- Published on
San Diego CTF 2024 - Forensic Write Up
- Authors
- Name
- Serikat Newbie Indonesia
- Default Post Author
San Diego CTF 2024 - Forensic Write Up
Watch the Waves 1
from the given image, and the hint given by the chall. i think it has something to do with 'WAV'. So what first come to my mind is that the image is a wav file that is converted. So i write a simple script that turned the image into WAV by parsing its pixel value
The result is a wav file with a voice recording of the flag in NATO Phonetic Code
sdctf{l3tsg02th3b34ch}
Watch the Waves 2
still on the same topic, but the hint says to scan slowly. i try to convert the png using the same script and got wav that sounds something i familiar with.
with the given hint from the chall description and sound that i familiar with, i notices that it was SSTV recording (Slow-scan television (SSTV), https://en.wikipedia.org/wiki/Slow-scan_television)
so i use SSTV decoder to decode it (i use this https://github.com/colaclanth/sstv)
sdctf{KK6UC_wuz-h3r3}