Information#
Version#
| By | Version | Comment |
|---|---|---|
| noraj | 1.0 | Creation |
CTF#
- Name : RCTF 2017
- Website : ctf.teamrois.cn/
- Type : Online
- Format : Jeopardy
- CTF Time : link
Description#
I'm so into you I can barely breath.And all I wanna do is to fall in deep
For this challenge we have a wav file Ariana Grande - Into You (Samurah & DVZE Remix).wav. I didn't listen to it so I can't tell you how the music feels but I can tell you this must be a steganography challenge.
So using Audacity to visualize the file, I switched from Waveform to Spectrogram. There I went to the end of the file an see something unusual: there is a blank cut and then something that doesn't look like music.
Let's zoom.
We are able to read somethind ending with _wav, this must be part of the flag.
Now let's change some spectrogram settings.
- Scale:
Linear=>Mel - Maximum frequency:
8000 Hz=>22050 Hz - Window size:
256=>2048 - Check
Show the spectrum using grayscale colors
This is much readable now:
Flag is: RCTF{bmp_file_in_wav}.