English [Internetwache CTF 2016] [Reverse 90 – The Cube] Write Up

Description

Description: I really like Rubik’s Cubes, so I created a challenge for you. I put the flag on the white tiles and scrambled the cube. Once you solved the cube, you’ll know my secret.

Resolution

The 3 interested faces were:

White side:
-------
|{|3| |
| |D|R|
| |W| |
-------

Yellow side:
-------
|}| | |
|3| | |
| | | |
-------

Red side:
-------
|I| | |
| | | |
| | |C|
-------

All letters extracted were: {3DRW}3IC

We knew the flag format was :

IW{
???
??}

Remaining letters: 3DR3C

The letter D was at the middle of a face, and will not move after all:

IW{
?D?
??}

Remaining letters: 3R3C

The letter C was in a corner, and there was only one corner still available:

IW{
?D?
C?}

Remaining letters: 3R3

We tried to put the 3 letters in the order:

IW{
3DR
C3}

It worked!

Flag was : IW{3DRC3}

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