Ohio prisoners built a computer from parts and hacked the prison network
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https://www.theregister.co.uk/2017/04/12/prisoners_built_computer_connected_to_states_network/
I'm kind of impressed. I get that out of parts they could find a working hard drive, but it probably had a civilian copy of Windows on it and not much else. I wonder how they got the software they needed to access the prison applications.