csictf 2020

CTF Writeup - https://ctftime.org/event/1081

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22 July 2020

In Your Eyes

by vishalananth

‘I talk of wondrous things I see, You picture purely out of imagination, You wonder how your light is spent, Days seem bright but you don’t know for sure. I stand in your place and close my eyes, What do I see? (Open your windows to see the secret message)’


Probably the hardest challenge in this CTF because of how clueless I was after every Steganography tool I had failed in finding any useful information. Thankfully we got a clue towards the end of the CTF where it was mentioned that we should use a windows tool to find the data from the image. So after trying all these Windows tools

Blind Side
SteganographX Plus
BMP Secrets
Hexa Stego BMP

I ended up getting something useful when using a tool called QuickStego.

alt text

So, now we have a hex string 2471491ED07C69930E8F994E383E415F. Converting this to binary we get:


Reading the question we can see that one of the two people is blind, So decoding using braille at http://tyleregeto.com/article/braille-6bit-binary-language we get the flag.


tags: Forensics