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Third Eye

Challenge:

This beat is making me see things that I didn't think I could see...

third_eye.mp3: https://drive.google.com/file/d/13Je41zqYscApr-f6GJ5kC8RjeRP6hjUi/view?usp=sharing

Solution:

The audio file sounds normal. We can open it up in Sonic Visualizer to take a closer look.

At first glance, everything looks normal:

Nothing to see here.

But if we add a spectrogram, we can see something that looks out of place:

Or IS there...

With a little adjustment, we can see some hidden hex:

I knew it!

446177674354467b73796e337374683373316163737d

And that decodes to our flag: DawgCTF{syn3sth3s1acs}.