# CrossCTF_2017: Sky Pillar 4

Category: Reverse Engineering Points: 300 Description:

192.168.0.31:1350 Please start from level 01

## Write-up

This one was the pinnacle of my reverse engineering skill. With a little luck, you would guess that this is related to Fibonacci numbers, unfortunately, I did not in time for competition, so I just transpiled everything into solve.c.

$gcc solve.c && ./a.out Currently on 584 Found! 584$ ./skypillar
Welcome to
______     __  __     __  __        ______   __     __         __         ______     ______
/\  ___\   /\ \/ /    /\ \_\ \      /\  == \ /\ \   /\ \       /\ \       /\  __ \   /\  == \
\ \___  \  \ \  _"-.  \ \____ \     \ \  _-/ \ \ \  \ \ \____  \ \ \____  \ \  __ \  \ \  __<
\/\_____\  \ \_\ \_\  \/\_____\     \ \_\    \ \_\  \ \_____\  \ \_____\  \ \_\ \_\  \ \_\ \_\
\/_____/   \/_/\/_/   \/_____/      \/_/     \/_/   \/_____/   \/_____/   \/_/\/_/   \/_/ /_/
================================================================================
Home of the legendary Pokemon, Rayquaza
================================================================================
There are 5 Levels to climb. Each level requires a specifc code to unlock the next level.
Your goal is to reach the top, and catch the legendary Rayquaza... Good luck!
====================================================================
LEVEL 01
====================================================================
Enter code: I [email protected]@ be the very best
CrossCTF{xxxxxxxxxxxxxxxxx}
====================================================================
LEVEL 03
====================================================================
Enter Code: 0 @ C D G
CrossCTF{xxxxxxxxxxxxxxxxx}
====================================================================
LEVEL 04
====================================================================
Enter Code: 584
CrossCTF{xxxxxxxxxxxxxxxxx}


Therefore, the flag is .