19 Oct '15, 2pm

TEMPEST: a Tin Foil Hat for Your Electronics and Their Secrets

Back in the mid-70’s, I worked for a firm [Q1] that made a series of desk [built into] computers. When the military looked at using them for word processing, they discovered that the way our display [multi-line plasma] worked, they could not get any intelligence from the signals from the display, as opposed to the CRT’s that were in common use at the time. We used a daisy wheel printer, and even that was almost impossible to get info from while it was printing, due to the x & y paper/print head motions, as well as that of the daisy wheel occurred at the same time, with the print hammer firing only when the 3 other operations had all completed – effectively randomizing the wheel position of the character being printed. The best part was when they asked about a ‘core-clear’ program [needed in magnetic core memory computers] to remove any classified content in the memory, and...

Full article: http://hackaday.com/2015/10/19/tempest-a-tin-foil-hat-for...

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