I once broke up a fight at a major company I worked for between two PhDs. “Then the design will never be completed,” he said. “And what if I assign a hundred PhDs to it?” “But we need this system immediately or even sooner! How long will it take if I assign ten engineer’s with masters degrees to it?” “It will take one year,” said the Master promptly. The manager asked the Master: “How long will it take to design this system if I assign five engineers to it?” Posted in Featured, History, Slider Tagged bug, bugs, nljd, nonlinear junction detector, spies, spy, spytech Post navigationġ00s? To paraphrase the Tao of Programming:Ī manager went to the Master Engineer and showed him the requirements document for a new design. The amount of tech that goes into hiding them and finding them is a largely unknown race that might even dwarf the space race. With computers and cell phones everywhere, you really don’t need to plant a bug anymore, do you? You just need to compromise the subject’s device and in many ways, that’s even easier to do.Ĭovert bugging is nothing new. However, there’s a bigger reason these aren’t as useful as they once were. So for serious spies, the NLJD might not be very useful anymore even though more common bugging devices might still be susceptible to detection. So much so that, since around 1968, CIA devices like the SRT-107 seen here have special filters in them to shunt the probe signal to ground.
However, the spy use of it became evident. The NLJD wasn’t originally a spy device. invented it during World War II for discovering corrosion below painted surfaces on airplanes.
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There’s some example software at the bottom of that page for the Basic Stamp II, so while it would not be trivial to replicate, it does look like there’s enough info there to experiment if you are interested. There are detailed photos of the construction, though and quite a bit of data, so it seems like the device exists.ĭon’t forget to look at part two of the post. It says under development and doesn’t show any examples of it in use, so we don’t know if it performs well or not.
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The only clear example we could find was on an unusual site full of underground projects. There aren’t many homebrew NLJDs and we don’t know why. You’d like to think a clever hacker could do better. Of course, the commercial units have other features, but that’s still a lot of money. We did see an Orion listed for over $14,000. The more mainstream versions all want you to ask for the price and we decided not to get on any CIA watch lists by asking. Even on the usual Chinese import sites, the good-looking models run about $10,000.
Apparently, by looking at the ratio of the second and third harmonics, an experienced operator (or a smart computer) can differentiate between a rusty nail and a real piece of electronic equipment. In broad terms, the operator gets an idea of any radio sources in the area first, to try to avoid false positives. It is a little more involved than in the movies.
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You can get an overview of how a pro uses an NLJD. So in addition to bugs and cell phones, you’ll detect rusty nails and similar items. The other problem is that any dissimilar metal junction will exhibit nonlinear behavior. It also shouldn’t be so powerful that you can’t localize the volume or - extremely - that it would damage circuits. Sounds simple, but the RF has to be powerful enough to get there and produce a harmonic you can detect. They might be at a low level, but if you can detect the harmonics, you can identify these junctions. However, anything that has a nonlinear response - like a diode junction - will emit harmonics. Normal insulators and conductors in the area won’t alter the signal. The idea behind an NLJD is to flood a volume with an RF signal at a particular frequency. You can see a video of a commercial NLJD, below Their claim to fame is the device doesn’t have to be turned on for detection to occur. Spy agencies in the United States, Russian and China have been known to use them and prisons employ them to find cell phones. These are called Nonlinear Junction Detectors (NLJD). High-end bug detectors have another technique they use that claims to be able to find active device junctions. Or perhaps it records to memory and doesn’t transmit anything. But what if the bug were more sophisticated? Maybe it wakes up every hour and beams its data home. The lamp probably shouldn’t be emitting RF energy all the time, so that’s easy to detect and a dead give away. If you had a bug that transmits all the time, that’s easy.
Of course, as a hacker, you have to start thinking about how that would work. If you ever watch a spy movie, you’ve doubtlessly seen some nameless tech character sweep a room for bugs using some kind of detector and either declare it clean or find the hidden microphone in the lamp.
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