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A comment on Homomorphically encrypted CIFAR-10 inference in 200ms. Parent comment

Re:Homomorphically encrypted CIFAR-10 inference in 200ms by j2kun on Friday July 17, 2026 @03:49PM (#48951560)
> 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.

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Re:Homomorphically encrypted CIFAR-10 inference in 200ms by smalltorch on Friday July 17, 2026 @04:10PM (#48951757)
Interesting. 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?

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Re:Homomorphically encrypted CIFAR-10 inference in 200ms by larrygates on Friday July 17, 2026 @04:49PM (#48952146)
Good primer on FHE here: https://eurocrypt.iacr.org/2021/slides/gentry.pdf
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Re:Homomorphically encrypted CIFAR-10 inference in 200ms by furkanturan on Friday July 17, 2026 @04:52PM (#48952179)
Check this one too: https://openmined.org/blog/ckks-explained-part-1-simple-enco...
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Re:Homomorphically encrypted CIFAR-10 inference in 200ms by mswphd on Friday July 17, 2026 @08:08PM (#48953745)
this 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).
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Re:Homomorphically encrypted CIFAR-10 inference in 200ms by Pro7ech on Saturday July 18, 2026 @07:37AM (#48957111)
In 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.
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