Mixed Signals

Steganography Challenge

NOTE: Unfortunately we goofed up and uploaded the wrong file. As it's too late into the CTF to fix, we will be leaving the challenge as-is. Yes, you can just hear the flag in the audio file directly.

I can't figure out what my friend is trying to tell me. They sent me this recording and told me that the important stuff is at 40 kHz (??? what does that even mean).

3MB

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This is my very first challenge that is related to audio steganography, it is really easy just hear the NATO Phonetic Alphabet and translate it into a flag

lactf{c4n_y0u_plz_unm1x_my_s1gn4lz}