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Prodigy_CS_02

Image Encryption and Decryption Tool

A Python-based tool for simple image encryption and decryption using the XOR operation. This script allows you to securely encrypt an image file using a user-defined key and later decrypt it using the same key.

Features

  • Encrypt and decrypt image files using XOR operations.
  • Supports color images in RGB format.
  • Easy-to-use interactive command-line interface.
  • Ensures that the original image can be fully restored using the same key.

Prerequisites

Before running the script, ensure you have the following installed:

  • Python 3.6 or later
  • Pillow library (pip install pillow)
  • NumPy library (pip install numpy)

Usage

  1. Clone this repository: 
    git clone https://github.com/yourusername/image-encryption-tool.git
  2. Navigate to the project directory: 
    cd image-encryption-tool
  3. Run the script: 
    python encrypt_decrypt_image.py
  4. Follow the prompts:
    • Provide the path to the input image.
    • Specify the output path for the encrypted/decrypted image.
    • Enter an encryption key (integer between 0 and 255).

How It Works

  1. Encryption/Decryption:

    • The script applies the XOR operation (^) between the image pixel values and the encryption key.
    • The same key can be used to decrypt the encrypted image back to its original form.

  2. Key Restrictions:

    • The encryption key must be an integer between 0 and 255 to ensure compatibility with RGB pixel values.

  3. Image Support:

    • Supports any image format that can be opened by the Pillow library and converts it to RGB.

Example

Input Image: input_image.jpg
Output (Encrypted): encrypted_image.jpg
Output (Decrypted): decrypted_image.jpg

Encryption key: 123

Error Handling

The script includes basic error handling for:

  • Invalid file paths.
  • Unsupported file formats.
  • Out-of-range or invalid encryption keys.

Contributions

Contributions are welcome! If you encounter issues or have ideas for improvement, feel free to open an issue or submit a pull request.