The Numbers Stations Analyzed, Discussed

GMontag wrote to mention a Washington Post article about the always-intriguing 'number' radio broadcasts. The numbers stations, as they are known, are 'hiding in plain sight' spycraft. Random digits broadcast at little-used frequencies are known to be intelligence agencies broadcasting their secrets in encrypted form. The Post article gives a nice run-down on the truth behind the transmissions, and touches a bit on the odd community that has grown fascinated by them. From the article: "On 6840 kHz, you may hear a voice reading groups of letters. That's a station nicknamed 'E10,' thought to be Israel's Mossad intelligence. Chris Smolinski runs SpyNumbers.com and the 'Spooks' e-mail list, where 'number stations' hobbyists log hundreds of shortwave messages transmitted every month. 'It's like a puzzle. They're mystery stations,' explained Smolinski, who has tracked the spy broadcasts for 30 years." This article made me recall a great All Things Considered story from a few years back about Akin Fernandez's 'Numbers' CD, a CD compilation of some of the most interesting strings of randomly read numbers reaching out across the airwaves.

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[TechnoLust (528463)]

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[quokkapox (847798)]

In Soviet Russia, this would be modded "Informative".

Re:1258965

[Mozk (844858)]

Oh my god... The single funniest and most fitting Soviet Russia joke I have ever seen. People looked at me weird because I was laughing at a computer.

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[nmb3000 (741169)]

8675309

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[Servo (9177)]

42

Slash has its own numbers station

[LiquidCoooled (634315)]

It was discussed on slash previously in the following article:

Numbers Stations Move From Shortwave To VoIP [slashdot.org].

I've picked these up on short wave

[andy314159pi (787550)]

If you have a cheap short wave radio, even a "radio shack" one, you can pick up voice audio coded messages to spies that the CIA sends to agents. You will only find them by pure chance, but I have managed to find them and record them but I would say that for every 6 or 8 months of listening to short wave radio I will hear only 1 of these broadcasts. It's usually the same female voice. It's great fun when you find one, you feel like you hit the lottery.

Re:I've picked these up on short wave

[Konster (252488)]

I won the lottery.

Twice.

I spent a lot on booze and whores.

I wasted the rest.

Re:I've picked these up on short wave

[lowe0 (136140)]

Dude, a slashdotter said he heard a female voice. That's pretty much the same as winning the lottery around here.

Re:CIA? I suspect not.

[hazem (472289)]

If you are in the US military and go to the language school in Monterey, a big portion of your "lab" training is learning how to transcribe groups of numbers read in your target language. It's a big part of your "grade" in your coursework.

Now, it's hard to say if the US transmits numbers, but it's pretty clear that there appears to be some intelligence value in teaching the electronic warfare people how to listen to streams of numbers in other languages.

It's probably a great way to send one-way messages to the field. A simple AM radio can be modified work in different frequencies. With that and a normal-looking one-time-pad code book can go a long way to providing secure communication that is inconspicuous.

So, the CIA might not do it, but other countries and services probably do.

HF, VHF, UHF...

[Kadin2048 (468275)]

You're correct, but just in the interests of preventing confusion, the idea of what was a "long wave" in the early 20th century was very different from what an electrical engineer might think of today. What are today rather low frequencies for radio communication were at the time rather high, hence the term 'short waves.' The preferred frequencies for communication at the time are now barely used by anyone, with the possible exception of naval communication with submarines and the like. Their data-carrying capacity is just too low, and the antennas they require are obnoxiously large.

Of course, by calling things in the 1-30 MHz range "high frequency," those engineers forced us to use such terms as "very high frequency," and "ultra high frequency" when equipment finally became capable of transmitting at those wavelengths.

There was a BBC radio programme about this...

[terrencefw (605681)]

There was a BBC radio programme about this a few months ago:

http://jamesholden.net/2005/04/23/the-lincolnshire -poacher/ [jamesholden.net]

Shortwave

[finalbroadcast (1030452)]

As an avid Shortwave fan, there are less and less clear stations broadcasting to NA, as more and more world service broadcasts move to the Internet. (YEAH I'm talking about you BBC) I wonder how long until the only people who own shortwave radios are spies? Although propaganda stations are well worth the price of the radio. Listen to Cuba's hour loop of things we blame on the US today, and keep a straight face, I dare you.

Source code

[mcrbids (148650)]

I don't know if I should do this - releasing secrets from the FBI like this commonly leads to life in Gitmo Bay - but information wants to be free!

The "numbers" stations only exist to confuse people. On Wednesdays, we have "beer" day, where you are entitled to a beer from the cooler if the number 12725 comes out.

So we had one day, last year, where somebody (I think it was the Chinese) hacked our main server, and made it broadcast 12725 continuously all day. So there we were, plastered out of our mind, when 270 Lbs of fissionable material was stolen from our floor. The investigation is due to be completed sometime around 2021 - we don't talk about that very much.

Anyway, here's the source code:

#! /bin/sh
cat /dev/urandom > /dev/bcast;

Information wants to be free!

Ad revenue

[Kennric (22093)]

With these stations becoming so popular, isn't it time to sell ads? After all, spy agencies can always use the extra cash, and the people who listen to these things probably constitute a solid geek demographic.

Or worse:

1) Create personal numbers station with especially intriguing sequences to draw audience
2) Sell ads on your personal number station
3) Profit! ... why do I feel like I've missed a step there?

4 8 15 16 23 42

[GaelTadh (916987)]

four eight fifteen sixteen twentythree fortytwo

Conet Project MP3 Download

[3mpire (953036)]

You can download the mp3's for free: http://irdial.hyperreal.org/the%20conet%20project/ [hyperreal.org]

Try cracking a "numbers station" on your own

[chrisgagne (605844)]

For those of you who like this sort of thing, check out 202-386-6909 and http://code-cracker.cerbumi.org [cerbumi.org]. This is a test project that I developed for Cerbumi.org, a new and entirely non-commercial (no ads, fees, etc) website designed to help with real-world problem solving. (Think of it as a "Sourceforge.net" for projects like the "Open Prosthetics Project." [openprosthetics.org]) The first person to solve the puzzle and post the answer to the code-breaker project can choose where the Cerbumi.org team will make a $100 donation on their behalf.

If this sounds like fun, please consider signing up for the Cerbumi.org site at http://public.cerbumi.org/goons [cerbumi.org] (a "secret back door for a site that normally requires registration) and try to crack the code. Also, please consider checking out the main planning project at http://cerbumi.cerbumi.org [cerbumi.org] and our Flash-based demo at http://cerbumi.org/flash [cerbumi.org]. I'd love to hear your thoughts, too... just reply. :)

Re:IP Addresses

[Rosco P. Coltrane (209368)]

Actually no, it's spies reading the content of a suspicious #chatzone IRC log file, only they don't quite get it. See for example this transcript:


C0016UY: 1337641: 69?
1337641: 637 1057!

Re:IP Addresses

[Xaroth (67516)]

A translation for the weak of leet:

A fine, upstanding gentleman: Dearest, skilled lady... wouldst thou join me in mine bedchambers for some chaste frolicking?
Skilled lady: Alas! No, I must not! For thou art neither truly updstanding, nor the gentleman thou claim'st to be. Now, leav'st me be posthaste!

Re:IP Addresses

[mrogers (85392)]

What's 1057?

The joke. On you.

Re:Time Bomb.

[Detritus (11846)]

A quantum computer is useless against a message encrypted with a properly constructed one-time pad.

Re:Time Bomb.

[FooAtWFU (699187)]

There's a couple ways to generate one-time pads. The first I read was described at HotBits [fourmilab.ch]. They take a little radioactive bit of cesium, and a radiation detector which can detect atomic decay:

What we do, then, is measure a pair of these intervals, and emit a zero or one bit based on the relative length of the two intervals. If we measure the same interval for the two decays, we discard the measurement and try again, to avoid the risk of inducing bias due to the resolution of our clock.

You can find more at Wikipedia's article on hardware random number generators [wikipedia.org]:

There are two fundamental sources of practical quantum mechanical physical randomness: quantum mechanics at the atomic or sub-atomic level and thermal noise [wikipeda.org] (some of which is quantum mechanical in origin). Quantum mechanics predicts that certain physical phenomena, such as the nuclear decay [wikipeda.org] of atoms, are fundamentally random and cannot, in principle, be predicted. (For a discussion of empirical verification of quantum unpredictability, see Bell test experiments [wikipeda.org].) And, because we live at a finite, non-zero temperature, every system has some random variation in its state; for instance, molecules of air are constantly bouncing off each other in a random way. (See statistical mechanics [wikipeda.org].) This randomness is a quantum phenomenon as well. (See phonon [wikipeda.org].)

Because the outcome of quantum-mechanical events cannot in principle be predicted, they are the 'gold standard' for random number generation. Some quantum phenomena used for random number generation include:

• Shot noise [wikipeda.org], a quantum mechanical noise source in electronic circuits. A simple example is a lamp shining on a photodiode. Due to the uncertainty principle [wikipeda.org], arriving photons create noise in the circuit. Collecting the noise for use poses some problems, but this is an especially simple random noise source.

• A nuclear decay [wikipeda.org] radiation source (as, for instance, from some kinds of commercial smoke detectors [wikipeda.org]), detected by a Geiger counter [wikipeda.org] attached to a PC.

• Photons [wikipeda.org] travelling through a semi-transparent mirror [wikipeda.org], as in the commercial product, Quantis from id Quantique SA. The mutually exclusive events [wikipeda.org] (reflection -- transmission) are detected and associated to "0" or "1" bit values respectively.

Thermal phenomena are easier to detect. They are (somewhat) vulnerable to attack by lowering the temperature of the system, though most systems will stop operating at temperatures (e.g., ~150 K) low enough to reduce noise by a factor of two. Some of the thermal phenomena used include:

• thermal noise [wikipeda.org] from a resistor [wikipeda.org], amplified to provide a random voltage source.

• Avalanche noise [wikipeda.org] generated from an avalanche diode [wikipeda.org], or Zener breakdown noise from a reverse-biased zener diode [wikipeda.org].

Re:Shortwave Station Leaders - nothing sinister

[Hasai (131313)]

I beg to disagree. Number stations are quite real. What possibly confused you is how some number stations operate.

Take the old Radio Moscow transmitter in East Berlin, for example. You are quite right that such HF broadcasts would often end with a looping tape containing info on what freq(s) the site would be transmitting next. Well and good.

Eventually, though, the tape ends and the transmitter shuts down. Fine. Now all you're listening to is a whole lot of nothing but white noise, right? STAY ON THE FREQ FOR ANOTHER 5-10 MINUTES. Suddenly another carrier comes up, and a woman's voice starts. On the Radio Moscow freq she would always start with "Achtung, achtung," then proceed to read-off a long string of number groups (NOT freqs!). When done, she would finish with "Ende," and the carrier would immediately drop.

Still sound like a freq change notice to you? :)

Re:Triangulation to locate sources?

[Macgyver7017 (629825)]

Not to be rude, but I call BS.

The number of reflections that an HF signal would undergo in a decade of bouncing around anything the size of the earth, is simply astronomical. The efficiency of reflection would have to be similarly astronomical.

Let alone enough of the signal staying intact to still hear several seconds of it (enough to identify it as Vietnam chatter).