Stegasoo

A secure steganography system for hiding encrypted messages in images using hybrid authentication.

Features

• AES-256-GCM authenticated encryption
• Argon2id memory-hard key derivation (256MB RAM requirement)
• Pseudo-random pixel selection defeats steganalysis
• Multi-factor authentication: Reference photo + passphrase + PIN/RSA key
• Multiple interfaces: CLI, Web UI, REST API
• File embedding: Hide any file type (PDF, ZIP, documents)
• DCT steganography: JPEG-resilient embedding for social media
• Channel keys: Private group communication channels

Embedding Modes

Mode	Capacity (1080p)	JPEG Resilient	Best For
DCT (default)	~150 KB	Yes	Social media, messaging apps
LSB	~750 KB	No	Email, direct file transfer

Web UI

Home	Encode	Decode	Generate

Quick Start

# Install (Python 3.10-3.12)
pip install -e ".[all]"

# Generate credentials
stegasoo generate --pin --words 4

# Encode a message
stegasoo encode \
  --ref my_photo.jpg \
  --carrier meme.jpg \
  --passphrase "apple forest thunder mountain" \
  --pin 123456 \
  --message "Secret message"

# Decode
stegasoo decode \
  --ref my_photo.jpg \
  --stego stego_image.png \
  --passphrase "apple forest thunder mountain" \
  --pin 123456

Interfaces

Interface	Start Command	Documentation
CLI	stegasoo --help	CLI.md
Web UI	cd frontends/web && python app.py	WEB_UI.md
REST API	cd frontends/api && uvicorn main:app	API.md

Security Model

Reference Photo ──┐
(~80-256 bits)    │
                  ├──► Argon2id KDF ──► AES-256-GCM Key
Passphrase ───────┤    (256MB RAM)
(~43-132 bits)    │
                  │
PIN ──────────────┤
(~20-30 bits)     │
                  │
RSA Key ──────────┘
(optional)

Configuration	Entropy	Use Case
4-word passphrase + 6-digit PIN	~153 bits	Standard security
4-word passphrase + PIN + RSA	~280+ bits	Maximum security

Requirements

Requirement	Version
Python	3.10-3.12
RAM	512 MB+

Development

pip install -e ".[dev]"
pytest
black src/ tests/ frontends/
ruff check src/ tests/ frontends/

Docker

# Quick start (HTTPS enabled by default)
docker-compose up -d

# Access
# Web UI:   https://localhost:5000  (self-signed cert)
# REST API: http://localhost:8000

# Disable HTTPS if needed:
STEGASOO_HTTPS_ENABLED=false docker-compose up -d

See DOCKER.md for full documentation.

Raspberry Pi

Pre-built SD card images available for Pi 4/5:

# Flash image (download from GitHub Releases)
zstdcat stegasoo-rpi-*.img.zst | sudo dd of=/dev/sdX bs=4M status=progress

# First boot runs interactive setup wizard:
# - WiFi configuration
# - HTTPS with port 443
# - Channel key generation
# - Optional overclocking

See rpi/README.md for manual installation.

Documentation

• INSTALL.md - Installation guide
• DOCKER.md - Docker deployment
• CLI.md - Command-line reference
• API.md - REST API documentation
• WEB_UI.md - Web interface guide
• SECURITY.md - Security model details
• UNDER_THE_HOOD.md - Technical deep-dive
• CHANGELOG.md - Version history
• CONTRIBUTING.md - Contributor guide
• man stegasoo - Man page (install: sudo cp docs/stegasoo.1 /usr/local/share/man/man1/ && sudo mandb)

License

MIT License - see LICENSE. Use responsibly.

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This tool is for educational and legitimate privacy purposes. Users are responsible for complying with applicable laws.