Salaheldin

March 14, 2019

de Bruijn Sequences

Main Challenge @ The 2018 SANS Holiday Hack Challenge [ Kringlecon ]

CTF Writeup

๐Ÿ“ Speaker Unpreparedness Room in 2nd floor go right in the hole


solution-icon.png

1- Letโ€™s take a look at the door:

6-lock-1.jpg

2- Use provided de Bruijn Sequence online generator to know guesses for the door key :

6-lock-2.jpg

  • You can see results under Sequence title

6-lock-3.jpg

3- Now go to door lock and start with numbers from the sequence beginning until you find the correct pin for the door lock .

4- The correct PIN is 0 1 2 0

5- Now enter the room and click on Morcel Nougat to see what he is saying :

6-lock-4.jpg


๐Ÿ“Ÿ Go to your Badge > Objectives > Enter Welcome unprepared speaker!