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HideToSee

  • Description: How about some hide and seek heh?
  • Difficulty: Medium

🔎 Solution​

The challenge provides an image hinting at the Atbash Cipher - a classic substitution cipher where each letter is replaced by its counterpart in the reversed alphabet (A ↔ Z, B ↔ Y,...).

Using steghide to inspect the image for hidden content, with an empty passphrase

> steghide extract -sf atbash.jpg
Enter passphrase: 
wrote extracted data to "encrypted.txt".

We successfully extract a hidden string:

krxlXGU{zgyzhs_xizxp_xz00558y}

Applying Atbash decryption tool to this string reveals the final flag.

🚩Flag​

picoCTF{atbash_crack_ca00558b}