BITSCTF 2026 - Writeups

Welcome to my writeup collection for BITSCTF 2026! This repository contains detailed solutions for the challenges I solved during the competition.

📊 Challenge Summary

Challenge Name	Category	Difficulty	Flag	Writeup
Euclidean Construct	OSINT	Medium	BITSCTF{tickles.cheeks.bend}	View Writeup
MArlboro	Steganography / Forensics / Crypto	Hard	BITSCTF{d4mn_y0ur_r34lly_w3n7_7h47_d33p}	View Writeup
Queen Roselia's Diamond	Steganography / Forensics	Hard	bitsctf{qr_bu7_n07_7h47_qr}	View Writeup

🎯 Challenges by Category

OSINT

• Euclidean Construct - Copenhagen fire investigation using What3Words geocoding

Steganography / Forensics

• MArlboro - Multi-layer challenge with XOR decryption and Malbolge execution
• Queen Roselia's Diamond - 64-bit TIFF layer extraction with hidden flag in visual noise

🛠️ Tools Used

• OSINT: Google Maps Street View, What3Words
• Forensics: binwalk, zsteg, exiftool, strings
• Steganography: LSB analysis, byte-layer extraction
• Cryptography: CyberChef (XOR operations)
• Image Processing: Python (NumPy, PIL), GIMP
• Esoteric Languages: Malbolge interpreter

📁 Repository Structure

BITSCTF-2026-Writeups/
├── README.md (this file)
├── Euclidean-Construct-OSINT-README.md
├── Marlbolo-Steganography-README.md
├── Queen-Roselia-Diamond-Steganography-README.md
└── images/
    ├── euclidean-construct/
    ├── marlbolo/
    └── queen-roselia-diamond/

🏆 Stats

• Total Challenges Solved: 3
• Categories: OSINT (1), Steganography/Forensics (2)
• Difficulty Breakdown: Medium (1), Hard (2)

👤 Author

Pranav M
GitHub: @Pranav-m7

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These writeups are for educational purposes. All challenges are from BITSCTF 2026.