A production-ready FastAPI steganography server with hybrid encryption built on python-template-server. Hide encrypted messages in images using LSB or DCT algorithms with comprehensive API security.

• Features
  • Steganography Capabilities
  • Security Features
• Quick Start
  • Installation
  • Configuration
  • Managing the Container
• License

Dual Algorithm Support:

• LSB (Least Significant Bit): High capacity, fast encoding/decoding, ideal for lossless formats (PNG)
• DCT (Discrete Cosine Transform): JPEG-compression resistant, robust to image transformations

Operations:

• Encode: Hide encrypted messages in images with base64 input/output
• Decode: Extract and decrypt hidden messages from images
• Capacity Check: Calculate maximum message size for any image

Flexible Image Handling:

• Supports multiple formats
• Base64 encoding for API transmission
• Configurable output formats
• Maintains image dimensions and quality

Hybrid Encryption Architecture:

• RSA-2048: Asymmetric encryption for secure key exchange
• AES-256-CFB: Symmetric encryption for message data
• Random IV: Unique initialization vector for each operation
• Multi-Channel Embedding: Data distributed across RGB channels

Download the latest release from GitHub Releases.

Rename .env.example to .env and edit it to configure the server.

• HOST: Server host address (default: localhost)
• PORT: Server port (default: 443)
• API_TOKEN_HASH: Leave blank to auto-generate on first run, or provide your own token hash

# Start the container
docker compose up -d

# Stop the container
docker compose down

# Update to the latest version
docker compose pull && docker compose up -d

# View the logs
docker compose logs -f python-steganographer

Note: You may need to add your user to the Docker group and log out/in for permission changes to take effect:

sudo usermod -aG docker ${USER}

This project is licensed under the MIT License - see the LICENSE file for details.