE-based service does not gain any sort of insight. This is a key point: only the client can see the output of the computation.
- smalltorch 3mo agoInteresting. I have some homework to do then. Do we have to close our eyes and look away for it to be true or does it really not gain any insight? Where can I find out more about how this could be possible?
- larrygates 3mo agoGood primer on FHE here: https://eurocrypt.iacr.org/2021/slides/gentry.pdf https://eurocrypt.iacr.org/2021/slides/gentry.pdf
- furkanturan 3mo agoCheck this one too: https://openmined.org/blog/ckks-explained-part-1-simple-encoding-and-decoding/ https://openmined.org/blog/ckks-explained-part-1-simple-enco...
- mswphd 3mo agothis is only true in the IND-CPA model for most "practical" FHE work. So a more precise way to describe things is "a server who faithfully performs the task given to them does not gain any sort of insight" (perhaps with an additional caveat about decryption failures).
- Pro7ech 3mo agoIn the case of single key FHE with server-side processing (the demo setup), the server can never gains any insight, even as an active adversary that can arbitrarily deviate from the protocol because it only has access to public evaluation keys and ciphertexts. The worst it can do is return tempered output to the client, but it doesn't help it learning anything about the client request.