Invisible Ink

Description

The flag is hidden somewhere in this GIF. You can't see it? Must be written in transparent ink.

Solution

1. Initial Analysis:
   1. Given a GIF file that presumably contains hidden information
   2. The challenge name and description hint at transparency/visibility tricks
   3. "Invisible ink" suggests parts of the image might be hidden or partially visible
2. Using Stegsolve: We used Stegsolve, a popular steganography analysis tool. The first step was analyzing the GIF file to extract individual frames, and we found 2 distinct frames.
3. Frame Analysis: We downloaded both frames separately and used Stegsolve's color manipulation capabilities to enhance visibility. Each frame contained partial letters of the flag, but neither frame alone contained the complete flag.
   
4. Flag Recovery: The key insight was that the flag was split across two frames. We used Stegsolve's frame combiner feature to merge the two frames, revealing the complete flag.
   

Flag

Tools Used

• Stegsolve (Primary tool)
• Frame extraction
• Color plane analysis
• Frame combination