Signals

Some amateur radio hackers captured a strange signal from space. A first analysis indicates similarities with signals transmitted by the ISS. Can you decode the signal and get the information?

given a Signal.wav file.

Solution

This WriteUp Solution is password protected by the flag of the challenge.

Flag:

For extracting contents from .wav file we use SSTV which can be downloaded from this blog

open pavucontrol and qsstv In pavucontrol 'Recording' tab select "Monitor of Null output" and go to another tab and run following to play the wav file paplay -d virtual-cable Signal.wav and see the output in qsstv which will be something like this

And you will see flag HTB{5l0w-5c4n_73l3v1510n_h4m_r4d10_h4ck3r}