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The xz backdoor, read through Lighthouse's three layers
The question
What would Lighthouse’s three layers have shown during the documented xz backdoor event, and which carried the first detectable signal?
What the record says
In this retrospective case reading, malicious tarballs were public before recognition, while memory-checking errors and later ssh overhead supplied activity-layer signals. The earlier errors were answered by the backdoor’s author; the later investigation exposed the backdoor.
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