Why it matters
FHE is holy grail but not practical for LLM yet. Understanding shapes future.
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The architecture
FHE schemes: BFV, CKKS, TFHE.
Overhead: 10^3-10^6x for LLM ops.
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How it works end to end
Research: encrypted embedding lookup, encrypted linear layers.
Full LLM FHE impractical.
Hybrid: FHE + confidential compute.