$ cat writeup.md…
$ cat writeup.md…
hackthebox
Task: a 0.2s WAV holding a raw AFSK1200 (Bell 202) transmission with no AX.25/HDLC framing. Solution: identify mark/space tones via zero-crossing frequency analysis, then write a non-coherent I/Q correlation FSK demodulator in numpy that samples symbol centers and packs raw bits MSB-first to recover the ASCII flag.
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