Solving a Covert-Channel Data Analysis Challenge from an ICS CTF
0x01 Challenge description. 0x02 Detours. This is clearly an MP3 steganography challenge. Three conventional approaches come to mind: open it as text and search for 'flag'; inspect its waveform and spectrogram for Morse code; or check the MP3 for embedded files and extract them. The first idea found nothing. The waveform and spectrogram also contained no useful information…