re tempest res colnet cmhnet org rob stampfli writes wouldn t a a second monitor of similar type scrolling gibberish and adjacent to the one being used provide reasonable resistance to tempest attacks we ve got a tempest receiver in the lab here and there s no difficulty in picking up individual monitors their engineering tolerances are slack enough that they tend to radiate on different frequencies even where they overlap you can discriminate because they have different line synch frequencies you can lock in on one and average the others out the signals are weird in any case with varying polarisations and all sorts of interactions with the building just moving a folded dipole around is also highly effective as a randomised means of switching from one monitor to another ross
