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.

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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.

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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)

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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).

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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.

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Example

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

Encryption key: 123

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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.