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A comment on Google’s Fully Homomorphic Encryption Compiler – A Primer. Parent comment

Re:Google’s Fully Homomorphic Encryption Compiler – A Primer by Dylan16807 on Tuesday February 14, 2023 @02:27AM (#34786491)
> I imagine ignoring the bits that don't change would be some sort of security vulnerability? You could probably work out some timing attack or entropy reduction otherwise?

Nah. The bits are hardcoded into the circuit to not change. That's part of the program, and the program is public information. Only bit 6 of each byte might change, and everyone knows it.

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Re:Google’s Fully Homomorphic Encryption Compiler – A Primer by squeaky-clean on Wednesday February 15, 2023 @09:44PM (#34814315)
Whoa, I never knew about the ascii 6th bit trick, I've never really considered capitalization wasn't some random offset. So that does make this circuit simpler than I thought it was, and there's the parallelism aspect. It's not so surprising now that it's faster than the add.
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