Audio Problems

Challenge

We intercepted this audio signal, it sounds like there could be something hidden in it. Can you take a look and see if you can find anything?

Solution

We open the file in audacity, nothing interesting to hear, but the spectrogram looks interesting, we clean it up using following settings to get the flag from spectorgram

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scale: linear
algorithm: Frequencies
window size: 2048
window type: Hanning

Flag