LLM 'clean room' reimplementations aren't clean rooms: one person on both sides can't prove separation
kristoph · x · 2026-10-08
Developer kristoph flagged the flaw in LLM-assisted 'clean room' reimplementations: if you have an LLM decompile an app into a specification, then have it rebuild the filter in Rust from that spec, there is no clean room — the same person sits on both sides and can't prove they didn't use the decompiled code directly.
Proper practice requires at least two people working independently: one exposed to the protected code producing a spec, the other implementing only from the spec. Directly relevant to compliance risk for reimplementations in the LLM era.
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