Category Archives: CTF

BSides Raleigh 2017 CTF Write-Ups

Taking some inspiration from my friend, Ray, I decided I’d write up some of the solutions to the various challenges I saw at this year’s BSides Raleigh CTF (capture-the-flag) events.ย  And this time, I actually remembered to save some notes and screenshots!

This isn’t a record of every single challenge I saw, just a few that I thought were particularly interesting or noteworthy.


This was a simple one…which I like, because I suck at CTF crypto challenges.ย  The page was just these emoji spread out:

๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜‘๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜‘ ๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜‘ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜‘ ๐Ÿ˜‘๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜‘ ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜‘ ๐Ÿ˜‘๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜‘ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜‘ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜‘ ๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜‘ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜‘ ๐Ÿ˜ฎ๐Ÿ˜‘ ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜‘ ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜‘ ๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜‘๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜‘ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜‘ ๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜‘๐Ÿ˜ฎ๐Ÿ˜‘๐Ÿ˜ฎ ๐Ÿ˜ฎ๐Ÿ˜‘ ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ ๐Ÿ˜ฎ ๐Ÿ˜‘๐Ÿ˜ฎ๐Ÿ˜ฎ

So I noticed right off the bat that there were only two emoji being used:ย ๐Ÿ˜ฎย andย ๐Ÿ˜‘.ย  My initial thought was maybe this was something in binary, but I was dissuaded from that because of the variable lengths of emoji strings.

The next thought was Morse code!ย  So I copied the emojis into Sublime, did a find/replace for each character, to get this:

.. ..-. -.– — ..- -.-. .- -. .-. . .- -.. – …. .. … – …. . ..-. .-.. .- –. .. … – …. …– .- -. -. .. …- . .-. … ….- .-. -.– ..- .–. -.-. .- … . -..

Running that through a Morse code translatorย yielded the message:


So naturally, the flag was TH3ANNIVERS4RY.

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