Writeup – Beatz For Dayz (TUCTF)

This one’s a short but sweet writeup for future reference: this 100-point (?) challenge came in the form of a FLAC audio file. We threw around some ideas for a bit, and then someone hit upon the realization that we could simply open the file in Audacity and take a look around. Sure enough, there was a noticeable spike:

what's that?

what’s that?

A little bit of zooming in later:

mother fucker...

mother fucker…

After trying to convert this into some manner of binary string, it dawned upon us that this was frequency-modulated morse code. 5-minutes later, and we had the flag: “morse_is_fun”.

Well played, TUCTF, well played.

About Norman

Sometimes, I write code. Occasionally, it even works.
This entry was posted in Bards, Computers, Jesting and tagged , . Bookmark the permalink.

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