> Why would they be trivially hackable? They're on a private network with 
> end-to-end hardware-keyed encryption, locked in a box that needs two keys 
> to open.

And I heard somewhere that if the box (the physical ATM) detects it is being 
tampered with it self-destructs any sensitive data automatically (eg the 
keys used to calculate your PIN number).  And probably releases an ink 
cartridge to cover all the notes...

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