$ cat writeup.md…
$ cat writeup.md…
hackthebox
Task: an SDR modem exposed only via two ZMQ endpoints with no client handout; modulate CCSDS telecommands and demodulate telemetry to drive a BEGIN->ACK->GETFLAG exchange. Solution: recognize the reference 'stereo' WAV is really complex I/Q baseband FSK, implement complex CPFSK mod/demod, build CCSDS TC frames, and uplink both frames as one byte-aligned, phase-continuous stream.
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