re tempest in apr ringer cs utsa edu whughes lonestar utsa edu william w hughes writes hell just set up a spark jammer or some other very electrically noisy device or build an active farrady cage around the room with a noise signal piped into it while these measures will not totally mask the emissions of your equipment they will provide sufficient interference to make remote monitoring a chancy proposition at best there is of course the consideration that these measures may and almost cretainly will cause a certain amount of interference in your own systems it s a matter of balancing security versus convenience the problem is that this will also cause a certain amount of interference in all systems within the range of the device a long time ago i built a small jammer to dissuade my brother from using his radio alarm clock at something like am which had just enough range to cover my room and his however something powerful enough to mask all or at least most emissions from your computer equipment is also going to knock out half your neighbourhoods radio and tv reception this isn t going to make you many friends incidentally an older model trs makes a fine wideband jammer grin peter pgut cs aukuni ac nz p gutmann cs aukuni ac nz gutmann p kosmos wcc govt nz peterg kcbbs gen nz peter nacjack gen nz peter phlarnschlorpht nacjack gen nz in order of preference one of em s bound to work everything was so different before it all changed
