ctf-writeup/DefCamp Capture the Flag (D-CTF) 2023 Quals/morse-music

morse-music

You might need to cross listen the message within the morse code.

About the Challenge

We were given a wav file (You can download the file here), and we need to find the flag inside the file

How to Solve?

If we decode the morse code, we got this message

Did you know that this is not about the morse code? It is about the spectogram only that the password is UHR3V8203RJD

And if we check the spectogram of the file, there is a QR code

Parse the QR code and we got this string

Njw0SGcLVwJVZ358MC0xBmUMClMKanlzZSpnAjVeBgVRMX0lYyliA2RaB1UDY3ghMHw0UGUPAQAHNysnNClmAjMPA1VO

Decode it using base64 encoding and then XOR the result with UHR3V8203RJD to obtain the flag

ctf{13e2f548eec5348c98370b51cf45bc7a6a002b5e012ee4fc37304eacaa41e71e}