“The only truly secure system is one that is powered off”

—  Gene Spafford

"Computer Recreations: Of Worms, Viruses and Core War" by A. K. Dewdney in Scientific American, March 1989, pp 110.
Context: The only truly secure system is one that is powered off, cast in a block of concrete and sealed in a lead-lined room with armed guards - and even then I have my doubts.

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Gene Spafford 9
American computer scientist 1956

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