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A comment on The Big Hack: How China Used a Tiny Chip to Infiltrate Amazon and Apple. Parent comment

Re:The Big Hack: How China Used a Tiny Chip to Infiltrate Am... by ycmbntrthrwaway on Thursday October 04, 2018 @08:44AM (#18139355)
> We could not measure all possible angular momentums but it was possible to measure one or two that would not be known to the attacker.

You only need to measure three angular momentums, all other can be calculated. See https://en.wikipedia.org/wiki/Moment_of_inertia#Motion_in_sp...

"This shows that the inertia matrix can be used to calculate the moment of inertia of a body around any specified rotation axis in the body."

On the attacker side, they only need to make sure three angular momentums match.

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Re:The Big Hack: How China Used a Tiny Chip to Infiltrate Am... by gnode on Thursday October 04, 2018 @08:52AM (#18139402)
Maybe they're also measuring centrifugal force for rotations with axes not intersecting the centre of mass.
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