4 ms·

However, jamming apparatus can be tracked down just as well. Would we be seeing anti-ECM trained triangulation teams of the police?

by iwwr 15y ago

tptacek 15y ago
With significant advanced prep. No local law enforcement agency is ready to deal with an adversary who shuts their comms down tactically.
rdl 15y ago
Also, there is detailed in the paper a $15 toy (the girltech imme) which can be reflashed to work as a jammer. There is a huge signal strength advantage to the attacker (13dB) vs. a regular transmitter. You could make $100 (with amp, antenna) disposable jammers, powered ~forever by some batteries, and just replace them every few years when discovered. There's also a purely-passive direction finding thing for all radios (active or not); I remember a Dutch guy created a "fuzz meter" which would ID local cops; trivial to do with this description of the P25 protocol.
wglb 15y ago
Triangulation of interference can be a time-consuming process. Like my EE professor (who spent the war years building $100 radar jamming tools that rendered million-dollar radar sets inoperative) said, the odds are stacked in favor of the jammer. A crude example is a ham-radio fox hunt. A radio is hidden somewhere in a pre-agreed area and teams of foxhunters are set loose once the fox ready to go. If the fox is exactly one transmitter and its power is steady, it can still take the better part of an hour, for example, to locate a fox hidden within a one block area. So increase the ability of the trackers, say with doppler direction finders mounted on roofs. Now the jammers can do the following things to continue to wreak havoc. 1) Vary the power in 3db steps, perhaps in a loose random fashion. Fox-hunting techniques include rotating an antenna and pinpointing where signal strength peaks. 2) Using carefully time-syncronized jamming boxes, scatter three or four of them around the area and have them turn take turns being on. Or have two out of three on in some overlapping way. 3) Combine 1&2. 4) Oh, make them mobile.

However, jamming apparatus can be tracked down just as well. Would we be seeing anti-ECM trained triangulation teams of the police?

by iwwr 15y ago

However, jamming apparatus can be tracked down just as well. Would we be seeing anti-ECM trained triangulation teams of the police?

tptacek 15y ago

With significant advanced prep. No local law enforcement agency is ready to deal with an adversary who shuts their comms down tactically.

rdl 15y ago

Also, there is detailed in the paper a $15 toy (the girltech imme) which can be reflashed to work as a jammer. There is a huge signal strength advantage to the attacker (13dB) vs. a regular transmitter. You could make $100 (with amp, antenna) disposable jammers, powered ~forever by some batteries, and just replace them every few years when discovered. There's also a purely-passive direction finding thing for all radios (active or not); I remember a Dutch guy created a "fuzz meter" which would ID local cops; trivial to do with this description of the P25 protocol.

wglb 15y ago

Triangulation of interference can be a time-consuming process. Like my EE professor (who spent the war years building $100 radar jamming tools that rendered million-dollar radar sets inoperative) said, the odds are stacked in favor of the jammer. A crude example is a ham-radio fox hunt. A radio is hidden somewhere in a pre-agreed area and teams of foxhunters are set loose once the fox ready to go. If the fox is exactly one transmitter and its power is steady, it can still take the better part of an hour, for example, to locate a fox hidden within a one block area. So increase the ability of the trackers, say with doppler direction finders mounted on roofs. Now the jammers can do the following things to continue to wreak havoc. 1) Vary the power in 3db steps, perhaps in a loose random fashion. Fox-hunting techniques include rotating an antenna and pinpointing where signal strength peaks. 2) Using carefully time-syncronized jamming boxes, scatter three or four of them around the area and have them turn take turns being on. Or have two out of three on in some overlapping way. 3) Combine 1&2. 4) Oh, make them mobile.