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Comment on In some countries (such as the USA), sending encrypted communications via Amateur Radio is illegal, but how likely will the government actually enforce it, and how severe would the consequences be?

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SnotFlickerman@lemmy.blahaj.zone ⁨1⁩ ⁨week⁩ ago

Actually, this idea has some merit, because it already has examples in other mediums. It’s technically referred to as “steganography.”

A common example with computers is hiding text, files, or applications within an image file.

github.com/7thSamurai/steganography

In the example for how to use this simple Image Steganography tool, the user hides a ZIP files with the entire contents of the book Dr. Jekyll & Mr. Hyde into the example image.

I don’t see why something similar couldn’t be achieved with audio.

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AwesomeLowlander@sh.itjust.works ⁨1⁩ ⁨week⁩ ago
Not an expert, but I’m not sure steganography would be compatible with analog lossy data transmission methods like ham radio. The examples you linked relate to digital lossless audio, where it’s easy to hide the data in individual bits.

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- Deestan@lemmy.world ⁨1⁩ ⁨week⁩ ago
  It’s fine, but you need to have an error correction layer.
  
  Digital-over-analog methods like QR codes or modems are some examples.
  
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  - AwesomeLowlander@sh.itjust.works ⁨1⁩ ⁨week⁩ ago
    I mean, it’s certainly possible. But given that you’re trying to keep the audio as legible speech, the bandwidth would probably be horrendous.
    
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    Deestan@lemmy.world ⁨1⁩ ⁨week⁩ ago
    Yeah for sure! I’d be happy to encode a single word in a minute of audio.
    
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- evasive_chimpanzee@lemmy.world ⁨1⁩ ⁨week⁩ ago
  There’s a whole bunch of different steganographic methods. You wouldn’t necessarily have to apply them to audio signals, you could apply them to the text itself. It’s certainly trickier, so you would want to keep the plain text very short so your ciphertext doesn’t get too long or weird
  
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  - AwesomeLowlander@sh.itjust.works ⁨1⁩ ⁨week⁩ ago
    Sounds more like you’re using codewords and phrases at that point? Or do you mean something different?
    
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    evasive_chimpanzee@lemmy.world ⁨1⁩ ⁨week⁩ ago
    I’m not clever enough to come up with a good example on the spot, but you could have something along the lines of a scheme where the word selection corresponds to a not-obvious code. For example, if you wanted to secretly send the word “hello”, and you’ve previously given your receiver a code word “apple”:
    
    Hello > 7 4 11 11 14 Apple > 0 15 15 11 4
    
    Adding the code word to the secret message, you’d get:
    
    7 19 0 22 18 > H T A W S
    
    Then your message could be something like:
    
    How are you doing? Today, I went to the store. Avocados were on sale. When do you want to meet up? Saturday looks good for me.
    
    There are definitely way better methods to do the encoding part, and probably also better ways of doing the concealment part.
    
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- nondescripthandle@lemmy.dbzer0.com ⁨1⁩ ⁨week⁩ ago
  Its not too hard to set up most modern trancievers for digital modes, I think the harder part would be making the mode itself.
  
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