Rap Goad
Solved by : Sridevi
Description
My rapper friend Big Y sent me his latest track but something sounded a little off about it. Help me find out if he was trying to tell me something with it. Submit your answer as tjctf{message}
Solution
Open the given mp3 file using Sonic Visualiser. Using Spectrogram we see something like this.
They are encoded images, but not clear. Let's examine the channel-2 in Spectrogram. Now, the encoded symbols are clear.
After surfing through internet I came across this website which decodes similar images as in our case. Let's try decoding using this website.
tjctf{quicksonic}
We got the flag!