I have a key with a curious code etched into it but not a clue where it goes. Here, take a look and let me know if you discover anything even the least bit significant about it.
First thing i did was to just read over the description of the challenge again.
This lead to me thinking that it had to do something with the least significant bit.
I then used a tool called zsteg with the parameter of -A to search for every method inside of the picture.
To install zsteg you will need to use the following: gem install zsteg
Tool is fro: https://github.com/zed-0xff/zsteg
After running zsteg it prints out alot of information in the terminal with the important information being red.
The following caught my eye as base64:
TW9Xb01vR2xEaVVxVmtYVVVlfnpUfn5+VmV+a09ufn5WZX5+Tm1EfklvU3c=
It then decodes to the following
MoWoMoGlDiUqVkXUUe~zT~~~Ve~kOn~~Ve~~NmD~IoSw
This made no sense to me for awhile so i had to do some research and understand what this code meant and how did it relate to the picture.
The picture is of a key with 21A on it.
I tried the vigenere cipher since it needs a key input but that did not work.
After plenty of googling and seraching up common stego tech for ctfs i found the answer.
The key was XOR is a bitwise operator takes in a passcode of numbers and letters.
I found XOR in cyber chef and got the flag.
Flag = leveleffect{way_to_put_two_and_two_together}