DecoyBox 🔒

Same-extension file sealing with believable decoys, host-locking, optional passwords, and one-click UX.

Files open normally on your device. On other devices they open a decoy, show a popup, or block — your choice.

✨ Features

• 🖱️ Two-click GUI (Seal / Open / Settings)
• 🧠 Host-locked keys (device ID + local master key)
• 🛡️ Argon2id KDF + AES-GCM with AAD (binds filename/size/ctime)
• 🔏 Tamper-evident header MAC — edited files auto switch to foreign behavior
• 🔐 Optional per-file password on top of device lock
• 🧪 Decoys that look real for PDF/PNG/JPG/TXT/CSV/JSON (generic fallback for others)
• 🧰 Same extension output (e.g., report.pdf stays .pdf) using polyglot layout
• 🗝️ Master key import/export (authorize a second device if desired)
• ⚙️ Foreign behavior policy per file: decoy | popup (custom text) | block

⚠️ Executables (.exe/.dll/.msi/.sys/.com/.bat/.cmd/.ps1) should be sealed as containers (via the app’s Open→Seal flow) — not same-extension — to avoid Windows loader errors.

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🚀 Quick start

1) Install

python -m pip install --upgrade pip
pip install cryptography reportlab pillow argon2-cffi