From warmfuzzy@700:100/0 to All on Sat Jun 9 00:21:01 2018
Several years back the Russians found out about an electronic dead-drop in
one of their parks. It was sort of like a store and forward device where agents would leave messages with their handlers. They would simply walk
slowly past the spy rock (a small computer hidden inside a hollowed out rock
at the side of the trail) and their phones would pick up the radio signal and save the data that was waiting for them, and send prepared notes back to the rock. How could this have been found? Well it would probably be susceptible to metal detectors and near field receivers (that pick up signals in a way where its exact transmission point can be found).
How can the system be fixed so that security intelligence organizations/ agencies don't detect the "trading post?" Well first off the
initial ping to the device should be from the cell phones and not from the rocks, and there should be a code that the phones send to the rock to make absolutely certain that the portable device is actually an authorized communication device before initiating transmissions. Second all metal parts that can be made of plastic rather than metal should be switched, furthermore if the security agency really wants to stay safe they should replace some of the larger circuit boards with aluminum traces (electronic circuits), which
is not something that responds to magnetism, so a metal detector would not work.