Subj : linear compressed morse code
To   : all
From : warmfuzzy
Date : Tue May 07 2024 17:25:47

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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