Bill Stewart writes:
Also, of course, your electrical power system needs to be shielded and filtered, so only 60Hz gets through, unless you plan to stick to laptops and bring in spare battery packs.
At HoHoCon a few years ago, someone did a tempest demo and mentioned that signals could be recovered from water pipes! Fire sprinkler systems were specifically mentioned...
Water pipes are often form the earth line. If only 60hz (US) can get through the power cables then only 60 hz can get into the water pipes (I'll ignore re-radiating, because water pipes are the least of your problems there). -- "Of all tyrannies a tyranny sincerely exercised for the good of its victims may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies, The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for own good will torment us without end, for they do so with the approval of their own conscience." - C.S. Lewis, _God in the Dock_ +---------------------+--------------------+----------------------------------+ |Julian Assange RSO | PO Box 2031 BARKER | Secret Analytic Guy Union | |proff@suburbia.net | VIC 3122 AUSTRALIA | finger for PGP key hash ID = | |proff@gnu.ai.mit.edu | FAX +61-3-98199066 | 0619737CCC143F6DEA73E27378933690 | +---------------------+--------------------+----------------------------------+