The string found at the bottom of the image (after fixing the height) is often encoded in Base64 or ROT13 . 5. Flag Extraction Decoding the discovered string reveals the flag format:
Use the StegSolve.jar tool to browse through different color planes.
The challenge relies on steganography or a hidden IDAT chunk tweak. 17199 d3j4.rar
XCTF{d3j4_vu_st3g0_m4st3r} (or similar depending on the event year).
Extract the contents of the RAR archive and find the hidden flag. 1. Extraction and Initial Analysis The string found at the bottom of the
Scan the QR code revealed in the bit planes. It often leads to a link or a Base64 string. Path B: Use zsteg to find hidden strings in the LSB. zsteg -a d3j4.png Use code with caution.
Upon opening the image, it appears to be a standard picture (often a "Deja Vu" meme or a scenic shot). Tool: Use file or binwalk to check for hidden data. binwalk d3j4.png Use code with caution. The challenge relies on steganography or a hidden
Saving and reopening the image reveals a hidden string or a URL at the very bottom of the extended canvas. 4. Decoding the Final Payload Depending on the specific version of this challenge: