This method of sending information to a Russian Embassy has been used in

This is fascinating. I imagine a use case for something like this in packet radio.

That is, adapting a system like this where a user from a computer requests a mainstream website on packet packet radio. Configure the browser to use the local node as a proxy. Pre-written software would automate the request by converting it to morse, compressing it, playing it into a wav file, compressing it as described by the OP, then:

Requester: Outbound traffic compressed binary
Requester: transmitted
Receiving endpoint: receive
Receiving endpoint: decompress
Receiving endpoint: translate data to outbound web request
Receiving endpoint: proxy the request
Receiving endpoint: outbound return
Receiving endpoint: package response data & transmit
Requester: receives response packet
Requester: displays data on browser

I wonder if this could conceptually work.

Daniel

... Just another prisoner of gravity!

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This method of sending information to a Russian Embassy has been used in real-world espionage. Sounds strange or of intrigue? It is. The idea is very simple and it works really well. All you need to do is download a morse code training app in which you can have the software "speak" the morse code into a .wav or other audio file, however .wav is best because it is not compressed. The compression comes later. First you get the software to read several thousands of words read out into an audio file. Then you use linear compression to change the two hours of morse code into a burst of a few seconds, maybe in as little as 10 seconds. Without continual monitoring of the radio frequency emissions surrounding the embassy this would completely go unnoticed. So a person would record their message into a .wav audio file and use freeware audio software like Audacity to compress the audio in time, so rather than having morse at standard speed taking two hours, it can be compressed in time to about ten seconds. The gaps between morse code letters is made so small that its compressed to a form taking only a few seconds. At the same time the signal that is transmitted is not lossy, but containing each pack of several thousand words in a short period of time and keeping the message intact. This is called "linear compression" where the signal is compressed without signal degredation, just having the beeps closer to the other beeps. The intelligence agent would record the morese code via a morse code training application that gets saved to a .wav file, they would then use Audacity to do linear compression and the audio would be saved in a .flac audio file. The agent would load the audio into his or her HiFi audio player.
They would then use a common radio transmitter through which the audio player plays the "squirt transmission." This might be a CB radio, and Amateur Radio kit, and FM transmitter, or something along those lines. They would then drive past the embassy, slow down a little bit, engage the audio player through the transmission device, and the message is passed to their controller, no one the wiser.

I learned about this from reading some history of espionage. This is real life stuff which has actually taken place. Even present day stuff has not bested this method as its simple and not needing much training for this at all---it's quick and simple indeed.

Cheers!
-warmfuzzy

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Re: linear compressed morse code
By: warmfuzzy to all on Tue May 07 2024 05:25 pm

I learned about this from reading some history of espionage. This is real life stuff which has actually taken place. Even present day stuff has not bested this method as its simple and not needing much training for this at all---it's quick and simple indeed.

The British War Museum has exhibits going back to the battle of Agincourt in the 1400s, the Falklands war and everything in between. They have a whole section devoted to cold-war spycraft that's very interesting - think Maxwell Smart and old James Bond, but real life. Worth a visit if you're in London.
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