17199 D3j4.rar -

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.

By toggling through the bit planes (specifically Red Plane 0 , Green Plane 0 , or Blue Plane 0 ), a distorted or faint QR code becomes visible in the top-left corner. 3. Fixing the Image Dimensions (The "Deja Vu" Trick)

The challenge relies on steganography or a hidden IDAT chunk tweak. 17199 d3j4.rar

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.

Extract the contents of the RAR archive and find the hidden flag. 1. Extraction and Initial Analysis Scan the QR code revealed in the bit planes

Locate the 4-byte height value and increase it (e.g., from 00 00 02 00 to 00 00 04 00 ).

Use the StegSolve.jar tool to browse through different color planes. zsteg -a d3j4

XCTF{d3j4_vu_st3g0_m4st3r} (or similar depending on the event year).