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.

img1

They are encoded images, but not clear. Let's examine the channel-2 in Spectrogram. Now, the encoded symbols are clear.

img2

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!