[CTF] WU - Hidden message
CTF InterCampus Ynov 2024
Difficulty Level : Very Easy
Challenge Category : Stegano
Description :
A simple image? Perhaps. But sometimes the answers aren't visible to the naked eye. Explore this image and see if you can reveal its secret.
Solution Steps
Step 1: Analyze the Image
Begin by inspecting the provided challenge.jpg file. Look for clues, such as:
- File metadata (EXIF data).
- Potential hidden messages or embedded files.
Commands to Use:
file challenge.jpg
exiftool challenge.jpg
If nothing obvious is found, proceed with stegano tools like steghide.
Step 2: Attempt Steghide Extraction
The hint mentions using steghide to extract hidden content from the image.
Command:
steghide extract -sf challenge.jpg
Result:
If a password is required, it will prompt you for one.
Step 3: Try a Simple Password
Given the challenge description, the password is likely related to the Ynov CTF. Try using ynov as the password.
Command:
steghide extract -sf challenge.jpg -p "ynov"
Expected Output:
Steghide successfully extracts the hidden content, which contains the flag or next clue.
Step 4: Read the Extracted File
After successful extraction, a new file (e.g., flag.txt) will appear in the directory.
Command:
cat flag.txt
