Steganography Tool 🔒

Overview

This project is a steganography tool implemented in C++, designed to hide messages within image files while providing multiple levels of encryption.
It supports PNG, BMP, and PPM formats, allowing users to embed data by modifying the least significant bits (LSB) of pixel values.

The tool offers different encryption levels, giving users control over how much data can be stored and how detectable the modifications are.

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Features 🚀

This C++-based steganography tool provides a powerful and flexible way to hide and extract secret messages from images while supporting multiple encryption levels.
The project is structured into various modules, including command handlers, encryption algorithms, exception handling, and image processing.

🔹 Multiple Encryption Levels

• 1-bit encryption:

  • Modifies the least significant bit (LSB) of the blue channel.
  • Low visibility, making detection difficult.

• 2-bit encryption:

  • Uses 1 bit from the blue channel and 1 bit from another channel (red or green).
  • Balances data capacity and image integrity.

• 4-bit encryption:

  • Modifies 4 least significant bits across different color channels.
  • Maximizes message size but slightly alters the image appearance.

🔹 Image Processing Capabilities

• Efficient pixel manipulation with PixelColor.h for direct access to image data.
• Dedicated handlers for different formats:
  • BmpImageStuff.h (BMP)
  • PngImageStuff.h (PNG)
  • PpmImageStuff.h (PPM)
• Preserves original image quality as much as possible.

🔹 Modular and Extensible Architecture

• BaseEncryptor.h provides an abstraction layer for different encryption methods.
• OneBitEncryptor.h, TwoBitEncryptor.h, and FourBitEncryptor.h allow flexible encryption strategies.
• Easily extendable for new encryption techniques.

🔹 Command Handlers for User Interaction

• EncryptCommandHandler.h - Processes encryption requests.
• DecryptCommandHandler.h - Extracts hidden messages from stego-images.
• CheckFileSizeCommandHandler.h - Ensures enough space is available in the image.
• FileInfoCommandHandler.h - Provides metadata and file details.
• HelpCommandHandler.h - Displays available commands.

🔹 Exception Handling for Robustness

• argument_count_exception.h ensures correct argument validation.
• Built-in error detection to prevent incorrect operations.

🔹 CLI-Based Interface

• Users can encrypt and decrypt messages directly from the command line.
• Simple syntax for encoding and decoding operations.

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Example of Usage

1. Build the project.
2. Ensure that cmake-build-debug exists.
3. Navigate to the build directory (cd cmake-build-debug).
4. Run ./Steganography -h to see the available commands.

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Programming Language

• C++ (Functionality and logic)

Development Environment

• IntelliJ CLion

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Project Structure

• 2324_16_s31722_ZJM/commandHandlers - General commandHandlers for program
• 2324_16_s31722_ZJM/encryptors/ - Providing main logic of encrypting your images
• 2324_16_s31722_ZJM/exceptions/ - Providing instructions about exceptions
• 2324_16_s31722_ZJM/Image/ - general format stuff(headers)
• 2324_16_s31722_ZJM/ImagesToTesting - Directory containing all images to test
• README.md - Project documentation
• LICENSE - Project license

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License

This project is licensed under the MIT License