Subj : Ghetto Covert Channels
To   : All
From : warmfuzzy
Date : Fri Jul 06 2018 21:47:04

Have you ever thought to yourself, "wouldn't it be cool if I could send
someone a communication without it being detected and without having some 
super elite kit?"  That will be described here.

Tools:
- $400-$1200 : computer
- $FREE : morse code generator like Morse Cat or something similar
- $400 Hi-Fi WAV/FLAC player
- $FREE : Audacity audio editor
- Specs of lower quality may still work with this
- $140 Whole House FM Transmitter

Here' how:
- use the morse code generator to beep out the full message from your text,
recording this to a WAV or FLAC file.
-  compress the wave so it compresses the audio in time, so  a beepout that
took 5 minutes can be shrunk to 10 seconds
- copy this (uncompressed) to your HiFi FLAC/WAV player
- plug your audio player into the Whole House Transmitter
- turn on the Whole House Transmitter right upon nearing your destination 
- press play on the music player, transmitting for the 10 seconds only, maybe
this will result being on air for up to 15-20 seconds but you should try to
keep it to a minimum.
- turn everything off and drive away

You are now a Ghetto Homey-G kid with some mad skillz :)

This is for educational purposes only,  and if you do follow these
instructions please don't transmit anything illegal in any way, shape, or
form.

This has the following benefits:
- Its on the FM band so your signal can be lost in the great variety of
stations - Its fast, this would quality as a "burst transmission"
- its cheap and you don't have any government kit to expose your
affiliations with
- There's nothing illegal about this setup, apart from what you might transmit
- the transmission is low enough power that it won't propagate very far, just
far enough to reach a builing a few 20-40 meters away (depending on the
antenna used for FM reception).
- you could setup a time/place to do the transmission so that both you and
your friend are near each other for a very short period of time.

I hope that this makes you think just how easy a Ghetto Covert Channel can be
to make and surprisingly, how completely legal it is.  Once a person has
mastered the description of the system above you can probably use this same
setup more efficiently compressing a half hour or so into ten seconds.

source: open source research

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