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Locked How To Hide Messages In Audio Files


dEEpEst

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How can we see an audio ? Usually, by its waveform, but we can also see the visual representation of its frequency over time, which is a spectrogram.

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Since every audio can be represented by a visual way, can we construct an audio file from an image, that will be reproduced as its spectrogram ? Yes, we can.

For Windows, I recommend to use the software Coagula Light to do it, which has a graphic interface, so you probably won't have problems: 
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If you are using a Linux distribution, just as me, you may use a perl script called imageSpectrogram, which you can get by git clone:

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And you will also need two Perl CPAN dependencies:
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If you have problems trying to get GD, make sure that you have libgd2-xpm-dev:

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And try again.

Now you are able to generate the audio file just by running:

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To make sure that everything will run right, use black and white image with its extension in the name (.png, .jpeg...)

Check the steps in practice below:

Choose the image




	
		
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Make sure you have the script
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Run it and then you get the audio
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As it was expected, the sound is kinda weird.

Done
You did it, but at least, we can check it by opening it in Audacity:

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This is showing us its waveform, but if we change to spectrogram by clicking right on the bar with the file's name, we can see:

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Also, you can combine this with other methods, from now it's all up to you.

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