34C3 Junior CTF - information_society
The challenge consisted of an audio file
Upon listening to the sound file it became clear, that it had to be a modem sound, so a program to reverse the data into its original form was required. Intro minimodem. It can be installed in Kali via:
apt-get install minimodem
The hints from the hidden track proved quite invaluable as 8 data bits and 300 baud were the same values required to resemble this audio file.
minimodem --read 300 -a -8 -f information_society_bonustrack.flac > information_society_bonus
The resulting file was:
file information_society_bonus information_society_bonus: PNG image data, 657 x 100, 8-bit/color RGBA, non-interlaced