HideToSee

Author: Sunday Jacob Nwanyim | 100 points

Description

How about some hide and seek heh?

Look at this image here.

Solution

For this challenge we are given a JPEG image file:

atbash.jpg

It appears to be a substitution cipher. However, we don't have any cipher text to use it.

We can use a number a stenography tools to investigate the file for embedded files. Here is a list of tools that I find useful during CTFs.

After trying my go-to stego tools binwalk, strings, exiftool, and foremost, I tried using steghide without a passphrase and got a result.

┌──(kali㉿kali)-[~/Desktop]
└─$ steghide extract -sf atbash.jpg 
Enter passphrase: 
wrote extracted data to "encrypted.txt".
                                                                                                                 
┌──(kali㉿kali)-[~/Desktop]
└─$ cat encrypted.txt 

Flag

The flag found in the steghide file is krxlXGU{zgyzhs_xizxp_7142uwv9}