See here : [https://berryberry.hatenablog.jp/](https://berryberry.hatenablog.jp/entry/2022/03/07/230635)First of all, I got a file "Message.wav".## SolutionOpen with audacity. Then, display spectrogram and set the sampling frequency to 22050 Hz. Now, we can see this image.![](https://cdn-ak.f.st-hatena.com/images/fotolife/B/Berrys/20220307/20220307230327.png)I thought the message was "we need infoce me", however this was incrrect. This was unnatural, but also read as natural. I took some mistakes for submitting flag. Finally, I understand what message below is.```CTF{WE-NEED-INFORCEMENTS}```