This is part of my write up from the Hackfu 2015 Security Challenge..
The second challenge I solved was in fact quite easy because I solved a similar one for the SANS Summer challenge in 2014 (where it took me much longer to solve the first time I came across this type of steganography!)
The instructions given were:
Below is how I solved that challenge:
But, If you load the file in a windows software such as Sonic Visualizer, add a layer to show a Spectrogram ...
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