Diophantine

Local desktop app for file encryption and decryption using existing, audited tools.

Diophantine is a Python/Tkinter GUI that orchestrates:

• 7z for ZIP/7z encryption
• gpg for symmetric GPG encryption
• veracrypt for encrypted containers

No cloud services, no accounts, no telemetry.

Screenshot

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Features

• Encrypt with ZIP (AES-256), 7z (AES-256 + header encryption), GPG symmetric (AES-256), VeraCrypt container
• Decrypt with auto type detection (.zip, .7z, .gpg/.pgp/.asc, .hc/.tc)
• Batch operations and drag-and-drop support
• Password generator and entropy meter
• Optional advanced auth modes: recovery phrase, keyfile, keyfile + password
• Profiles for saving encryption settings
• Light/dark support on macOS and themed cross-platform UI

Requirements

• Python 3.10+
• tkinter (usually included with Python desktop installs)
• Python package:
  • tkinterdnd2>=0.3.0

System tools:

• Required for core archive encryption/decryption: 7z or 7zz
• Optional: gpg
• Optional: veracrypt

Install

git clone https://github.com/tsevis/diophantine.git
cd diophantine
pip install -r requirements.txt

Tool installation examples

macOS (Homebrew):

brew install p7zip
brew install gnupg
# veracrypt installed manually from veracrypt.fr

Ubuntu/Debian:

sudo apt update
sudo apt install p7zip-full gnupg python3-tk

Fedora:

sudo dnf install p7zip p7zip-plugins gnupg2 python3-tkinter

Run

cd src
python main.py

Quick Usage

1. Open Encrypt tab.
2. Add files/folders.
3. Choose method and naming scheme.
4. Enter password (or advanced auth mode).
5. Encrypt to output folder.

For decryption:

1. Open Decrypt tab.
2. Add encrypted files.
3. Confirm/override detected type.
4. Enter matching auth input.
5. Decrypt to output folder.

Full user guide: MANUAL.md

Security Notes

• Diophantine does not implement custom crypto; it shells out to external tools.
• Security depends on endpoint integrity and password strength.
• Keep 7z/gpg/veracrypt updated.
• Verify encrypted output before deleting plaintext originals.

Additional docs:

• docs/SECURITY.md
• docs/THREAT_MODEL.md
• docs/PHILOSOPHY.md

License

MIT (see LICENSE).