Virtual Machine 0
100 points
AUTHOR: LT 'SYREAL' JONES
Description
Can you crack this black box?
We grabbed this design doc from enemy servers: [Download]. We know that the rotation of the red axle is input and the rotation of the blue axle is output. The following input gives the flag as output: [Download].
I searched google what the heck is a .dae file is, and its a file for models and can be opened in blender.
Opening the model in blender we get a lego construction with 2 wheels:
- Blue - 8 teeth
- Red - 40 teeth
We're told that the input is the number of times we turned the red wheel and the output is the number of times we turned the blue wheel.
Turing the red wheel once rotates the blue wheel 5 times so that's their relationship (idea from the hint), so if we just multiply the input by 5 we get the output which is a number that's supposed to be the flag.
There's only one thing to do now and it's to decode it to bytes:
from Crypto.Util.number import long_to_bytes
n = 39722847074734820757600524178581224432297292490103995908738058203639164185
print(long_to_bytes(n*5))
And we get the flag:
picoCTF{your flag}
Top comments (5)
im dead the flag is not working 😭
because the flag is diffrente from others you have to change the input u got from downloaded and replace with that one and you will get your flag as well
or check my youtube channel Cyberdemo
You should change to your input the one they gave you and then after replacing it run the python script you should see your flag there.
dude please stop flooding
Why?