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> Before shredders got good.

I would expect shredders these days to be easily defeated with a scanner and some clever algorithms. Is that not the case?

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There was a DARPA challenge for this a few years ago [1]. But I would think that it would not be hard to make a shredder that could make reassembly impossible if the shredded pieces are small enough.

1. https://en.m.wikipedia.org/wiki/DARPA_Shredder_Challenge_201...

The book “Billion Dollar Spy” describes the CIA’s shredder in the Cold War era Moscow station as turning documents into powder.

A safety match would do this in the real world and be much cheaper.

_Good_ shredders ingest a stack of paper several cm high and output powder.

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